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Thread: fuel pump control

  1. #1
    Lifetime Member THEFERMANATOR's Avatar
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    Default fuel pump control

    How does the fuel pump control circuit work inside of an 01 LB7 ECM? I am hooking up a lift pump and was wanting to know if this circuit could be used to control it or if there is a table in EFILIVE I can use to set it up? I am currently building my project and doing the wiring and was deciding wether to keep my oil pressure switch to turn on my lift pump or to use the ECM.
    1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
    DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.

  2. #2
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    there isnt a fuel pump function available to us in the ecm. you could use the dsp output though if you plan to run a dsp tune
    03 Silverado CCSB LT Summit White
    417rwhp / 898trq <-old numbers need time to get on the rollers again
    4" Straight Thru Exhaust, Suncoast IV W/ 1058, Amsoil everything, EFILive DSP5 tuned by me with some help from Nick, PPE lift pump, and a BD spinny thing

  3. #3
    Lifetime Member THEFERMANATOR's Avatar
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    I know my ECM has one in it that was used for the transfer pump if it had dual tanks, didn't know if this circuit could be converted or not to power a lift pump for the engine instead of the transfer pump that pumped fuel from the rear tank to the front tank.
    1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
    DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.

  4. #4
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    Wondering how you made out with this?

    GM data says the transfer pump turns on when the rear tank level is higher than the front by a certain amount, and once the front is higher by a certain amount, the pump is disabled again. In effect averaging the fuel level between the two. The fuel gauge does operate on a combined signal of the two tanks.

    I'm trying to use this same circuit to use the pump as designed but so far no luck with rescaling the secondary sensor with EFI Live. My next step is physically wiring in a potentiometer into the circuit and watching the data. I have successfully engaged the pump with EFI Live scan tool, but so far no other progress.

  5. #5
    Lifetime Member THEFERMANATOR's Avatar
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    I ended up using a 6.5 oil pressure sensor as it is a 3 wire. 1 wire for the gauge, and the other 2 were for the fuel pump. So mine runs when the engine is running. The 01-02 trucks can use the 6.5 diesel sending unit and use it to power the fuel pump relay. I know most just wire it to run when the key is on.
    1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
    DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.

  6. #6
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    Don't mean to hijack your thread here, but do you know any more about the transfer pump circuit, do I need a different OS to make it work? or is the logic all in place, it just needs to see the secondary sending unit value?

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    Quote Originally Posted by Zorganov View Post
    Don't mean to hijack your thread here, but do you know any more about the transfer pump circuit, do I need a different OS to make it work? or is the logic all in place, it just needs to see the secondary sending unit value?
    You have to run a cab and chassis fuel system in the ECM to make it work. Also it must see 2 working level units or else it will default the gauge to empty and not trigger the transfer pump.
    1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
    DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.

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