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Fuel pressure at 90 psi

Tiny
JMOCK
  • MEMBER
  • 1995 PONTIAC TRANS AM
  • 5.7L
  • V8
  • RWD
  • AUTOMATIC
  • 95,000 MILES
Fuel pressure high. Change regulator, it starts but shuts off. Bleed pressure to about fifty starts and runs if keep bleeding pressure.
Wednesday, February 15th, 2017 AT 9:30 AM

4 Replies

Tiny
STEVE W.
  • MECHANIC
  • 13,584 POSTS
Sounds like the regulator is faulty or the return line back to the tank is blocked or both. Should be around 45-48 psi. 90 will work the pump to death.
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Wednesday, February 15th, 2017 AT 10:10 AM
Tiny
JMOCK
  • MEMBER
  • 6 POSTS
Have change pressure regulator remove return line no gas coming out of return line.
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Wednesday, February 15th, 2017 AT 10:58 AM
Tiny
JMOCK
  • MEMBER
  • 6 POSTS
Figured out fuel rail plug with dirt.
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Wednesday, February 15th, 2017 AT 12:47 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,584 POSTS
That will do it. But, I will bet it is not dirt as much as fine rust and rubber from the fuel tank and lines. I would plan on replacing or cleaning and sealing the gas tank, then flushing the lines (replace any rubber lines) and you should be okay. What you are seeing is the effect of ethanol on rubber and steel.
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Wednesday, February 15th, 2017 AT 2:44 PM

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