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Does anyone have any troubleshooting tips for a 98 Blazer fuel pump?

Tiny
DEVILDAWG710
  • MEMBER
  • 1998 CHEVROLET BLAZER
  • 134 MILES
The pump works when hard wired straight from battery. But when plugged up, it makes a faint click like it wants to start but doesn't have the power to. I am at a loss! Plz Help!
Sunday, October 9th, 2011 AT 1:09 AM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Check the fuel pump relay under the dash in the power distribution block. Let me know what you find.
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Sunday, October 9th, 2011 AT 1:11 AM
Tiny
DEVILDAWG710
  • MEMBER
  • 4 POSTS
I already swithed it with the Horn Relay an still nada
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Sunday, October 9th, 2011 AT 1:25 AM
Tiny
DEVILDAWG710
  • MEMBER
  • 4 POSTS
The fuel pump relay I found is under the hood. Is there another one I dont know about?
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Sunday, October 9th, 2011 AT 1:27 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
If I may add, I would be looking at a bad ground for the control side of the relay. That is the most common failure with these types of issues.

Roy
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Sunday, October 9th, 2011 AT 1:28 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
That is the only relay. Check what ASE mentioned too. If that is good, you need to check if there is power to the relay itself. If there isn't, you need to work your way back all the way to the ignition switch looking for an open circuit.
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Sunday, October 9th, 2011 AT 3:32 AM
Tiny
DEVILDAWG710
  • MEMBER
  • 4 POSTS
The relay is still activating when I turn the key on. Is there a possibility that the power connection out of the relay could be bad? I will also check the grounds to an from. I will also check the voltage to an from. As well as the voltage at the fuel pump connector. That should give me an idea if its losing power somewhere. Correct? Thanks again for the help! Semper Fi!
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Sunday, October 9th, 2011 AT 1:40 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
That is correct.
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Sunday, October 9th, 2011 AT 8:49 PM

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