3rdgenfever

here is the difference between the 2 fuel pump connectors, you can take out the 2 terminals for the sending unit and put them into your unit, second one is the unit itself, last is the bulk connector with the fuel pump wires and sending unit wires

blakecharles

thanx, I got it figured out!

camarotucker

iTrader: (2)

$40 autometer unit: 240-33
$40 VDO unit: 0-90
$130 GM 25319676: 0-90

Has anyone actually installed one of these universal sending units in a plastic LS1 tank?

blakecharles

that's another question that I never got answered. I have no idea if it will work. I guess for $40 I could try to make it work or send it back if it dose not. I almost ordered the VDO unit. Looks like you get the float and arm as well as the sensor. lots of susses stories installing them in metal tanks. I have never found anything about installing them into a plastic tank.

camarotucker

iTrader: (2)

Blake your question about the diffrent plugs was anwsered, you just missed it (as I missed it myself). The GM 25319676 (Grand Prix) sender kit comes with 2 fuel level senders in the box, both are 0-90 ohm. It doesnt matter what plug is on the end for the fuel pump connection. You can take a straightened paper clip and stick in the notch (third picture down in post #101) and pull the terminals out of the bottom of the connector and swap them with your OEM fuel pump plug harness. I went the GM 25319676 route and split the cost with another board member bring the cost down to $65. I Know that you (blake) found your solution, but I wanted to post this so that the next person who is trying to figure this out doesnt have to go thought the frustration and confusion that we went through. Additionally, I found one board member who did go with the $40 VDO universal sender, post #2.
https://www.thirdgen.org/forums/ltx-...swap-into.html

Cody's86Camaro

so can anyone tell me what the reason is to put the plastic tank in in the first place???

cam-

In my case I bought a tank complete with pump and lines for 90 bucks shipped. The stock TPI pump wont support the required 58psi pressure for LS1 engines so regardless of tank swap you need to upgrade the pump. Secondly the factory fourth gen LS1 tanks ( NOT V6 however ) are also regulated at the tank thus eliminating the need for an additional fuel pressure reg. Thirdly the LS1 fuel tanks use a bucket assembly for the fuel pump that prevents pretty much ANY fuel starvation problems both in high G cornering and in high powered drag launches. Fourthly the LS1 fuel tanks come with the charcoal canister and atmospheric evap all in one so its a much cleaner way to fly so to speak. Fifthly they are plastic and wont rust out ever. Sixthly they are a HELL of a lot easier to re and re than a factory third gen steel tank is they are a major pita. Seventhly.... Need i go on?

Plenty of good to the swap.

Cody's86Camaro

well all im wonting to do with my car is put a 5.3 with an t56. maybe just maybe a sightly bigger cam. thats all im gonna do to mine. can i just upgrade to a larger pump? do they make them to support the 5.3?

cam-

All LS engines run the same 58-61psi fuel pressure. If you read the swap sticky its all listed in there. Theres even a link to buying the fuel kit and running your stock third gen. Theres a TON of good info in there probably all you'll need nowadays

Cody's86Camaro

thanks for clearing that up. im new to all this.. do you have a good link that has all that info on it?
thanks, Cody

cam-

Im sure if you read all of this you will be off and running

https://www.thirdgen.org/forums/ltx-...third-gen.html

Cody's86Camaro

wow thanks alot!!

88FormulaKiller

iTrader: (8)

+1000000 .. couldnt have said it better myself.

joe91transam

Im istalling aftermarket gauge on my 91 trans am. All the wiring was off when i bought the car, so im putting a ls 5.3 on it. And most than likely im going to use the fourth gen fuel tank, with the fuel pump.does anybody know if i will have to do some kind of modification on my fuel sending unit for my aftermarket gauge to work?

camarotucker

iTrader: (2)

https://www.thirdgen.org/forums/ltx-...s1-fuel-3.html

joe91transam

Thanks for that camarotucker. But im going to use a 4th generation fuel tank, i dont have a stock fuel tank. But my question is, will this conversion posted here work on a aftermarket gauge, like a autometer gauge?

camarotucker

iTrader: (2)

post # 99

88FormulaKiller

iTrader: (8)

just ask yourself one thing, whats the ohm sweep on your aftermarket gauge? that will give you your answer to whether it needs to be modified.

Marc 85Z28

iTrader: (3)

Reviving this thread to help others save some money.

Herko sells the 0-90 ohm fuel level sensor for $24 shipped.

Soulstis

iTrader: (1)

Thank you! I was thinking damn $130 for just that little piece of junk. Nice to see some people still research and help others! You rock!!

Ozz1967

iTrader: (4)

Is that the user or name of the regulator?

Marc 85Z28

iTrader: (3)

What? Click the link!

Strick1

How do you know which one to get? Do you pick the one that fits the Gen 4 tank pump unit ?

Trentec

The 1996 S10 has a 0-90 ohm sender that should clip right in to that sump.

Mdenz3

iTrader: (7)

Which one of you is taking one sensor out then returning the kit?

Just got mine in from RockAuto.com and there was only one sensor in the box. Now I have to return and wait for a replacement to arrive.

Brian Laycox

So has anyone figured this out yet? I read a lot of talk on here but nobody really gave a really clean answer.

I have a 4th gen LS1 fuel sender (240ohms) going into the stock 3rd gen fuel gauge (90ohms). Right now my gauge cluster is out of the dash. Can I do anything to the purple sender wire to make the 3rg gen gauge work (adding resistors?) Or is my only option to go into the tank and mess with the actual sender? Resurrect this old post!

QwkTrip

iTrader: (22)

Stock gage does not work properly with 4th gen fuel sender because it will bias to the high side and never read EMPTY. That's a characteristic of the gage that cannot be changed with calibration resistors. The sender must be 0 Ohm to pull the gage needle to EMPTY. You need a 0-90 Ohm sender to get proper sweep of the gage at a constant rate.

This thread shows the sender swap in great detail, https://www.thirdgen.org/forums/ltx-...e-4th-gen.html

camarotucker

iTrader: (2)

1-19-23
Herko Fuel Level Sensor part # GFC31 is good, found on Ebay $23.00 shipped.

GM part is discontinued and no available stock.