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Thread: fuel sending unit swap

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  1. #1
    Join Date
    Dec 2011
    Location
    Savannah, ga
    Posts
    315

    fuel sending unit swap

    i'm doing an lq4 swap into a 1997 truck, i've got a gauge cluster from a 2002 truck as well that i am going to put in, a problem i know is that the fuel gauge wont work as the ohms are different in the two trucks. i stopped by advance auto today and checked and they have a fuel level sending unit for like 30 bucks for the 2002 truck, if i pull my old sending unit off and put this one on will it work? i'm sure i will have to change the wiring around or something.

    has anyone of you done this?

  2. #2
    Join Date
    Dec 2011
    Location
    Savannah, ga
    Posts
    315
    so according to this if i ground one wire and run the other wire from the fuel level sending unit to Pin 54 on the C2 Connector then the gauge should have the signal it needs to work correct?


    2002 fuel gauge.jpg

  3. #3
    Join Date
    May 2009
    Posts
    428
    Well I'm no expert but you have the same issue I had, the 02' IPC is serial data controlled as Is mine. When I hooked my 00 Camaro LS1 into my 04' Colorado, my gas gauge read backwards. My sending unit was 3 wires. Two hot wires and one ground, I swapped the 2 signal wires and it fixed my problem. I have also heard of people bending the floats to compensate for this, but I would not recommend that.

    Serial 2 data wire requires input from BCM, messing with that is a real trick. Hopefully someone more professional will post something, BUMP BUMP!!

  4. #4
    Join Date
    May 2007
    Location
    Oak Forest, Illinois
    Posts
    276
    Why are you putting a 2002 Cluster in your 97???

    Jeff
    98 GMC RCSB 2wd, 100% internally stock 305, w/twin T-3 junkyard turbos,Ramjet intake w/42lb inj,12200411 PCM. 4675lbs w/me in it. Best time in 5 passes 13.01@110

  5. #5
    Join Date
    Dec 2011
    Location
    Savannah, ga
    Posts
    315
    Quote Originally Posted by Lextech View Post
    Why are you putting a 2002 Cluster in your 97???

    Jeff
    cause it looks better and all the gauges will work without a bunch of hassel of dual sensors

  6. #6
    Join Date
    May 2007
    Location
    Oak Forest, Illinois
    Posts
    276
    What PCM are you going to use? If it is an LS1b PCM---It will run the engine and dash without dual sensors.

    Jeff
    98 GMC RCSB 2wd, 100% internally stock 305, w/twin T-3 junkyard turbos,Ramjet intake w/42lb inj,12200411 PCM. 4675lbs w/me in it. Best time in 5 passes 13.01@110

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