LT5 fuel pump?

[limo1988]

I have a 1990 ZR1 and I think I may have a failing fuel pump. What I would like to know: Is there a specific LT5 fuel pump and where can I buy it? Where specifically is the location on the LT5 for the connection for a fuel pressure gauge? Any help would be appreciated...

[Kevin]

buy 2 454 cid chevy suburban pumps.

[secondchance]

Fuel pressure gauge can be hooked up at Schrader valve on the passenger side fuel rail close to the alternator.
Pic was to show how I hooked up a capacitor but shows Schrader valve also.
http://i658.photobucket.com/albums/uu303/byongyun/IMG_0634_zps1bd92667.jpg (http://s658.photobucket.com/user/byongyun/media/IMG_0634_zps1bd92667.jpg.html)

[limo1988]

Kevin, thanks for the reply. Why (2) 454 pumps? The standard 1990 Corvette fuel pump(1) mounts below the gas cap. ?? I just don't know if I should be looking for a special LT5 pump or just buy a standard 1990 pump.

[Kevin]

The zr-1 has two fuel pumps from a 454 suburban. I just did mine. Be ready with some wd40 and steel wool to clean up any rust you find on the assembly. You will have to reuse the...ah crap the name escapes me after work and two beers.

[WVZR-1]

Any 'off the shelf' replacement for the GM part #'d pump 25163473 is considered a 'replacement' equivalent and there are many choices. A search of just "fuel pump" will offer up pages of reading and some is very good reading. There is a primary and secondary pump so you might consider doing the 'pair'.

Here's a thread that's several pages long that mentioned a different replacement with assembly snapshots done by a 'talented' owner. It's a good read:

http://www.zr1.net/forum/showthread.php?t=9778&highlight=fuel+pump+part+number

[ZRXMAX]

The 454 pump is from the 96 Suburban as I recall... I know that is what I put in mine years ago.

As WVZR-1 says ( and he knows ) you will get the replacement parts for a fair price in the end.

[cvette98pacecar]

Kevin, thanks for the reply. Why (2) 454 pumps? The standard 1990 Corvette fuel pump(1) mounts below the gas cap. ?? I just don't know if I should be looking for a special LT5 pump or just buy a standard 1990 pump.

If your unit holds one pump you will need to buy the correct fuel pump assemble for two pumps.

[Hog]

Just so you guys know, the 1996- EP381 (25163473) is used on the Vortec 4.3 V6, the Vortec 305(L30), 250 (L31) and Vortec 454(L29). $70 from Rock Auto, sock not included.
The stock fuel pressure on the V6 and 305/350 is 63-66psi, and the pump will push 100psi if deadheaded.
These pumps are called for my Chev Performance Parts for the 502hp Ramjet 502, 4the all aluminum 493hp Ramjet Zl1 and 350hp Ramjet 350 crate engines.

You should have plenty of fuel for the highest output of LT5's.

[cvette98pacecar]

Just so you guys know, the 1996- EP381 (25163473) is used on the Vortec 4.3 V6, the Vortec 305(L30), 250 (L31) and Vortec 454(L29). $70 from Rock Auto, sock not included.
The stock fuel pressure on the V6 and 305/350 is 63-66psi, and the pump will push 100psi if deadheaded.
These pumps are called for my Chev Performance Parts for the 502hp Ramjet 502, 4the all aluminum 493hp Ramjet Zl1 and 350hp Ramjet 350 crate engines.

You should have plenty of fuel for the highest output of LT5's.

What is the flow rate on a stock pump. I was looking at some aftermarket pumps last night that flow up to 350 Lph.

[Hog]

What is the flow rate on a stock pump. I was looking at some aftermarket pumps last night that flow up to 350 Lph.

I cant find the data right now on the Vortec pumps and I cant accurately remember. When I find it I'll post back.

The least expensive pump(Edit least expensive high flow aftermarket pump) that I have found is this Racetronix pump for $100. Ive got a few American friends that use these.

Picture
http://i1202.photobucket.com/albums/bb373/Paul_Schermerhorn/RXP340-1_zps5d3e85e7.jpg (http://s1202.photobucket.com/user/Paul_Schermerhorn/media/RXP340-1_zps5d3e85e7.jpg.html)


Specs here.
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
FEATURES:

Flows 340 Liter/Hr (90 US GPH) @ 43 PSI @ 13.5V *
In-tank use only / submersible design
Reliable and quiet turbine impeller
Can be used with EFI or carbureted applications
May be used in pulse modulated systems (PWM)
Center-inlet design. Same fitment as Walbro GSS340M, GSS307M and GSS294M pumps.
Each pump individually tested
For gasoline (use with E85 will reduce life expectancy)
Integral check-valve
Over-pressure safety bypass valve

MECHANICAL SPECS:

Weight: 355 grams / 0.783 lbs
Diameter: 38mm / 1.54" O.D.
Body: Black-plated steel with laser etching
Inlet: 22mm / 0.866" OD (non-tapered)
Outlet: 8mm / 0.315" (with barb)
PRV Activation: 90PSI nominal
Impeller design: Single-scroll hard-anodized aluminum turbine

ELECTRICAL SPECS:

Recommended operating voltage: 13.5 volts DC
Minimum operating voltage: 6 volts DC
Max operating voltage: 18 volts DC
Current draw @ 43.5PSI: 12 amps (13.5VDC)
Current draw @ 58.0PSI: 14 amps (13.5VDC)
Current draw @ 80.0PSI: 17 amps (13.5VDC)

NOTES:
REQUIRES UPGRADED IN-TANK AND EXTERNAL WIRING FOR PROPER OPERATION.

THIS PUMP IS SOLD WITHOUT ANY WIRING, FILTERS OR MOUNTS. SELECT THE PARTS YOU REQUIRE IN OUR WEB STORE BASED ON YOUR APPLICATION
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxx


340 lph at 43.5 psi, not bad for $100, so slightly less for the ZR-1's working fuel pressure of 50.75 psi(350kpa), which will read lower with the engine running as the FPR is vacuum referenced.. I just wonder at what point the stock lines and/or FPR's will become overworked.

Anyone have a flow rate for the primary and secondary pumps of the ZR-1?

[WVZR-1]

The 'challenge' with that particular Racetronix pump might be the 38mm diameter and the fit into the sleeves of the ZR-1 sender sleeves. That pump has a similar vane type drive advertised by Bosch for the pump that Andrew had to modify the sleeves on to get a fit. I believe that when these pumps are spec'd they're intentioned for the vertical sending unit that has no diameter restrictions regarding the mount. It might be interesting if someone has an old tank unit and they could measure the ID of the sleeves. The only one I have is new and assembled and I can't get a vernier caliper in there to accurately say yes or no but it looks like it could be a challenge.

You can't assume any longer that Delphi implies GM or NOT and they might very well do a GM pump to different specs but the Delphi pump replacement for the GM 25163473 (FE0114) is spec'd at 425 kPa (61.64 PSI) application pressure and 500 - 750 kPa (72.5 - 108.7 PSI) relief pressure. The only flow rate mentioned is 27 with no mention of unit of measure. It's also maybe a little 'chubby' at 36.7mm. It's applications are all for the vertical standing senders also.

[Kevin]

Interesting ideas here guys but the 454 pumps are direct replacements and only about $160 for the set

[cvette98pacecar]

Here is a link for the Bosch pump and gasket.

Part Number Description Comments
68238 Fuel Pump Tank Seal
68001 Fuel Pump Strainer
69223 Electric Fuel Pump In-Tank

http://www.boschautoparts.com/VehiclePartFinder/Pages/VehiclePartFinder.aspx

[dondon]

I used 2 performance electric p240kc pumps... Got the info from members of this site, they work well for my 90.

http://www.rockauto.com/dbphp/x,catalog,166,partnum,P240KC,d,PERFORMANCE_ELECTRI C_P240KC.html

They used to be $23... Looks like they are down to $20.79 each.

[cvette98pacecar]

Compute your engine's fuel consumption at wide-open-throttle (WOT) as approximately equal to HORSEPOWER/10 = Gallons Per Hour (gph) or 3.785 Litre Per Hour ( lph)

Let's use a monster LT5 with 800 HP.

Engine Rated Power = 800 hp
Est. Fuel Consumption WOT = 80 gph or 302 lph

Basic rule of thumb multiple horsepower by.38 (naturally-aspirated motors) or .47 (force-induction motors). with this rule a 800 HP engine NA would need 304 lph.
How about a 800 HP forced induction motor 376 lph.

So lets take a 500 hp NA LT5 vs a 300 HP LT1. The LT5 would need 190 lph vs the LT1 114 lph. Lets assume that the stock pump is good for 150 lph you would have 300 lph because of the two pumps. Now what happens if a pump fails when the engine is at idle you would still maintain the 61 psig on a gauge. You go to wide open throttle and your now short 40 lph.

I would like to hear from some of the big engine LT5 owners. Did you install 24# injectors and high volume fuel pumps or are the 2 stock pump and injector sufficient to feed a 700 hp engine?

[WVZR-1]

Here is a link for the Bosch pump and gasket.

Part Number Description Comments
68238 Fuel Pump Tank Seal
68001 Fuel Pump Strainer
69223 Electric Fuel Pump In-Tank

http://www.boschautoparts.com/VehiclePartFinder/Pages/VehiclePartFinder.aspx

Robert,

I couldn't make your 69223 work for the 7.4 pump that is generally excepted as a service replacement for the LT5 but it is in their application guide for a '91 or earlier L98 likely. The gasket of course is a fit. The L98 is the only V8 application for that pump, the rest are all V6 and 4 cyl applications. I mention this only to keep someone from surmising it's a fit and not checking.

Would it work? Likely.

Airtex was the only aftermarket company that I recall to offer a replacement by part number for the LT5 but some have mentioned issues and I don't believe it's been recommended for many years. Brett I believe was the last to 'blast' it.

[cvette98pacecar]

Robert,

I couldn't make your 69223 work for the 7.4 pump that is generally excepted as a service replacement for the LT5 but it is in their application guide for a '91 or earlier L98 likely. The gasket of course is a fit. The L98 is the only V8 application for that pump, the rest are all V6 and 4 cyl applications. I mention this only to keep someone from surmising it's a fit and not checking.

Would it work? Likely.

Airtex was the only aftermarket company that I recall to offer a replacement by part number for the LT5 but some have mentioned issues and I don't believe it's been recommended for many years. Brett I believe was the last to 'blast' it.

I have several of the Bosch 69225 that is specked for the 7.4L. However the body of the pump is rounder and the sleeves on the fuel pump assemble have to be shaved. I will get measurements over the weekend.

[WVZR-1]

I have several of the Bosch 69225 that is specked for the 7.4L. However the body of the pump is rounder and the sleeves on the fuel pump assemble have to be shaved. I will get measurements over the weekend.

Andrew's install was for the 69225 pump and the modification of the sleeve is pretty well documented. You could though measure the ID of the sleeves so that there's a reference number that could be used for comparisons.

That diameter might influence some as to which pump to choose for future pump installs. It could certainly help avoid some 'disappointment' when it's found out that the $200 for pumps someone just purchased isn't a fit 'out of the box'. The diameter of both ends of the sleeve could be important. It's assumed that it's likely a uniform cylinder but then again may not because the pump needs to seat somewhere.

[Hog]

What is the flow rate on a stock pump. I was looking at some aftermarket pumps last night that flow up to 350 Lph.

Here is the Airtex info for their version of the Vortec 25163473 pump that appears to have a 50-60 gph (190-227 lph) but it states a free flow rate only. Closest to what I can find.



Gasket Included Y
Inlet Count 1
Inlet Type Strainer Item Grade Standard Replacement
Maximum Free Flow Rate (gph) 60
Maximum Pressure Rate (psi) 90
Minimum Free Flow Rate (gph) 50
Minimum Pressure Rate (psi) 80
Outlet Count 1 Outlet Size 3/8
Outlet Type Threaded



Here is a pic of the Ac Delco ZR-1 fuel sender and pumps. p/n FLS1102 and 19180770 for $299 from Rock Auto

http://i1202.photobucket.com/albums/bb373/Paul_Schermerhorn/fuel/zr1fuelsenser_zpsa7c77e24.jpg (http://s1202.photobucket.com/user/Paul_Schermerhorn/media/fuel/zr1fuelsenser_zpsa7c77e24.jpg.html)

[Schrade]

Welcome onto the boards there limo...

I put an Airtex in my '98 GMC [$323 from Advance], against recommendations of others w/A-Tex experience. The rap was that they fail often, and pumps can fail from getting hot. Gasoline keeps them cooled.

I keep my tanks full, so mine never got hot. None-the-less, it went belly up after 2 years. I had a ton of crud when I did it last month. The in-line filter was pretty plugged too.

I replaced it with something besides AirTex ($40 on eBay). I might get what I paid for, and maybe not.

I emptied the tank, filled it with aquarium gravel + some soapy water, and shook it for about :20. Then rinsed til it drained clear, dumped in some motor oil + WD from a gallon can to coat the tank interior and stop flash rust, the installed, and fired it.

Did you get fuel pressure tests done?

[limo1988]

Yes, I did buy a fuel pressure gauge, hooked it up, and at idle have 10 PSI! If I try pushing the pedal down very far, it stumbles. From idle I can ease it up a little bit and that is all. So looks like I need a fuel filter, fuel pump, or both..... Thanks to everybody for all of the good advice. And there sure are a lot of opinions on which of the many fuel pumps to install. Looks like the AC/DELCO complete unit from ROCK Auto for $299 is the best buy. And I watched a Youtube video on replacing the fuel filter. Looks like a bear to do, but much cheaper than going straight to the pump.
Dare I ask which is the correct fuel filter to install on a ZR1???

Thanks again, Limo1988(Steve):dancing

[cvette98pacecar]

Yes, I did buy a fuel pressure gauge, hooked it up, and at idle have 10 PSI! If I try pushing the pedal down very far, it stumbles. From idle I can ease it up a little bit and that is all. So looks like I need a fuel filter, fuel pump, or both..... Thanks to everybody for all of the good advice. And there sure are a lot of opinions on which of the many fuel pumps to install. Looks like the AC/DELCO complete unit from ROCK Auto for $299 is the best buy. And I watched a Youtube video on replacing the fuel filter. Looks like a bear to do, but much cheaper than going straight to the pump.
Dare I ask which is the correct fuel filter to install on a ZR1???

Thanks again, Limo1988(Steve):dancing

Stock filter. Nothing special there. Get one from Rock Auto when you buy the pump assembly. There are two pumps.

[Schrade]

WHOA!!!

Good job on DYNAMIC fuel pressure. Now do STATIC fuel pressure.

Don't buy a filter or a pump yet.

Check pressure leakdown time first.

If you have a leak in the line, your filter and your pump might be fine.

If you have leaking injectors, your filter and your pump might be fine.

If your FP regulator bladder is ruptured, your filter and your pump might be fine.

If you have a bad in-line check valve, your filter and your pump might be fine.

Probably a few more things can be wrong, and your filter and your pump might be fine.

Not much sense in replacing fine parts (although that IS the American way).



Yes, I did buy a fuel pressure gauge, hooked it up, and at idle have 10 PSI! If I try pushing the pedal down very far, it stumbles. From idle I can ease it up a little bit and that is all. So looks like I need a fuel filter, fuel pump, or both..... Thanks to everybody for all of the good advice. And there sure are a lot of opinions on which of the many fuel pumps to install. Looks like the AC/DELCO complete unit from ROCK Auto for $299 is the best buy. And I watched a Youtube video on replacing the fuel filter. Looks like a bear to do, but much cheaper than going straight to the pump.
Dare I ask which is the correct fuel filter to install on a ZR1???

Thanks again, Limo1988(Steve):dancing

[limo1988]

Hey, Schrade,

When I hooked up my fuel pressure gauge, the first thing that I did was turn the key to the ON position. I looked at the gauge, and it stayed at 0 pressure. Then I turned the key to Start position and the engine started and idled. That is when I registered 10 PSI. What does it mean if when Key ON and Engine OFF gives you 0 pressure? My pump must be working somewhat since the engine will start and idle at 10 PSI. Is one pump suppose to be working with the Key On Engine Off and the other pump (or both) working with Key On Engine On?

Thanks for the help... Limo1988(Steve)

[Schrade]

Not sure Steve...

On L98 (just a different TPI), pump would prime rails to pressure for 2 seconds, and pump would NOT re-start until a tach signal reached a certain RPM level.

Since yours DOES start, you have a drastic leakdown somewhere, and your diags won't depend on running engine.

It doesn't make sense that you have 0 PSI primed pressure. Maybe you DO have 10 primed, and it bleeds off before you can see the gauge???

Put the gauge where you can see it THE MOMENT that you turn the key to Start.

Note pressure.

Pull the vacuum hose to FPR, and see if there's gas in it. If so, the bladder is ruptured.

Next thing, if no fuel in FPR Vac supply hose, is to GENTLY pinch RETURN fuel line (use Vise-Grips, WITH SHOP RAG), and repeat test. That will rule out weak FPR bladder spring...

Post results...

[Hog]

Not sure Steve...

On L98 (just a different TPI), pump would prime rails to pressure for 2 seconds, and pump would NOT re-start until a tach signal reached a certain RPM level.

Since yours DOES start, you have a drastic leakdown somewhere, and your diags won't depend on running engine.

It doesn't make sense that you have 0 PSI primed pressure. Maybe you DO have 10 primed, and it bleeds off before you can see the gauge???

Put the gauge where you can see it THE MOMENT that you turn the key to Start.

Note pressure.

Pull the vacuum hose to FPR, and see if there's gas in it. If so, the bladder is ruptured.

Next thing, if no fuel in FPR Vac supply hose, is to GENTLY pinch RETURN fuel line (use Vise-Grips, WITH SHOP RAG), and repeat test. That will rule out weak FPR bladder spring...

Post results...


He is stating that he has 10 psi AS THE CAR IS IDLING.


""""""""
What does it mean if when Key ON and Engine OFF gives you 0 pressure? My pump must be working somewhat since the engine will start and idle at 10 PSI. Is one pump suppose to be working with the Key On Engine Off and the other pump (or both) working with Key On Engine On?
""""""
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxx

10 psi sure is a low spec. The injector spray pattern must be horrible. I'm surprised it fires.

Pressure gauge good?

There are these cool little clamps you can buy for compressing fuel lines. Perfect for the excellent diagnostics procedures Schrade gave above.

example
http://i1202.photobucket.com/albums/bb373/Paul_Schermerhorn/EFIConnection/fuellineclamp_zpsf02cbe81.jpg (http://s1202.photobucket.com/user/Paul_Schermerhorn/media/EFIConnection/fuellineclamp_zpsf02cbe81.jpg.html)

[limo1988]

When I turned the key to the ON position without starting the engine, I stood up and looked at the gauge sitting on top of the engine and NO reading visible. I stared at it for a moment and then squatted down into the car to push in the clutch pedal to start the engine. Only when running did I get a fuel pressure reading.

Sorry but I will be away from home for the next 3 weeks(out of the Arizona heat) and my ZR1 is all settled in with its cover on it. So I will pick up the diagnosing at the end of August. and thanks again for all the help.
Limo1988(Steve)

[Schrade]

When I turned the key to the ON position without starting the engine, I stood up and looked at the gauge sitting on top of the engine and NO reading visible. I stared at it for a moment and then squatted down into the car to push in the clutch pedal to start the engine. Only when running did I get a fuel pressure reading.

Sorry but I will be away from home for the next 3 weeks(out of the Arizona heat) and my ZR1 is all settled in with its cover on it. So I will pick up the diagnosing at the end of August. and thanks again for all the help.
Limo1988(Steve)

It's beyond me how it's starting with no fuel pressure.

Never mind nominal dynamic FP......................................

[5ABI VT]

Here is a link for the Bosch pump and gasket.

Part Number Description Comments
68238 Fuel Pump Tank Seal
68001 Fuel Pump Strainer
69223 Electric Fuel Pump In-Tank

http://www.boschautoparts.com/VehiclePartFinder/Pages/VehiclePartFinder.aspx

I ordered the 69223. Then I read later 69225... Just a bit confused here but did the 69223 work for factory replacement ??

[Johnny5]

I replaced both pumps in my car with the Ep361 i believe it was from rockauto. Advice from the forum guys (454 suburban pumps) it is a direct replacement although you need a dremel to shave off some metal. They work just fine. try to find a small strainer as mine were a little bigger than stock but you can fold it up to fit it in the tank

[cvette98pacecar]

I ordered the 69223. Then I read later 69225... Just a bit confused here but did the 69223 work for factory replacement ??

69223 is for the Corvette.
69225 is for the K1500 series trucks.

QFS-343FT 340LPH Racing Performance Intank Fuel Pump with Installation Kit. I think the stock pump is good for 140LPH@60psig.

http://www.amazon.com/QFS-343FT-340LPH-Racing-Performance-Installation/dp/B00V92UCJC/ref=au_as_r?_encoding=UTF8&Make=Chevrolet%7C47&Model=Corvette%7C440&Year=1990%7C1990&ie=UTF8&n=15684181&newVehicle=1&s=automotive&vehicleId=1&vehicleType=automotive

[5ABI VT]

69223 is for the Corvette.
69225 is for the K1500 series trucks.

QFS-343FT 340LPH Racing Performance Intank Fuel Pump with Installation Kit. I think the stock pump is good for 140LPH@60psig.

http://www.amazon.com/QFS-343FT-340LPH-Racing-Performance-Installation/dp/B00V92UCJC/ref=au_as_r?_encoding=UTF8&Make=Chevrolet%7C47&Model=Corvette%7C440&Year=1990%7C1990&ie=UTF8&n=15684181&newVehicle=1&s=automotive&vehicleId=1&vehicleType=automotive

Someone mentioned that it worked for the standard corvette and not the ZR-1 and the suburban pump was the one that worked for the z? Should have done my research a bit better I'll probably send these back and order the 69225. I believe several people have done that pump already.

[cvette98pacecar]

Someone mentioned that it worked for the standard corvette and not the ZR-1 and the suburban pump was the one that worked for the z? Should have done my research a bit better I'll probably send these back and order the 69225. I believe several people have done that pump already.

Mike, the stock corvette used 1 pump while the Z uses 2. I remember Mark H. saying he had saw Z's that he had worked on where the wrong fuel pump assembly was installed.

[WVZR-1]

Someone mentioned that it worked for the standard corvette and not the ZR-1 and the suburban pump was the one that worked for the z? Should have done my research a bit better I'll probably send these back and order the 69225. I believe several people have done that pump already.

Is there any identifiable information inked or etched into the pump housing?

With all of the compiling of pump performance into fewer part numbers if I had already purchased these, had to pay the duties to get them delivered, was going to have to pay a handling charge, more duties for the 69225 buy, pay shipping two ways again AND IF the car were basically stock I might choose to use them vs. the return. Those pumps are likely as good as OR better than those $25 specials at RA that people buy just because they're cheap and no one has actually benchmarked their performance. Some manufacturers I'd think build a few pumps to a "greater" spec than OE for some and just toss them in a box and sell them as a part numbered product that makes us/buyers think were buying a correct spec'd product.

Something to consider maybe - - -

I ain't suggesting but it's maybe something to consider. A good bit likely depends upon the relationship you have with the vendor.

[5ABI VT]

I did take a photo of the pump and numbers. I honestly haven't found anything or know how to cross link workable pumps like some guys have mentioned so I was going by what was posted. I saw 69223 mentioned above and the started to see 69225 everywhere else and realized I may have made a mistake.

I do know fuel pumps are not flux capacitors and are relatively cheap for what they are and therefore am not hinting the $23 pumps are bad in any way.. I just didn't fee comfortable with a $23 pump. For $40 more the Bosch pump claims to be of a different design and balanced at speed with reduced noise etc and I always try and spend the extra if there's any possible gains/benefits to be had. Maybe it won't be noticeable at all but it's peace of mind to me.

Here's a pic of the 69223. If the regular corvette pump is not the same as the dual ZR-1 pumps it leads me to believe there is a reason for that wether it's fuel flow or size for figment Into the different assembly. The car is relatively stock and i have read oem pumps are good for a good amount of hp over stock so I'm looking for the best quality pump that is oe replacement.
http://img.photobucket.com/albums/v141/5abivt/Air%20Filters/2646B440-CED1-47C6-85F6-255CC4CC0052_zpsddqzjs8l.jpg (http://smg.photobucket.com/user/5abivt/media/Air%20Filters/2646B440-CED1-47C6-85F6-255CC4CC0052_zpsddqzjs8l.jpg.html)

[5ABI VT]

Is there any identifiable information inked or etched into the pump housing?

With all of the compiling of pump performance into fewer part numbers if I had already purchased these, had to pay the duties to get them delivered, was going to have to pay a handling charge, more duties for the 69225 buy, pay shipping two ways again AND IF the car were basically stock I might choose to use them vs. the return. Those pumps are likely as good as OR better than those $25 specials at RA that people buy just because they're cheap and no one has actually benchmarked their performance. Some manufacturers I'd think build a few pumps to a "greater" spec than OE for some and just toss them in a box and sell them as a part numbered product that makes us/buyers think were buying a correct spec'd product.

Something to consider maybe - - -

I ain't suggesting but it's maybe something to consider. A good bit likely depends upon the relationship you have with the vendor.


It's my mistake really. I'm a little impatient and I even paid for the fast 2 day shipping to Canada ($43) so I'll lose that :( at the least. Going to reorder the 69225s and strainers today.

[Hib Halverson]

I have a 1990 ZR1 and I think I may have a failing fuel pump. What I would like to know: Is there a specific LT5 fuel pump and where can I buy it? Where specifically is the location on the LT5 for the connection for a fuel pressure gauge? Any help would be appreciated...

First, don't guess at the fuel pumps because the cost of the replacement parts and that the labor involved pulling the pumps then adapting the Chevy truck pumps to the ZR-1 fuel pump/sender assembly can be time consuming.

First, you need a copy of the Factory Service Manual for 1990. Then, you need to run the fuel pressure tests listed in the manual. The diagnostic procedures in the book will help you test both pumps along with the rest of the fuel supply system (fuel lines, fuel filter, regulator and etc).

You didn't say what symptoms the car has which makes you think the pumps are bad but the symptoms which make people think they have a fuel pump problem can, indeed, be caused by failed fuel pump(s) they also can be casued by components other than fuel pumps.

Good luck!

[Hib Halverson]

Mike, the stock corvette used 1 pump while the Z uses 2. I remember Mark H. saying he had saw Z's that he had worked on where the wrong fuel pump assembly was installed.

There is only one pump assembly for LT5s. What Marc may have seen was stock fuel pump/pick-up assemblies fitted with the wrong pumps, ie: someone decided to DIY the individual pumps and used the wrong ones.

When you do the DIY replacement of the individual pumps make damn sure you'll installing the right pump. Get the wrong pump(s) and you may wonder why your engine holes some pistons.

Finally I looked at Rockauto.com and they may not understand that the ZR-1 pump assembly is different than that for a 1990 base car because both of the complete pump/sender assemblies they sell are for L98s.

Corvette parts vendor, Zip Products sells a complete ZR-1 pump/pick-up assembly (PN GT-406). They also sell individual pumps.

There is a step-by-step how-to on replacing the ZR-1 fuel pump/pick-up assembly at http://www.corvettemagazine.com/tech-articles/1984-1996-c4-corvette-fuel-sending-unit-installation/

[cvette98pacecar]

There is only one pump assembly for LT5s. What Marc may have seen was stock fuel pump/pick-up assemblies fitted with the wrong pumps, ie: someone decided to DIY the individual pumps and used the wrong ones.

When you do the DIY replacement of the individual pumps make damn sure you'll installing the right pump. Get the wrong pump(s) and you may wonder why your engine holes some pistons.

Finally I looked at Rockauto.com and they may not understand that the ZR-1 pump assembly is different than that for a 1990 base car because both of the complete pump/sender assemblies they sell are for L98s.

Corvette parts vendor, Zip Products sells a complete ZR-1 pump/pick-up assembly (PN GT-406). They also sell individual pumps.

There is a step-by-step how-to on replacing the ZR-1 fuel pump/pick-up assembly at http://www.corvettemagazine.com/tech-articles/1984-1996-c4-corvette-fuel-sending-unit-installation/

Hib, I thought the LT-1, LT-4 cars used a fuel pump assembly with one pump, The LT5 assembly has the second pump. I do not believe the pumps are different.

[cvette98pacecar]

The 'challenge' with that particular Racetronix pump might be the 38mm diameter and the fit into the sleeves of the ZR-1 sender sleeves. That pump has a similar vane type drive advertised by Bosch for the pump that Andrew had to modify the sleeves on to get a fit. I believe that when these pumps are spec'd they're intentioned for the vertical sending unit that has no diameter restrictions regarding the mount. It might be interesting if someone has an old tank unit and they could measure the ID of the sleeves. The only one I have is new and assembled and I can't get a vernier caliper in there to accurately say yes or no but it looks like it could be a challenge.

You can't assume any longer that Delphi implies GM or NOT and they might very well do a GM pump to different specs but the Delphi pump replacement for the GM 25163473 (FE0114) is spec'd at 425 kPa (61.64 PSI) application pressure and 500 - 750 kPa (72.5 - 108.7 PSI) relief pressure. The only flow rate mentioned is 27 with no mention of unit of measure. It's also maybe a little 'chubby' at 36.7mm. It's applications are all for the vertical standing senders also.

Found this from a cross reference guide. No specs on flow rates.

Bosch 69225 upgrade pump
Airtex E320
Carter Part P74074 & P74167
Delphi FE0114
OE 25116458
VIO 2,054,031
Application
Buick, Cadillac, Chevrolet, GMC, Oldsmobile, Pontiac

http://www.boschautoparts.com/documents/11100/0/0/43ca08c8-73dd-4a0f-ae04-54f31ee87906

[5ABI VT]

Does the Burban pump have the same connector /plug as the oem pumps ? Assuming so but just double checking