Electrical Guru's see this post.......
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New User
Joined: Sep 2004
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Electrical Guru's see this post.......
My 88 dual tank F250 has the fuel gauge pegged at full all the time. I took the connector off the midship tank and grounded the wire for the gauge. Nothing happened. I took the cluster out and checked the gauge itself. It does move freely. If I move it to empty and turn the truck on the gauge pegs past full (either front or rear). This tells me that something is grounding out (correct)??
Anyone have ideas on where this could be happening? I have looked the wires in back of the dash and the connector at the tank (midship only - - I can't get to the rear tank wiring) and see nothing. Can the rear sensor ground out both tanks? Would a bad sensor screw the gauge up for both front and back tanks?
HELP before I run out of gas again....... The wife really hates to push while I steer.
Anyone have ideas on where this could be happening? I have looked the wires in back of the dash and the connector at the tank (midship only - - I can't get to the rear tank wiring) and see nothing. Can the rear sensor ground out both tanks? Would a bad sensor screw the gauge up for both front and back tanks?
HELP before I run out of gas again....... The wife really hates to push while I steer.
Senior User
Joined: Feb 2004
Posts: 315
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From: Miami
ford fuel guages work backwards to the rest of the world.
Ford Guages peg to full when there is no ground signal, and empty when the input is grounded.
Check the Fuel tank selector switch on the dash. It switches the guage between the front and rear tanks. If the switch is not working (open) then that would peg the needle to full even if you ground the wire at the tank.
Try grounding the wire that goes from the switch to the guage to see if the needle drops to "E".
A service manual will help you tremendously it tracing these wires.
Ford Guages peg to full when there is no ground signal, and empty when the input is grounded.
Check the Fuel tank selector switch on the dash. It switches the guage between the front and rear tanks. If the switch is not working (open) then that would peg the needle to full even if you ground the wire at the tank.
Try grounding the wire that goes from the switch to the guage to see if the needle drops to "E".
A service manual will help you tremendously it tracing these wires.
