Fuel pump pressure

Tiny
GREENIE5
  • MEMBER
  • 2002 BUICK LESABRE
Six cylinder.

What is the correct psi for my car listed above (3.8 liter) fuel pump?
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Saturday, April 11th, 2009 AT 4:29 PM

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Tiny
RASMATAZ
  • MEMBER
3.8 liter.


http://www.2carpros.com/forum/automotive_pictures/12900_fuel_pressure_38_1.jpg

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Saturday, April 11th, 2009 AT 6:12 PM
Tiny
GREENIE5
  • MEMBER
I have the K engine Thanks for the PSI info. My psi is 43 at idle to 49 at about 2000 rpm, must be my hesitation problem, although when I unhook my MAP sensor car seems to run fine. Heard that low fuel pressure will bring up a MAP sensor code. Does that sound logical?
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Saturday, April 11th, 2009 AT 6:38 PM
Tiny
RASMATAZ
  • MEMBER
Hesitation:

Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor.
Bad TPS (throttle position) sensor.
Bad or dirty MAF (mass airflow) sensor.
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump).
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve).
Bad gasoline (fuel contaminated with water or too much alcohol).

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs.
Bad plug wires.
Weak ignition coil.
Wet plug wires.
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Saturday, April 11th, 2009 AT 6:49 PM

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