1987 GMC SIERRA 1987 GMC HAS NO POWER TO FUEL PUMP RELAY

  • Tiny
  • teresaj
  • 1987 GMC Sierra

Electrical problem
1987 GMC Sierra V8 Four Wheel Drive Automatic

any thoughts as to why my 1987 gmc has no power to the fuel pump relay

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Wednesday, April 7th, 2010 AT 10:07 PM

4 Replies

  • Tiny
  • rasmataz
  • Member

Check and test the ECM B fuse if okay test the orange wire from the relay to the fuse holder

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Thursday, April 8th, 2010 AT 2:15 AM
  • Tiny
  • teresaj
  • Member

Fuses check ok but there isnt any power in the orange from the relay to the fuse holder.

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Thursday, April 8th, 2010 AT 2:37 PM
  • Tiny
  • rasmataz
  • Member

The wire is open-you suppose to have power at all times.

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Thursday, April 8th, 2010 AT 2:43 PM
  • Tiny
  • teresaj
  • Member

Ok my bad there was a bad fuse replaced it and now I have power on the orange wire to the relay. Now the switch that changes the tanks in the dash we think is bad. Bought a new one and you have to hold the switch down to make the fuel pump run - the old switch does the same thing.

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Thursday, April 8th, 2010 AT 8:41 PM

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