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Fuel pressure spec needed

Tiny
HD2424
  • MEMBER
  • 2003 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 246,000 MILES
Can someone tell me the fuel pressure spec is for my truck listed above 1500 z71?

I need specs for;

Key on engine off.
Key on and engine running.

Thanks
Tuesday, June 28th, 2022 AT 3:46 PM

10 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,740 POSTS
Pressure on this is different based on the VIN. The 8th digit in is the engine code. If you look below, they only provide the pressure when the pump is commanded on. So, that would be engine off. It will drop a little with the engine running, but I wouldn't expect more than 5 PSI.

First, identify the 8th digit in your VIN and then refer to the attached pic.

I hope this helps.

Take care,

Joe

See pic below.
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Tuesday, June 28th, 2022 AT 10:28 PM
Tiny
HD2424
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Yes, tested I had 49 PSI key on engine off and 49 engine running. I guess this this is problem with random misfire.
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Wednesday, June 29th, 2022 AT 5:57 AM
Tiny
HD2424
  • MEMBER
  • 191 POSTS
Thanks for your help got pump ordered.
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Wednesday, June 29th, 2022 AT 5:57 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,740 POSTS
Hi,

You are very welcome. I assume the engine code is not Z. LOL As far as replacing it. Here is a link that explains how in general. If you need any of the specifics, let me know if this is a regular cab or extended:

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

Take care and feel free to come back anytime in the future.

Joe
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Wednesday, June 29th, 2022 AT 9:31 PM
Tiny
HD2424
  • MEMBER
  • 191 POSTS
Extended cab.
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Wednesday, June 29th, 2022 AT 10:22 PM
Tiny
HD2424
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I’ve cut a trap door in bed and can change pump in 10 minutes. I sealed the seams and have a heavy rubber mat that covers the bed. I don’t know why Chevy doesn't build them that way.
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Wednesday, June 29th, 2022 AT 10:33 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,740 POSTS
Hi,

That is the way to do it. LOL Let me know how things turn out for you. I'm interested in knowing if it takes care of the issues.

Take care,

Joe
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Wednesday, June 29th, 2022 AT 11:31 PM
Tiny
HD2424
  • MEMBER
  • 191 POSTS
Will do.
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Thursday, June 30th, 2022 AT 7:19 AM
Tiny
HD2424
  • MEMBER
  • 191 POSTS
Okay, Joe. Heads up changed the fuel pump and fuel filter and starts right up, no more random misfire or knock sensor codes. Test drove over 100 miles on trip I had to make ran great no codes of problems. Thanks for the help.
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Friday, July 1st, 2022 AT 9:27 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,740 POSTS
Hi,

Thanks for the update. I'm glad to hear it's running good.

Please feel free to come back anytime in the future if you have questions. You are always welcome.

Take care and Happy 4th!

Joe
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Friday, July 1st, 2022 AT 9:22 PM

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