dual tank problem
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New User
Joined: Apr 2006
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dual tank problem
i have a 93 f1504x4, dual tanks, and i cant run off the front tank. the selector switch works so its not an electrical problem, but i cant find the 3-way, or is it 6-way valve that is supposed to be on the truck. anyone know where its located? is there anyway i can test the fuel pumps as well? i tried turning the key to see if i hear the pumps pressurising the lines, but i cant hear either one even tho i know the rear works. any help would be appreciated.
Elder User
Joined: Sep 2003
Posts: 641
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From: Louisiana
The selector switch is dual function. It tells you the fuel in the tank and turns the pump on. You don't have a selector valve. Your truck has what is called a Fuel Delivery Module(FDM) and it's mounted on top of the tank and incorporates the sending unit and pump and return valve.
Elder User
Joined: Sep 2003
Posts: 641
Likes: 1
From: Louisiana
https://www.ford-trucks.com/forums/s...d.php?t=476082
Check that link to another thread. The diagram is for an earlier model, pretty much the same other than wire color changes and you don't have the in-line hi-pressure pump.
Check that link to another thread. The diagram is for an earlier model, pretty much the same other than wire color changes and you don't have the in-line hi-pressure pump.
Elder User
Joined: Sep 2003
Posts: 641
Likes: 1
From: Louisiana
It probably is. But at least it's the front. The rear one is the real "BUGGER". You can purchase the whole unit or just the pump. Do a search in this forum, you'll find alot of threads with links to where owners purchased them.
Elder User
Joined: Sep 2003
Posts: 641
Likes: 1
From: Louisiana
If it's the front tank it's pretty easy, just burn of as much fuel as you can, losen the 2 retaining straps til the nuts are flush with the ends of the bolts, tip the tank down. On top you'll see the 4 pin connector and 2 fuel lines. Disconnect the lines and the connector. On outer part of the circle, you'll see a ring with some tabs sticking up. Take a hammer and a punch and tap on the tabs moving the ring in a counter-clockwise rotation until the ring pops out(about 1/2" movement). Then try and lift the FDM out, it may take a little prying to get it loose. Becareful of fuel that may still be in the unit when you take it out. There should also be what's called a Quad ring(square shaped o-ring) underneath the lip of the FDM. Your replacement one should come with a new one.
