NO POWER TO FUEL PUMP

  • Tiny
  • fabian19720
  • 1987 Chevrolet Silverado
  • 89,000 miles

I just replaced fuel pump cause had no power lucky I did cause strainer was bad but still no power to it but when I run jumper from fuel relay to 12 volts the pump works it does have dual tanks but the passenger side doesnt work theres not any fuse links on power wire by battery only by alternator and down by starter both are good check fuel relay and its good. Did separate the fuse box from outer but dont see any fuse links there either. Have any idea on where else I can check?

Tuesday, August 21st, 2012 AT 5:43 PM

13 Answers

  • Tiny
  • KHLow2008
  • Expert
  • 41,976 posts

Did you test the fuel pump relay? If relay is good, it is not being energised, either no power supply from ECM or it is not being grounded.

Does the Dark Green/White wire at fuel pump relay has battery voltage when ignition is turned on and while cranking?

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Tuesday, August 21st, 2012 AT 6:19 PM
  • Tiny
  • fabian19720
  • Member

Not really sure if I check it and I dont have voltage there where do I go from there as I already tried changing ecm and no difference

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Tuesday, August 21st, 2012 AT 6:52 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,976 posts

What is your vehicle specific model? R10, R20 etc?

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Tuesday, August 21st, 2012 AT 7:00 PM
  • Tiny
  • fabian19720
  • Member

R10 2-wheel drive

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Tuesday, August 21st, 2012 AT 7:22 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,976 posts

At the ECM, check terminal A1 for battery voltage with ignition turned on. This would only last a couple of seconds as the fuel pump primes. Crank the engine and if battery voltage is available, you have a broken connection between the ECM and the relay.

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Tuesday, August 21st, 2012 AT 9:35 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,976 posts

There are 5 terminals for the fuel pump relay, do you have battery voltage at the Tan/White wire? If no, check the oil pressure switch.

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Tuesday, August 21st, 2012 AT 9:38 PM
  • Tiny
  • fabian19720
  • Member

Do u have the wiring diagram for the fuel system in my truck that u can post for me

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Tuesday, August 21st, 2012 AT 10:42 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,976 posts

Here you are. They are too small so I split them up. See if you can print them out and join together for a clearer picture.

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Tuesday, August 21st, 2012 AT 10:50 PM
  • Tiny
  • fabian19720
  • Member

Ok on my truck on same bracket as fuel relay theres another relay there with different number but nothing plugged into it do u have any idea on what its there for

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Tuesday, August 21st, 2012 AT 10:59 PM
  • Tiny
  • fabian19720
  • Member

I read on another website that some trucks cam out with a 20 second relay for harder starting trucks not sure if thats what it is or not

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Tuesday, August 21st, 2012 AT 11:05 PM

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