'86 F350 Fuel System Problems?
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'86 F350 Fuel System Problems?
I have an '86 F350 flat bed with dual tanks. It has the carbed 460 and a 4 speed trans. I believe the last time it was ran was in '06 and then parked in a barn. The truck has power to the fuel tank selector valve on the frame rail and the dash switch is working, however, you can't hear the fuel tank selector valve or either of the sending units running and there is no fuel to the carb. Is there a way to remove the fuel tank selector valve and test it? Or what else could my problem be?
Thanks a lot any help is much appreciated
Thanks a lot any help is much appreciated
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Joined: Nov 2007
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From: Denver Metro Area, CO
Welcome to FTE. 
Do you know for a fact that you have electric fuel pumps?
See if this thread helps you:
https://www.ford-trucks.com/forums/1...not-start.html
Do you know for a fact that you have electric fuel pumps?
See if this thread helps you:
https://www.ford-trucks.com/forums/1...not-start.html
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Joined: Feb 2010
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From: CASA GRANDE AZ
check the pickups in the tank , they could be rotted ! you could bypass the selector switch , but theres a good chance that it would be shot , you could also change it out to manual valves !
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From: Denver Metro Area, CO
You're not going to be able to hear anything from the selector valve or sending units.
With no power, the selector valve defaults to the rear tank.
I would remove the rubber hose leading to the fuel pump from the tanks and see if you have fuel there, it could be the diaphragm in the pump is dry-rotted.
Check for gasoline in your oil....
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Yes all the other gauges are working, except for the fuel gauge. There is power to the selector valve. fuses and relays are fine. I have a new mechanical pump and all lines leading from it to the carb, I may try to put all that stuff on tonight. So even if the selector valve is not functioning it should still allow fuel to be pumped up to it from the rear tank?
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From: Denver Metro Area, CO
This is why I suggest pulling the hose from the pump, see if there is fuel at that point.
You don't have in-tank pumps, so....
With the key in ACC or RUN (engine doesn't have to be running) pull the electrical lead off the tank sending unit and ground it to the body or frame, the gauge should swing all the way to the right.
Un-ground it and it should fall all the way to the left.
If that test passes, the gauge & wiring are good and the problem is most likely in the sending units.
Someplace in the archives of this forum is a Ford wiring diagram showing the dash switch, gauge, selector valve and sending units.
Search for posts made by 81-F-150-Explorer and you should be able to find it; I believe he's posted it within the last year, might be two.
I have probably put up similar diagrams for different years.
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Put the new high performance pump and new lines and filter on last night and the truck fired right up after fuel reached the carb! The old pump was seized up solid. Now need to do some brake work it has no brakes because it needs new rear wheel cylinders
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