SubFord - I found your fuel tank selector switch thread searching for the wiring diagram for that switch on my 1977 F-250. I also see that you have a 77 F250. Can you help me track down the same sort of diagram for our truck? We are troubleshooting a dead fuel gauge and have tested a bunch of things including ground at the send units, ohms there, pulsing 5v from the IVR, etc, but cant quite figure out the ins and outs on that fuel tank switch and think since the gauge reads dead on both tanks, and all seems to be in order with the send units, it must have something to do with the path through this switch. The switch does work to actuate the actual fuel tank/line switch solenoid. Switching tanks at the switch works, but no reading on the fuel gauge.
My 1977 only has one tank and it is in the cab behind the seat.
Here is how it is wired, the diagram is for an 1983 but just looking at the fuel select solenoid that is the same except the fuse is F3. Power on tho the solenoid selects the front tank (mid) and with no power it is the rear tank (aft).:
My 1977 only has one tank and it is in the cab behind the seat
Thank you for the response and diagram. Do you know where I should look to find the wiring diagram for the tank switching system on the 1977 F250? I have the Haynes, Chilton and set of 5 pdf versions of this thing's manuals but none has this wiring diagram.
My bad subford > this diagram shows both single and double fuel systems. Note the grey box called"Fuel Tank Selector Switch"...it feeds the gauge from either front or rear tank through the yellow/white wire to connector C208A. That could be the point common to both tanks we're looking for!
[quote=subford;11652239]Location as said above is on the drivers side frame rail under the bed:
Fuel tank selector valve:
Hey Subford, where's the best place to buy this fuel tank selector valve, O'rielly's nor AutoZone don't carry them or they carry a electric type.fficeffice" />>>
Can it be cleaned out, having intermittent problems with it selecting the rear tank pump?
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company.