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After replacing the fuel pump it still has low fuel pressure?

Tiny
EDDIE_14
  • MEMBER
  • 2004 GMC YUKON
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
I replaced my fuel pump, but I still have low to no fuel pressure, and my engine will not start.
Saturday, September 30th, 2023 AT 8:27 AM

6 Replies

Tiny
AL514
  • MECHANIC
  • 4,669 POSTS
Hello, do you have dual fuel tanks on your vehicle or just a single? And have you checked for power back at the fuel pump connector? I'll post some diagrams for you to check.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit
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Saturday, September 30th, 2023 AT 9:06 AM
Tiny
EDDIE_14
  • MEMBER
  • 3 POSTS
It’s just a single, and yes it has power, it will pump it just doesn’t have any pressure.
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Saturday, September 30th, 2023 AT 9:10 AM
Tiny
AL514
  • MECHANIC
  • 4,669 POSTS
What pressure reading are you getting with just the key on first prime?
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Saturday, September 30th, 2023 AT 9:23 AM
Tiny
EDDIE_14
  • MEMBER
  • 3 POSTS
It’s okay, my dad finally figured it out, thanks for the information though.
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Saturday, September 30th, 2023 AT 9:24 AM
Tiny
AL514
  • MECHANIC
  • 4,669 POSTS
Okay.
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Saturday, September 30th, 2023 AT 9:26 AM
Tiny
RENEE L
  • ADMIN
  • 1,260 POSTS
Can you please let us know what the issue/repair was, it may help other people experiencing this issue with their vehicle? Thank you!
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Sunday, October 1st, 2023 AT 11:30 AM

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