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1999 Cadillac STS Fuel pump

Tiny
DOUGLAMA
  • MEMBER
  • 1999 CADILLAC STS
  • V8
  • FWD
  • AUTOMATIC
  • 120,000 MILES
No power to fuel pump, fuse and relay are good. On fuse block at relay, term 87 12v all the time. Term 85 12v for about 2 sec. On the fuel pump 2 elec plugs, 3 wire and 4 wire, which plug is for pump and which wire is the hot wire. Can the fuel pump be hotwired
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Sunday, May 24th, 2009 AT 8:34 AM

2 Replies

Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
The four wire is pump and sending unit, the three wire is pressure sensor. Gray wire pin B is hot from relay, and black pin C is ground.
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Sunday, May 24th, 2009 AT 11:53 AM
Tiny
DOUGLAMA
  • MEMBER
  • 2 POSTS
It was a bad fuel pump.
I disconnected the plug from the pump then used a paperclip to jumper term 87 & 85, this applied power to the plug long enough for me to test for power and a quick plug in, to test the pump.
After removing the pump I checked continuity, open circuit, I also saw why the fuel guage didn"t work, the fingers that ride on the resistor, were worn off
I checked the dealer price 545.00, the best deal on the internet 250.00.
I located a used unit out of an Olds Aurora (98-99) for 75.00.

Thanks again
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Sunday, May 31st, 2009 AT 5:53 AM

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