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1999 Pontiac Grand Prix Car starts then stalls

Tiny
DRSLAYER
  • MEMBER
  • 1999 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 124,000 MILES
Hi. My 1999 Grand prix gtp with the supercharger will start. Then after 30 seconds to approx 3mins. The car dies out. It acts as if it running out of gas. It was running fine, then about 30 mins after filling my tank the probem started. I have replaced the fuel filter, pump and pressure regulator, but the problem still exsists. It holds 40psi of pressure, then it starts to go down slowly after idling. It goes down faster under load. It has no problem starting up, just staying going. It has also been checked wiith a portable scanner with no error codes showing. Any ideas or help would be greatly appreciated.
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Saturday, May 31st, 2008 AT 6:07 PM

1 Reply

Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
Start car and see if it will hold pressure under hard acceleration then lose the pressure when returning to idle. These cars have a fuel pump resister that limits voltage to the pump under normal driving and bypasses it under hard acceleration. If you have fuel pressure when you are under hard acceleration but lose it at idle then the resister is bad. If it loses pressure under hard acceleration then the pump is bad. Hope this helps
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Saturday, May 31st, 2008 AT 6:53 PM

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