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2001 GMC C3500 fuel pump

Tiny
SMCFA1941
  • MEMBER
  • 2001 GMC C3500
  • 165,000 MILES
No power to pump. Replaced fuel pump but still no fuel. If I put power to prime cercuit it will run.I need to know how to trouble shoot the fuel cercuit.I have power to the fuse but nothig to the relay. The reason the truck was towed in it had a fire by the fuse panel under the hood. No to much damage to wiring. Repared the wiring harness but still no power to ful pump.
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Wednesday, July 31st, 2013 AT 7:28 AM

2 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
I looked at info for the 8.1L engine. Note the diagram. Check that orange wire for voltage from the fuse block, to the relay, hot all the time.
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Wednesday, July 31st, 2013 AT 10:03 AM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Just to add, In the diagram, splice 101, says to be located at forward lamp harness. Lower left front of radiator support, If you want to check voltage at the splice. I'd have to hunt for the orange wire.
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Wednesday, July 31st, 2013 AT 10:43 AM

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