LT5 fuel pump?

[Hog]

Originally Posted by cvette98pacecar

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



Specs here.
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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
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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/Vehicl...artFinder.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,cata...IC_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]

Originally Posted by 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/Vehicl...artFinder.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]

Originally Posted by WVZR-1

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]

Originally Posted by cvette98pacecar

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]

Originally Posted by cvette98pacecar

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