Selector valve issue?
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Senior User
Joined: Apr 2005
Posts: 234
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From: burley, idaho, usa
Selector valve issue?
I have a 1984 ford f150 long box dual tanks 4x4 4.9l I have had it for a little bit fill both tanks when I got and the gauge worked for both. Last night I was driving home and was getting low on the front tank so I switch it to the rear but noticed my gauge went to empty...made it home parked it. When I got up this morning started up and got into the warm up cycle I went in and when I came back out it wasn't running and wouldn't fire. I switched it back and got it to fire after alot of cranking and some starting fluid. Is there something wrong with the valve or is it in the switch and what's the best way to test it?
Posting Guru
Joined: Jul 2015
Posts: 2,239
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From: Northeast Ohio USA
The first clue was when you switched the tank to rear and the gauge went to "E"...Then, when you switched to the front tank, it was starved having to prompt with starting fluid, it started. It's not a switch issue, but a tank TX (transfer) valve issue. Are you confident on the tank vents?
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
1986 uses different valves as there are two types, one has 3 ports, t'other has 6 ports
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Senior User
Joined: Apr 2005
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From: burley, idaho, usa
So mine is the 3 port one and none of the parts houses can pull up the part they all pull up the 6 port anyone have a part number for it? Also I think I wanna check wiring on this. Do I look for a powered wire going to it? Is that main wire powered?
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Senior User
Joined: Apr 2005
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From: burley, idaho, usa
Oreily's has it listed as a universal part. it is how ever a BWD part so its not OE Borg-Warner has a life time warranty on there parts. might be able to get my shops First Call rep to replace it. Part# FSV1
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Joined: Jan 2001
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From: Virginia
My old 80 started having problems, and I found if I took the tank selector switch in the dash and moved it up and down rapidly the fuel gauge and everything else would start working. It did this several times over a period of months, so I got rid of the rear tank and just plumbed it up straight to the front tank. I then bypassed the switch in the dash. I never needed both tanks anyway.