fuel guage not reading right
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Joined: May 2004
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fuel guage not reading right
hi all! I just bought a 1988 f350 with the centurion conversion ! nice truck! But the fuel guage reads only two levels - FULL and EMPTY! this truck has dual tanks with the electric switch and it does it with doth tanks. this leads me to believe that it is in the guage area, but the needle will float thru the face of the guage within about 30 seconds going down the road, so it doesnt seem to be a bad guage. 
any ideas where else to look? i have some experience with electrical systems but this one has me buggered!
BTW - all three fuel pumps have been replaced recently by the previous owner,but i dont know if the problem was prior to that.
any ideas where else to look? i have some experience with electrical systems but this one has me buggered!BTW - all three fuel pumps have been replaced recently by the previous owner,but i dont know if the problem was prior to that.
Logistics Pro
Joined: Jul 2003
Posts: 3,595
Likes: 52
From: Lawton, Oklahoma
Hard to tell, but maybe the slosh module in the guage is going bad (provied it is equipped with one). Generally speaking on most Ford vehicles, if you are full and it reads empty there is a short, and if you are empty and reads full you have an open circuit. So I guess it would depend on whether the gauge is reading too high or too low and to what extreme. Eratic reading often is a guage/slosh module if you get the same from multiple tanks. Fuel guage problems can be a pain to isolate.
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