1994 Buick Lesabre Fuel Pump Fuse

Tiny
BKMATTHEWS
  • MEMBER
  • 1994 BUICK LESABRE
Electrical problem
1994 Buick Lesabre 6 cyl Front Wheel Drive Automatic

The 20amp fuel pump fuse keeps blowing. I have replaced the relay checked the oil pressure sensor and the fuel pump is less than a year old. Previously replacing the relay fixed the problem. I have tried starting the car with each of the parts unplugged and the fuse still blows. Any ideas?
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Wednesday, June 24th, 2009 AT 12:58 PM

14 Replies

Tiny
JDL
  • EXPERT
Did you try unplugging B+ at the ignition module? How long since a tune-up?
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Wednesday, June 24th, 2009 AT 1:16 PM
Tiny
BKMATTHEWS
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Unplugged alternator, checked injector wires. What is B+?
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Wednesday, June 24th, 2009 AT 1:37 PM
Tiny
BKMATTHEWS
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New wires 1 yr ago. I think new ignition module at the same time. Is that where the spark plug wires run?
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Wednesday, June 24th, 2009 AT 1:41 PM
Tiny
BKMATTHEWS
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Unplugged a+ b- c at ignition, also unplugged sensor at air intake that leads to fuel injectors. Still blows fuse.
New coil packs 1 yr ago
didnt unplug coil yet.
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Wednesday, June 24th, 2009 AT 3:37 PM
Tiny
JDL
  • EXPERT
B+ is just battery voltage. The ignition module sits under the coil pack, where the plug wires go. The pink wire, carries B+ to the module. The circuit goes hot with the key on. Also, the cam and crank sensor shows to be hall switches, they get feed from the ignition module, something else to unplug. Did you unplug the pink wire at the module?
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Wednesday, June 24th, 2009 AT 3:55 PM
Tiny
BKMATTHEWS
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With ignition module unplugged and relay out the fuse doesnt blow. As soon as I plug in module and turn key the fuse blows. What are the gray relays under the main fuses on the firewall under the hood. It looks like 2 pink 1 gr 1 gr+w 1 gry 1 blk and 2 or enter the leftmost relay(passenger side)
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Saturday, June 27th, 2009 AT 7:48 PM
Tiny
JDL
  • EXPERT
The relay to the passenger side should be the blower motor relay, next, ac compressor relay-- cooling fan relay low speed-- cooling fan relay high speed.
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Sunday, June 28th, 2009 AT 11:32 AM
Tiny
BKMATTHEWS
  • MEMBER
Still having the problem.
I have unplugged everything connected to the relay. PCM, fuel pump, oil pressure sender and ignition control module. When I plug in the computer the fuse blows.
Does the computer supply power to the relay through the grn/white wire?
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Wednesday, July 1st, 2009 AT 4:37 PM
Tiny
BKMATTHEWS
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Grn and wht runs from PCM to relay
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Wednesday, July 1st, 2009 AT 4:39 PM
Tiny
BKMATTHEWS
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Its either that or the gry that goes to the fuel pump and oil pressure sender
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Wednesday, July 1st, 2009 AT 4:40 PM
Tiny
JDL
  • EXPERT
The voltage for the coil side of relay comes from the pcm, green/white wire.
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Thursday, July 2nd, 2009 AT 8:39 AM
Tiny
BKMATTHEWS
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Does that mean the problem is between the relay and the coil? What do I need to check? The fuse blows when I unplug the ignition control module.
Thanks for the help
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Thursday, July 2nd, 2009 AT 9:28 AM
Tiny
BKMATTHEWS
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If the fuse still blows with the icm unplugged its got to be a wire, doesnt it?
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Thursday, July 2nd, 2009 AT 10:20 AM
Tiny
JDL
  • EXPERT
Have you tried using the prime connector to run the pump? The prime connector should be behind the battery or close, red wire, has a connector, nothing plugged into it. If you use a jumper coming off battery voltage with an inline fuse, touch the connector, you don't have to use the key, the pump should run. At least maybe you can rule out that circuit?

Any circuit that you think may have a short in the wiring, make sure the wire is unplugged at both ends and that the circuit is isolated from any other circuit, use a testlite, one end of the lite connected to B+, touch the other end to the wire, if the lite comes, it's going to ground somewhere, you'll have to find it.
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Thursday, July 2nd, 2009 AT 11:24 AM

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