Electrical/battery issue
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Electrical/battery issue
I have a 2005 F-150 supercrew 4.6L with appx 127,000 miles on it. Back in December i took the family to a drive in movie and left the ignition turned to the on position. I jumped the battery and drove a few miles home. The next morning when i tried to start the truck it would not turn over. There was a buzzing noise coming from the fuel pump but not enough juice to turn the truck over. This has happened a few times in the last couple of months but will jump and run fine for weeks at a time. I've taken a 2500 mile round trip to Texas with no issues. I took a 200 mile trip this past weekend and now it will not start. I'm thinking it could be the fuel pump relay? I went to the parts store and bought a relay but it's not the same size as the one in my Haynes Manual. The part from the store is the same size as the bigger relays in the kick panel fuse box but does not match any of the plugs. According to my manual the fuel pump relay should be a smaller relay. any suggerstions?
Logistics Pro
Joined: Jan 2001
Posts: 3,740
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From: Central NYS
This is not where I normally hang out, but I would suggest doing a search of this forum for "FPDM" (Fuel Pump Driver Module) and see if it might be causing your issues.
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Joined: Jul 2008
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How old is the battery? I would start by having it load tested. It may have a weak cell. A FPDM going bad usually throws a P0191 code. A battery won't throw a code, but when it does die the gauges and everything will go crazy as will the PATS.
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The battery about 3 years old. I noticed on the way home Sunday night I had a headlight out. after looking for the fuel pump relay i jumped it off and the other headlight went out. I left it running about 30 minutes to make sure the battery was charged. I checked it again when i got home tonight and it was still charged up. I replaced the headlamps but and left them on for better light while i changed the other. By the time i got the housing off the lights were dimming and battery was completely dead. I'm going to have the battery checked and hopefully that fill fix the issue.
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