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Fuel pressure

Tiny
PSAGELY
  • MEMBER
  • 2003 CHEVROLET SILVERADO
  • 4.8L
  • V8
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
Vehicle is hard to start sometimes cranks first time. I have replaced fuel pump twice, the pressure reads 50. I do not know what the exact specs are.
Can the fuel regulator reduce the pressure? What else can I check to improve the truck starting without having to turn key several times to crank?
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Monday, September 17th, 2018 AT 6:39 AM

9 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning.

What is the 8th digit of your VIN?

There are two pressures one for each. There are 2 4.8.

One is 48-54 and the other is 55-62.

Roy
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Monday, September 17th, 2018 AT 6:43 AM
Tiny
PSAGELY
  • MEMBER
  • 10 POSTS
I will get the answer this evening, cannot get to truck now. Thank you.
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Monday, September 17th, 2018 AT 6:49 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, sounds like a plan.

It is a good possibility that you got the wrong fuel pump.

Roy
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Monday, September 17th, 2018 AT 6:53 AM
Tiny
PSAGELY
  • MEMBER
  • 10 POSTS
Installed AcDelco pump.
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Monday, September 17th, 2018 AT 8:41 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, still depends on the motor. There are 2 4.8 with different pressures for each engine.

Roy
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Monday, September 17th, 2018 AT 8:49 AM
Tiny
PSAGELY
  • MEMBER
  • 10 POSTS
The eighth digit is V.
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Monday, September 17th, 2018 AT 12:40 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
The fuel pressure is too low.

Chances are you got the wrong fuel pump when you bought it. They may not have asked you what you eighth digit was in the VIN.

Roy

Except VIN Z. 385-425 kPa (55-62 psi)
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Monday, September 17th, 2018 AT 2:43 PM
Tiny
PSAGELY
  • MEMBER
  • 10 POSTS
Okay, thank you.
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Monday, September 17th, 2018 AT 2:48 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Roy
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Monday, September 17th, 2018 AT 2:51 PM

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