1999 Other GMC Models feul pump

Tiny
STUARTSCUSTOMS
  • MEMBER
  • 1999 GMC
  • V8
  • 4WD
  • AUTOMATIC
  • 125,000 MILES
I have a 99 gmc k1500 with a 5.7 or 350 4x4. We just put in a new feul pump but it had a different electrical connector on it. They sad to match wire colors but they were not the same color. Tried many different combos but none worked. Can't tell if we have power to the pump. Could it be a bad relay or something and do you have wiring diagram for pump plugs? Thank you
Monday, December 24th, 2007 AT 6:32 PM

1 Reply

Tiny
MICKEY-D
  • MECHANIC
  • 304 POSTS
The new pump should have come with better directions. Most are three wire, power w/key on, power while cranking, and ground. If you can figure the truck harness out for the same things, you should be able to make it work.
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Thursday, January 7th, 2010 AT 2:41 PM

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