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Yep, I recently repaired a 2008 F450 doing the same thing, the purge solenoid was the fault. The fuel vapors are denser than air and forced the float to sink lower. This truck has a miles to empty readout and it would show considerably less miles to empty when the tank was pressurized. When I was diagnosing it, it would have excessive pressure when removing the gas cap. I wouldn't have thought that it would have been that significant on the gauge, but live & learn.
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