2001 GMC C3500 fuel pump

2001 GMC C3500
165,000 MILES
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SMCFA1941
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  • 1 POST
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.
Jul 31, 2013 at 7:28 AM
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JDL
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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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Jul 31, 2013 at 10:03 AM
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JDL
  • ✓ASE Certified Mechanic
  • 16,098 POSTS
  • ASE Certified Mechanic
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.
Jul 31, 2013 at 10:43 AM
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