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No power to fuel pump

Tiny
TAMMIS1218
  • MEMBER
  • 2000 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 215,000 MILES
For about a week when I drive my truck it felt like it needed a kick in the butt. I start it and sounded like it didn't have oil. But it does. So one day started it drove it for half hour, came home for fifteen minutes. Went to start and it turned over but did not start.
I replace the fuel pump relay. The ECM b fuse was blown so put new one in. Still would not start. I could not hear the fuel pump prime when I turned on key. But then by passed the relay and pump works.
I was told could n oil sending unit (pressure switch)?
I'm kind of lost about that.
I need some ideas or answers.
Please
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Tuesday, January 8th, 2019 AT 1:45 PM

10 Replies

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

You need to do a manual test of the fuel pump to see if it is providing any pressure.

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

I attached a wire diagram as well for you to view. the oil pressure switch was for the older models.

Roy
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Wednesday, January 9th, 2019 AT 3:48 AM
Tiny
TAMMIS1218
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  • 7 POSTS
Fuel pump works.
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Wednesday, January 9th, 2019 AT 11:03 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, now you need to find out why with the wiring diagram.

You need to go to the relay and remove it and test for voltage as in the diagram I sent you.

Roy
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Wednesday, January 9th, 2019 AT 12:10 PM
Tiny
TAMMIS1218
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  • 7 POSTS
Well now I have had a scan put on it and it shows up short to ground.
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Saturday, January 12th, 2019 AT 3:02 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
No, this is a manual check. A scan tool is not going to tell you the issue.

What do you mean to tells you short to ground? Was there a code?

Roy
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Saturday, January 12th, 2019 AT 5:18 AM
Tiny
TAMMIS1218
  • MEMBER
  • 7 POSTS
When he looked up " why would my airbag light be on" and that is when it came up short to ground.
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Saturday, January 12th, 2019 AT 12:29 PM
Tiny
TAMMIS1218
  • MEMBER
  • 7 POSTS
So if it is manual could you please explain how to do the testing?
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Saturday, January 12th, 2019 AT 12:30 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Was there a code for the airbag system?

The light comes on when there is a fault detected. There are about 100 possibilities for this issue. That's why I need a code. Just because the light is on does not mean there is a short to ground.

You can have a parts store read the code for you for free. Once I know the code I can help you further.

Roy
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Saturday, January 12th, 2019 AT 12:39 PM
Tiny
TAMMIS1218
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Okay, let me see if I can find someone to do that.
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Saturday, January 12th, 2019 AT 12:45 PM
Tiny
ASEMASTER6371
  • MECHANIC
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Sounds like a plan.

Roy
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Saturday, January 12th, 2019 AT 12:55 PM

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