Posted by Steve@Advance on May 19, 2021 at 08:00:54 from (24.182.105.128):
In Reply to: Fuel Gauge posted by WNYBill on May 19, 2021 at 06:13:17:
Has it always been this way?
If it's always been off, could be a mismatch between the dash gauge and the sending unit resistance range. A common problem with aftermarket gauges.
Try grounding the wire from the gauge. It should go to full, return to empty when ground removed. If not the dash unit is bad.
As said, run a known good ground wire to the sending unit flange.
If that doesn't fix it, pull the sending unit, manually put it through the motions, see what the gauge does.
If it works manually, probably the float is hitting the side of the tank, something is not allowing it to move the full range, the arm is too long, etc. Some have adjustable sending units for different tank depth and float arm length.
If the gauge doesn't agree with the float position, bad sending unit, or mismatched to the gauge.
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