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Fuel pump relay problems?

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Thepcm turns thepump on why would you wantto bypass this circuit? If it'snot working then find the short or poor connection between relay and pcm and fix it.
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Tuesday, August 4th, 2020 AT 12:56 PM (Merged)
Tiny
BEVIS79
  • MEMBER
  • 1 POST
  • BUICK LESABRE
I have a 91 Buick LeSabre Custom that will rotate but not start also, it makes a click noise by the ECM. It has 3/4 tank of gas. This morning it started and 3 hours later it did not. I replaced the fuel pump relay today. I had the fuel pump put in 1and 1/2 year ago and have not let my gas go under 1/4 tank since. Please help me.
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Tuesday, August 4th, 2020 AT 12:56 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Sorry for the late reply.

If it cranks good but won't start, have a helper crank it while you visually check for spark at the spark plugs. If spark everywhere, check proper fuel pressure and fuel injector pulse.

As far as the noise your hearing, might be a relay or even an hvac actuator that has a problem?
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Tuesday, August 4th, 2020 AT 12:56 PM (Merged)
Tiny
REDNILLA
  • MEMBER
  • 3 POSTS
  • 1992 BUICK LESABRE
V6 front wheel drive automatic 199,000 miles.

Engine cranks does not start, no sound of fuel pump hum at key on and car has been sitting for a year. Where is fuel pump fuse and relay located? If fuel pump fuse and relay test good can fuel pump be removed without dropping tank? How?
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Tuesday, August 4th, 2020 AT 12:57 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Fuel pump relay is behind right side of dash in fuse/relay center. Check fuse number six in the same center. The tank unit cant be done with the tank in the car, sorry, needs to come out.
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Tuesday, August 4th, 2020 AT 12:57 PM (Merged)
Tiny
REDNILLA
  • MEMBER
  • 3 POSTS
Thanks for the information and I assume you are referring to the fuse/relay bank under the hood on right side? If yes, great and you stated to check fuse number six, and it is good. Which relay? Anyway to test the relay?

Appreciate the response!
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Tuesday, August 4th, 2020 AT 12:57 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
According to my software there is a fuse/relay panel under the dash on right hand side. Might need to remove the plastic panel to gain access.
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Tuesday, August 4th, 2020 AT 12:57 PM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
I attached the location of the fuel pump relay with a diagram for future reference. Please let us know if there are more questions. Thanks
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Tuesday, August 4th, 2020 AT 1:36 PM

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