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Fuel pump pressure

Tiny
GREENIE5
  • MEMBER
  • 2002 BUICK LESABRE
What is the correct psi for my car listed above (3.8 liter) fuel pump?
Saturday, April 11th, 2009 AT 4:29 PM

7 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Here is the fuel pump pressure and how to perform the test as well

Key On Engine Off 53-59 psi

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Please run down this guide and report back

Cheers
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Saturday, April 11th, 2009 AT 6:12 PM
Tiny
GREENIE5
  • MEMBER
  • 4 POSTS
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
  • MECHANIC
  • 75,992 POSTS
Yes it does because you are forcing the computer to open the injectors more which will compensate for the weak fuel pump here is guide to help you see what you are in for when doing the job. Your car has a trap door so it is much easier.

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Cheers
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Saturday, April 11th, 2009 AT 6:49 PM
Tiny
TIMOTHY HOLLANDSWORTH
  • MEMBER
  • 1 POST
  • 2002 BUICK LESABRE
  • 180,000 MILES
What is the fuel pump pressure for my car?
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Sunday, July 22nd, 2018 AT 1:57 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Vin K- 53-59 psi Vin I-48-54 auto parts rent gauge see link. key on only
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Sunday, July 22nd, 2018 AT 1:57 PM (Merged)
Tiny
MAXREICHE
  • MEMBER
  • 1 POST
  • 2003 BUICK LESABRE
  • 97,000 MILES
I need to know what is the fuel pressure and vacuum pressure I need to look at it
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Sunday, July 22nd, 2018 AT 1:57 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Fuel pressure should be around 40-45 lbs.

Idle vacuum should be 18-20 inches

Roy
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Sunday, July 22nd, 2018 AT 1:57 PM (Merged)

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