No power to fuel tank

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by JePride33, May 15, 2013.

  1. JePride33

    JePride33 New Member

    I have a 99 chevy z 71 5.3 liter. All my fuses and relays are good and i put in a new fuel pump, but still have no power to fuel tank . When i hook scan tool to hook up under dash it tells me no connection. Please help i need my truck. Thanks
  2. shibby2oo8

    shibby2oo8 Member 2 Years 100 Posts

    Power to the scanner and power to the pump are 2 completely different things, check the inside and all fuses and check to see if your cig lighter/ power outlets work.
  3. RayVoy

    RayVoy Epic Member 5+ Years 5000 Posts

    It's a simple circuit, so I am going to ask some dumb ass questions.

    - how do you know all fuses are good?
    - how do you know the pump relay is good?
    - how do you know (other than what you said in the 1st post) that there is no power to the pump (perhaps you have 12v and you do not have a ground?
  4. shibby2oo8

    shibby2oo8 Member 2 Years 100 Posts

    Also is it no power to the scanner or no communication because a dead computer or no power to it can cause both of those probs. Too vague here we need more info.
  5. JePride33

    JePride33 New Member

    Been through all fuses and relays and replaced them still no power with connectors hooked up at the tank. The scan tools says no communication.

    - - - Updated - - -

    Truck cranks, oil pressure comes up, all gauges work, but fuel gauge sits on E. Speedo was maxed but back to zero now agter disconnecting battery
  6. RAV52202

    RAV52202 Rockstar 100 Posts

    I would check all my ground wires. I had a 96 and ended up replacing all ground wires, and I do mean all ground wires. Even the one to the fuel pump on the frame. That fixed all my problems. i had the same symptoms except the no communication for the obdII. Also if i'm correct you will only have power to the pump for a few seconds when you turn the key on unless the truck is running. Just throwing things out there.
  7. JePride33

    JePride33 New Member

    Thanks im gonna start chasing n replacing wires. If ya think of ne thing else please let me know. Thanks again.
  8. j cat

    j cat Epic Member 5+ Years 1000 Posts

    remove the fuel pump connector and measure the voltage .then work back to the fuel pump fuse for voltage then the fuel pump relay .

    connect a pressure gauge on the fuel rail when doing the voltage tests .

    scan tool no communication with power at the scan plug could mean the PCM is blown.

    if the key was in the ignition when the battery was disconnected this could blow fuses and the PCM..
  9. JePride33

    JePride33 New Member

    Thanks for all the info. It turns out it was the ECM B fuse.
  10. shibby2oo8

    shibby2oo8 Member 2 Years 100 Posts


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