Quote:
Originally Posted by Brian Baker
The issue has crept up slowly on my Can Am in the last 15 years or so. It started out as reading full until it got to about 1/2 tank and then the needle would begin moving toward empty, but never going past the 1/2 tank mark on the gauge (that is to say I never let it go past 1/2 before filling it up, and it always took 18-20 gallons). Now it seems the needle doesn't move at all. It's pegged at full.
Is this a faulty ground, or a faulty sending unit? I plan on dropping the tank soon for inspection (and replacing of rubber hoses from tank to hard lines).
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Brian, find the sender wire near the trunk. Ground the wire to a body ground with the key on. If the gauge goes to empty, the gauge and harness is good. It should read full with an open circuit or high resistance to ground. Most likely the sender is your problem however, remember that the sender drops to empty with ground so you want to make sure your tank is well grounded.