Where is the fuel tank switch for the 1986 F 250 pickup ? I just bought the truck used & can't seem to find the selector switch.

Try another fuel filter.If you have a carburetor,change the filter in it,if fuel injected,clean injectors.

You just have a ground problem between the frame and tank ground. It has to be connected to a clean tab on the tank at the fuel sending unit. Check and clean them, both tanks. It gets confused and don't know what to do without a complete circuit.

Some of the pickups (Similar) have 2
1 in tank
1 on frame

check fuses and relay.

Most pickup based motorhomes have 2 fuel tanks, you may have a tank selector valve that is electric or vacuum operated. Check underneath and follow the fuel lines from the tank to the front of the engine, somewhere in between you may find that the fuel hose goes to a valve that is used to switch between the 2 tanks ie: main fuel tank and auxillary fuel tank.

fuel pump IS NOT in the tank, it is between the turbo & the filter housing in the valley

Removal & Installation To Remove:

1. Properly relieve the fuel system pressure.
2. Drain the fuel tank through the filler pipe.
3. Support the fuel tank.
4. Remove or disconnect the following:
   • Negative battery cable
   • Filler neck
   • Shield and tank straps
   • Fuel lines and vapor hose from pump and tank
   • Electrical connection from fuel pump
   • Fuel tank
   • Fuel pump/sending unit assembly by turning the locking ring (located on top of the fuel tank) counterclockwise using a spanner wrench
   • Fuel pump from the fuel lever sending device

To Install:

1. Install or connect the following:
   • Fuel pump in tank with new seal around opening
   • Tank and connect fuel lines and vapor hose
   • Tank to the frame
     1. Torque to: 33 ft. lbs. (45 Nm)
   • Shield
   • Fuel filler neck and clamp
   • Negative battery cable
2. Refill the tank.
3. Run the engine and check for leaks.

I'd say either the gauge is wrong or your pickup tube on fuel pump has a hole in it, about half way up. i believe you have access from luggage compartment. Disconnect battery & pull it out & have a look.

You most likely have a bad fuel pickup or a bad changeover switch if its dual tanks. Also like I have said before, one of the most common reasons for any fuel issue with this year is the fuel and wire connections on top of the tank that lead to every major part of your fuel system. No one wants to drop the tank or reach up and disconnect the switch to check. So I get these trucks for close to nothing from people like you and run them forever, after I spend a day replacing the needed wiring or pickup. to remove anything you must drop the tank or take a chance of breaking something. If you are uncomfortable doing this. I may be able to give detailed instructions. [email protected]

did u check the fuses? A gas pump has a fuse, maybe u blew it, check that first.