1988 Buick Regal fuel pressure

Tiny
TY VAUGHN
  • MEMBER
  • 1988 BUICK REGAL
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 75,000 MILES
Fuel pressure goes to within specs as soon as key is turned on, but, drops to zero imediately. The pressure is ok at idle but can't keep up during W.O.T.

Thank you!
Monday, January 26th, 2009 AT 9:51 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
When the fuel pump is turned off or stops running, the system should hold residual pressure for several minutes (look up the specs to see how much pressure drop is allowed over a given period of time). If pressure drops quickly, the vehicle may have a leaky fuel line, a leaky fuel pump check valve, a leaky fuel pressure regulator or one or more leaky fuel injectors. Low residual fuel pressure can cause hard starting and vapor lock during hot weather.
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Monday, January 26th, 2009 AT 10:08 AM

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