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2002 Chevy Impala fuel pressure

Tiny
THOMAS SHERO
  • MEMBER
  • 2002 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 86,000 MILES
At times when pushing down on the gas pedal the car will act like its out of gas. After 300' feet it will take off like normal. I checked the press with a guage and found that wit key on, not running the press 46 and goes up to 51 slow and stops. Ar idle it reads 44. After off for 1 hr. It goes down to 7. Is it a bad regulator or fuel pump? Its a 3.8 v6 eng.
Thanks
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Saturday, May 16th, 2009 AT 11:14 AM

1 Reply

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hello, my info shows key on engine off fuel pressure, 53-59. Idle-43-56. What does the pressure gage do if you quickly open and close the throttle? If the pressure drops more than 2 psi, there is a supply side problem, filter--pump--clogged fuel line?

You might pull the vac line off the regulator, see if there is any gas in the line. With the vac line off and engine idling, I believe the pressure should go up a little?

I believe the pump manufacturer will give you a bleed-off spec. That bleed-off spec sounds too fast to me?
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Saturday, May 16th, 2009 AT 11:48 AM

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