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Fuel pump relay problems?

Tiny
MJ0704
  • MEMBER
  • 5 POSTS
I can hear the relay when the is key on but no sound fronm the pump
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Tuesday, August 4th, 2020 AT 12:56 PM (Merged)
Tiny
BUDDYCRAIGG
  • MECHANIC
  • 2,262 POSTS
Is power coming out of the relay?
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Tuesday, August 4th, 2020 AT 12:56 PM (Merged)
Tiny
EDWARDJOSEPHSON
  • MEMBER
  • 7 POSTS
  • 1995 BUICK LESABRE
  • 129,000 MILES
I have a 95 lesbare custom and im having issues with it starting consistantly, as well as staying running once it does start. I took it somewhere and the replaced the crank sensor, but that didnt fix the problem. When it stalls, it feels like the fuel is being shut off. I replaced the fuel pump relay, but im still having the same problem. Any thoughts would be greatly appreciated.
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Tuesday, August 4th, 2020 AT 12:56 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Has PCM been checked for codes? Check engine light on? Has fuel pressure been tested? Recent repairs?
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Tuesday, August 4th, 2020 AT 12:56 PM (Merged)
Tiny
EDWARDJOSEPHSON
  • MEMBER
  • 7 POSTS
The fuel pressure has been tested but I dont always hear the pump turn on when I turn the key. None of the lights are on unless the car stalls. When it stalls the oil, battery, and engine lights come on but when its running theres no lights on. The only thing ive done recently other than what I stated in my question is my front wheel bearings and the water pump and gasket.
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Tuesday, August 4th, 2020 AT 12:56 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Important has PCM been coded? Fuel pressure needs to be tested
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Tuesday, August 4th, 2020 AT 12:56 PM (Merged)
Tiny
EDWARDJOSEPHSON
  • MEMBER
  • 7 POSTS
When I first took it to be looked at they tested the fuel pressure and it passed. Im not sure if they coded the PCM
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Tuesday, August 4th, 2020 AT 12:56 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
O.K. Go to an AutoZone or similar have them check for codes if any post will advise. Was IAC looked at when at shop? Why was crank sensor replaced?
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Tuesday, August 4th, 2020 AT 12:56 PM (Merged)
Tiny
STRETCH1967
  • MEMBER
  • 2 POSTS
  • 1994 BUICK LESABRE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 163,000 MILES
I have a 1994 buick lasabre that I thought had a bad fuel pump but now I believe it may be the relay I have found the location of the relays for the car but there are six relays in that location 5 gray and 1 black and there are no marking to tell which is the relay for the fuel pump how can I find the right one?
To replace

thank you
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Tuesday, August 4th, 2020 AT 12:56 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Hi stretch1967,

It should be at the passenger compartment relay centre, behind right side of dash.

Here is a guide to help you test the relay once you find it from the diagrams below.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Cheers,
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Tuesday, August 4th, 2020 AT 12:56 PM (Merged)
Tiny
EDWARDJOSEPHSON
  • MEMBER
  • 7 POSTS
Will an AutoZone be able to read obd1? They said the crank sensor was pertty worn and could have been the problem. Im not sure what IAC stands for so I cant really answer that lol.
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Tuesday, August 4th, 2020 AT 12:56 PM (Merged)
Tiny
STRETCH1967
  • MEMBER
  • 2 POSTS
Thank you for answering this question the relays I was looking at were on the fire wall under the hood I would not have found the relay center inside if it wern't for your answer thank you again
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Tuesday, August 4th, 2020 AT 12:56 PM (Merged)
Tiny
EDWARDJOSEPHSON
  • MEMBER
  • 7 POSTS
I dont know if they checked the IAC. They did try replacing the mass air flow sensor but that did nothing as well.
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Tuesday, August 4th, 2020 AT 12:56 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
IAC idle air controler if faulty can cause hard start and stalling
Car is equiped with ODB11 has 16 pin connector GM sswitched over in 95
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Tuesday, August 4th, 2020 AT 12:56 PM (Merged)
Tiny
EDWARDJOSEPHSON
  • MEMBER
  • 7 POSTS
Would it also cause it to die out while driving? Its shut down on me several times on the highway as well as stalling from idle.
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Tuesday, August 4th, 2020 AT 12:56 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
IAC would not cause shut down at speed Need PCM checked for codes may have faulty PCM shuting down fuel pump
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Tuesday, August 4th, 2020 AT 12:56 PM (Merged)
Tiny
COLDK9JOE
  • MEMBER
  • 1 POST
  • 1993 BUICK LESABRE
1993 Buick Lesabre 6 cyl Front Wheel Drive 136833 miles

I need to find out which one of the relays is the fuel pump relay.

The relays are located in the maxifuse / relay center which is located on the passenger side of the engine compartment, mounted against the fire wall. There are two fuse boxes, and a row underneath of relays.

Which one of those relays is the fuel pump relay?
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Tuesday, August 4th, 2020 AT 12:56 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hello, my info just says position H for the fuel pump relay, like, abcdefg-. If you can see the wiring colors for the connector, you can double-check, gray-- black with white tracer--red-- dark green with white tracer-- pink with black tracer.

There also should be a fuel pump prime connector behind/around the battery, red wire with connector, nothing plugged into it. If you use a jumper wire and run B+ to the connector, the pump should run, use an inline fuse. That way you can run the pump without using the key, just for testing.
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Tuesday, August 4th, 2020 AT 12:56 PM (Merged)
Tiny
EDWARDJOSEPHSON
  • MEMBER
  • 7 POSTS
Okay ill have to get it checked. Im hoping the pcm is fine ive had to change that within the last couple years as well but this issue is recent. Will post with results for further thoughts if needed.
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Tuesday, August 4th, 2020 AT 12:56 PM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,542 POSTS
  • 1992 BUICK LESABRE
  • 120,000 MILES
How to bypass the fuel pump relay switch on a 1992 Buick LeSabre
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Tuesday, August 4th, 2020 AT 12:56 PM (Merged)

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