Noise after engine is turned off
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Noise after engine is turned off
1991 Ford F150 Lariat. I have a noise coming from under the truck after engine is turned off. Its a high pitched whine. Whatever it is, it is draining the battery. Help 
Fleet Mechanic
Joined: Nov 2003
Posts: 1,372
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From: West Cornwall, CT
The noise could be your fuel pump continuing to run after the ignition is turned off. This would kill a battery quickly.
Locate the fuel pump relay - it should be in the power distribution box under the hood generally just in front of the master cylinder. Tap the relay and see if the noise quits. If still noisy, pull the relay. If the noise stops, the problem is the relay.
If the fuel pump is not the problem, you can selectively pull fuses until that mystery noise stops to locate the problem component.
Lou Braun
Locate the fuel pump relay - it should be in the power distribution box under the hood generally just in front of the master cylinder. Tap the relay and see if the noise quits. If still noisy, pull the relay. If the noise stops, the problem is the relay.
If the fuel pump is not the problem, you can selectively pull fuses until that mystery noise stops to locate the problem component.
Lou Braun
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I also have a 1994 F150. When I look at the relays in it they just pull out and are replaceable. The ones in the 1991 F150, where the problem exists, appears to be one big unit. I don't see any replaceable relays.
