Scan your system for pending faultcodes. Many do not show up as a check engine light, but will be present. Purchase a BAFX OBD2 scanner from ebay, then use any PC laptop and download FORscan (free for personal use) and scan your truck.
99 5.4L New fuel pump, no power/low power to pump
- Thread starter HiTekRdnck
- Start date
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Besides scanning for OBD2 codes, which is your best bet, you would have to do the diagnosis routine, where you measure the fuel delivery system at different points along its path. Don't rule out a faulty PCM either.
But in your case I would definitely suspect the fuel pump relay. Just replace that first, before you do anything fancy.
But in your case I would definitely suspect the fuel pump relay. Just replace that first, before you do anything fancy.
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HiTekRdnck
Member
Thanks and0r. However due to lack of funds I will not be able to purchase the scanner you recommended for quite some time do I will have to go the slow route and check each thing in the process.
Also a note for bedrck47, I was mistaken when I said it was fuse #30. I didn't read carefully enough and only after I posted I realized it was fuse #18 under the hood.
Also a note for bedrck47, I was mistaken when I said it was fuse #30. I didn't read carefully enough and only after I posted I realized it was fuse #18 under the hood.
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OP
HiTekRdnck
Member
The relay has already been replaced
OP
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HiTekRdnck
Member
Thanks to bedrck47 I have all the necessary wiring diagrams for the fuel electrical and corresponding systems
Did you check the fuel module just behind the rear driver wheel well? It should have a protective plate on the frame rail.
Salt and rust will eat components and circuit board due to exposure to elements. Very common issue with 5.4 Im hearing.
Bedrck47
Full Access Members
DISREGUARD the above information The 1999 Expedition DOES NOT have a FUEL PUMP DRIVERS MODULE as stated above
Providing this type of information will only send the OP on a wild goose chase
1955moose
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Kenko, just for the record, fuel pump driver module came only on 2005, 2006, expeditions. It was done away on the 2007 model, thank god. They were mounted underneath by the spare tire, and were susceptible to water, snow, mud, and just about everything else. Another genius boner from our friends at the Blue oval.
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