Fuel Sending Unit

[W i l l]

Does anyone have an extra fuel sending unit they are willing to sell? Please contact me at William_barrett@oxy.com if you do. Mine is rusted and fell apart....forgot to put in fuel stabilizer a few years ago. I always learn my lessons the hard way :-)


Will

[Ccmano]

This may very well be our next critical shortage part. While fuel pumps are in good supply due to their use in other applications, the sending unit as a whole AC/Delco #FLS1102 GM#25028725 has been getting scarce recently. As with Will, the units are prone to rusting out even under the best of circumstances. A quick internet search turns up only one supplier with stock (at least according to the website, and I’m not counting White Racing due to their recent issues and tendency to price gouge, he’s asking $961 for his) Surprisingly that’s Autozone. I guess the only way to know if they really have one is to order it.
https://www.autozone.com/external-engine/fuel-pump/acdelco-fuel-pump/860933_66949_0
H
:cheers:

[W i l l]

I tried Auto Zone yesterday, and even though the fuel sending unit is listed on their website, it is unavailable...

[Ccmano]

I tried Auto Zone yesterday, and even though the fuel sending unit is listed on their website, it is unavailable...

Answers that question. Let’s hope one of the members has one their willing to sell.
H
:cheers:

[Reichert]

RockAuto has it listed in stock for $293 https://www.rockauto.com/en/catalog/chevrolet,1990,corvette,5.7l+350cid+v8+dohc,104127 5,fuel+&+air,fuel+pump+&+housing+assembly,10147

-Stephen 1990 #2288

[Ccmano]

RockAuto has it listed in stock for $293 https://www.rockauto.com/en/catalog/chevrolet,1990,corvette,5.7l+350cid+v8+dohc,104127 5,fuel+&+air,fuel+pump+&+housing+assembly,10147

-Stephen 1990 #2288

Funny, they were out of stock when I looked earlier today and still shows that way when I click the link.
H
:cheers:

[W i l l]

Don't know why, but Rock Auto shows it to be in stock until you check out, then it takes it out of the basket and says the part is not available.


Will

[Reichert]

Sure enough - same thing when I try to buy it. What a tease!

-Stephen 1990 #2288

[kr1276]

I just went through this recently and had the same luck. Decided to order the Stewart Warner Universal unit 439363-D as recommended by other forum members. Have not installed it yet but it is a quality piece. Will require some modifications but after looking at using the standard C4 unit and modifying it vs modifying the stock ZR1 with a better sending unit was a simple decision for me.

[Ccmano]

I just went through this recently and had the same luck. Decided to order the Stewart Warner Universal unit 439363-D as recommended by other forum members. Have not installed it yet but it is a quality piece. Will require some modifications but after looking at using the standard C4 unit and modifying it vs modifying the stock ZR1 with a better sending unit was a simple decision for me.

So your adding the SW unit as a sending only and leaving the pumps on the the original frame?
H
:cheers:

[kr1276]

Yes. Check out the link below and you will see pics of the end result. This is not mine but I am doing mine just like this.

http://www.zr1.net/forum/showthread.php?t=29705

[Ccmano]

I see. So your just removing the rheostat and float from the SW frame and attaching it in place of the OEM rheostat.
H
:cheers:

[Jagdpanzer]

I found the existing mount area to flimsy so I reinforced with the SW mount bracket
9239


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[kr1276]

I am also using the SW mount as Phil mentioned. Thanks again Phil for the pics! Should last a lifetime this way

[W i l l]

A big thank you to the gentleman from Washington who sold me a used sending unit for the ZR-1. I put high flow Walbro pumps in it and it goes back in the car on Thursday. Then off to the South Texas ZR-1 BBQ on Friday!!! You gotta love this spring weather :-)

[Pete]

If secondary port throttles are removed we can use a regular single pump C4 sending unit with better pump.

Pete

[Ccmano]

If secondary port throttles are removed we can use a regular single pump C4 sending unit with better pump.

Pete

Now that’s interesting, tell me more... what size pump and does the programming need to be changed.
H
:cheers:

[Pete]

Now that’s interesting, tell me more... what size pump and does the programming need to be changed.
H
:cheers:

You will need to use a couple of clamps to mount the pump to the sending unit.
It could be done and with this pump http://walbrofuelpumps.com/450lph-walbro-e85-racing-fuel-pump-f90000267.html should be plenty to hadle anything.
I'm thinking of going that route.

Yes, i would reprogram the chip for no secondaries.
Pete

[Ccmano]

You will need to use a couple of clamps to mount the pump to the sending unit.
It could be done and with this pump http://walbrofuelpumps.com/450lph-walbro-e85-racing-fuel-pump-f90000267.html should be plenty to hadle anything.
I'm thinking of going that route.

Yes, i would reprogram the chip for no secondaries.
Pete

Cool, already lost my secondaries and tuned appropriately. Have to look into that.
H
:cheers:

[indy91zr1]

You will need to use a couple of clamps to mount the pump to the sending unit.
It could be done and with this pump http://walbrofuelpumps.com/450lph-walbro-e85-racing-fuel-pump-f90000267.html should be plenty to hadle anything.
I'm thinking of going that route.

Yes, i would reprogram the chip for no secondaries.
Pete

I ran this pump in my Subaru STI. I had to hardwire it to get the best performance out of it. That was just because of the fuel controller they used for the stock pump though. I don't know if the z has that or not? It did exactly what is was supposed to do though. Was a great pump.

[W i l l]

I considered a standard C4 sending unit, but decided to stick with the dual pump setup to feed the 1000 HP TT.

I was thinking that no programming changes would be required even if the secondaries throttle plates are still in place as long as the pump you use will provide enough fuel for full power. It will run off the primary fuel pump electrical circuit so the fuel will be available all the time.

[indy91zr1]

One thing to consider is that just leaving it plugged into the stock wiring it may not net you the voltage you need to run those pumps at that power level. With it hardwired to a relay off the battery it will basically get around 13-14volts while running. While if hooked to the stock wiring it might only read 11.5-12 volts. I am not certain as I am used to cars that are newer so they have an actual fuel control module. 1000 hp tt sounds pretty sweet.

[mmitton]

Same problem for my 90 - the fuel gauge hasn't worked for a long time. It always shows empty. Tried to find a replacement with no luck so after some searching I found a place that claims to be able to rebuild the one I have. I'm a little hesitant so I'm wondering if any of you have ever heard of them or perhaps used them. Here's the link: http://www.tristarrradiator.com/

[dredgeguy]

Nice find

[Young1]

Mmitton. Precast1 had same issue as you on his 1,700 mile 90. I fixed his with a pencil eraser and a solder gun. Eraser cleaned the rheostat surface. We discovered lack of continuity across a solder joint. Re soldered the joint and all was well. We figured it had a micro break is the joint unseen to the eye.
I would be glad to do the same for yours if sent to me. Send PM



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[Young1]

Is Marc Haibeck offering a service to rebuild our in tank units? Pumps and sending device?


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[mmitton]

Thanks Steve Young - PM sent.