Question about 1987 GMC V1500

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1987 GMC sierra , no fuel pump power.

My 1987 gmc sierra had a 305 fuel injected in it. i swapped it with a 350 fuel injected., it ran great for a month. took it to get a new exhaust, they called me up when it was done and when they went to move it off their hoist it wouldnt start. i brought gas, didnt start, changed fuel pump, didnt start, changed fuel pump relay didnt start, checked all fuses under driver side dash, all ok. I can hear the fuel pump relay click over. my fuel gauge works. and i know for sure my fuel pump works because i can jump it off 12v and start the truck and it runs great.

i took my test light and im not getting any power.

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  • coldhd Jun 26, 2009

    i just ran a wire into my spare ignition port off of my fuse panel under the driver side dash. i can hear my fuel relay click when i flash it up. theres just no power getting to my fuel pump and i tryed tapping into my wire with 12v at the other end and put the tester of the other end and had power so i know its not the wire running back to the fuel pump.

  • cody Jun 13, 2013

    wich pin is the positive and which is ground i have the same exzact problem but i cant find a pin diagram if you could help i would greatly apreceate it

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  • Master
  • 4,669 Answers

The inline fuel pump fuse on the passenger side firewall is good? Are you jumping it with 12 volts at the test lead or the fuse?

Posted on Jun 26, 2009

  • 1 more comment 
  • Clint Smock
    Clint Smock Jun 28, 2009

    You checked the fuse on the firewall right.

  • Mr.Timothy Harrington
    Mr.Timothy Harrington Apr 07, 2013

    there is no fuse ther on my 1987 r2500 gmc 5.7 now what

  • Mr.Timothy Harrington
    Mr.Timothy Harrington Apr 07, 2013

    by fuse ya mean relay there are two there the same and relay plug can go to either of them

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