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The fuel pump has been shutting down intermittently.

Tiny
JGRIFFIN1955
  • MEMBER
  • 1999 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 12,000 MILES
I have a 1999 Pontiac Grand Prix GTP. The fuel pump has been shutting down intermittently. Found the voltage at the pump was dropping and eventually shutting down after many hours of monitoring. I have now replaced the fuel pump resistor with and new GM part and relocated. Car has not stalled as of this time, but the pump voltage still seems low. 10- 11 volts cold and 9-10 volts hot. Drops as time progresses and the resistor heats up - the new resistor still gets very warm - almost hot. Can the pump be pulling too many amps and causing the resistor to heat up and eventually shut the pump down?
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Tuesday, December 15th, 2009 AT 9:47 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Its the fuel pump and oil pressure switch that powers the fuel pump after it fires up
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Saturday, March 20th, 2021 AT 7:31 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Double check the ground circuits one (1) at the transaxle stud G129 and one (1) at right door sill G316-makes sure its clean and free of corrosion
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Saturday, March 20th, 2021 AT 7:31 PM

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