Question about 1996 GMC Sonoma

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Put in a 4.3 carb motor in my 96 gmc sonoma had a 2.2.Run the in tank fuel pump with regulator set at 7 psi.pump will run when key is turned on but not when truck is running.why?Did i miss some wires.

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  • mdctractors Mar 23, 2011

    holly 600 carb will run up to 9 psi still have the computer harness on truck have oil press water temp hooked up.hei wire to stock wire for 2.2 coil pack wire. After market fuel reg aeromotive part no 13301 fuel by pass on bottom.Runs great till fuel bowl runs dry.

  • mdctractors Mar 23, 2011

    This truck has a holly carb 6 to 9 psi is what holly wants .didnt do any wire change only to hook up the hei.why should i have to rewire the fuel pump?

  • mdctractors Mar 24, 2011

    Thanks for all the great info .You do a good job.

  • mdctractors Mar 24, 2011

    Very help full hope it works

  • mdctractors Mar 25, 2011

    Hey thanks alot for every thing.Hope to get to work on it this week end .thanks again

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  • Master
  • 1,168 Answers

Hello MDC.

You will need to hook up an oil pressure switch to keep the fuel pump running.
The computer runs the pump when cranking but the oil pressure switch is what keeps it running.
This is to keep the fuel pump from running if the engine quits or if in an collision the fuel pump shuts off.
You may be able to use the switch from the 2.2.
If there is a pressure switch for the oil gauge already in the 4.3 you may need to install a tee to adapt it in.
The wire colors you are looking for to the switch should be orange and gray.
If you need further assistance with this, please ask me in a comment here.

Thank you for using FixYa.
KL

Posted on Mar 24, 2011

  • FUBAR Mar 24, 2011

    Thank you MDC.
    If you need a little more help with this problem, ask me here and I will help if I can.
    KL

  • FUBAR Mar 26, 2011

    OK, let me know how it works out.
    .....KL

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  • Master
  • 2,510 Answers

Firstly, 7 psi is too high for a carb and will tend to override the needle and seat, you want a fuel pressure somewhere around 3 to 3.5 psi max.

You must have the pump wired up to a connection that is off when the engine is running but on in the accessory position. Try find a supply like the ignition supply and run it through a relay to power the pump.

Posted on Mar 23, 2011

  • Hans Pearson
    Hans Pearson Mar 23, 2011

    If you are still running through the old harness and I take it the computer as well? isn't the computer cutting out the fuel pump when the engine is running because there is a signal missing which would normally energise the fuel pump, some shared signal from the no longer there fuel injection?

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