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everyone iv'e ever talked to said it's a ford issue with the sending unit (if your gauge cks out ok). Mine will read full until about half a tank, then read 1/2- 1/4, and then read full until the light comes on and then reads to empty from there....
 
This helped with my fuel gauge at one point. Just take off the fuel line to the fuel rail and wait a second for pressure to drop, which backs down the gauge. Then plug back it.

That helped on mine.
 
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