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Old 06-09-2009, 20:29   #1 (permalink)
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1990 F250 D Fuel Gauge issues!

I have a 90 F250 with fuel gauge problems, They read empty on both tanks when full and random at times at varying fuel levels but never right and generally not working at all. Odd thing, when you pull the wire from the sending unit it goes to full, this is wrong it should read empty! I am thinking there is a feed back in the system some place as I have replaced the sending unit and gauge set but still problem persists.
Is it possible for the tank selector switch on the dash or the tank selection mechanical controller could malfunction and cause this problem but still change tanks and function normally beside the reading of content?
Anyone had a problem like this?
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Old 06-09-2009, 21:44   #2 (permalink)
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Re: 1990 F250 D Fuel Gauge issues!

Im not sure what kind of float system they have, but I do know that ford did use brass or copper hollow floats for awhile and they do have a tendency to get small holes in them and sink to the bottom, which would explain maybe why they read empty.
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Old 06-09-2009, 22:23   #3 (permalink)
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Re: 1990 F250 D Fuel Gauge issues!

I did think of that as well and one of my first repair attempt was to change the front sending unit in the tank but the end result was still the same. Still has full tanks with harness removed from the sending unit which is backwards to what it should be, replace harness on sender and back to empty.
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Old 06-09-2009, 22:25   #4 (permalink)
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Re: 1990 F250 D Fuel Gauge issues!

'87-up reads FULL for open circuit (disconnected); EMPTY for short to ground.

Yes, the dash switch can affect the gauge without affecting pump operation, and it's common. No, the mechanical switching valve has nothing to do with the gauge. At a time when you KNOW how much is in the tank, measure resistance from the fuel level terminal to the ground terminal on the tank. It should be 160 Ohms (full) - 16 Ohms (empty)
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Old 06-09-2009, 22:37   #5 (permalink)
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Re: 1990 F250 D Fuel Gauge issues!

Good to know I was using the 86 manual! Appreciate the good advice and will have a go at it in the AM
Thanks.
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