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Fuel gage

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I only have experience with automotive fuel gauges, but I assume a boat works the same way. They work on electrical resistance from the sending unit in the tank. A specific resistance value represents a full tank, a different specific value represents 1/2 tank and so on. You can use a multimeter to check the resistance at the sending unit.

Of course, the first things to check are the obvious: is the gauge plugged in? Is the sending unit plugged in? Is there a loose ground?

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Can you get to the top of the fuel tank?  If so, disconnect wires from fuel sender.  Turn ignition on.  Touch wires together.  If fuel gauge pegs you have a bad sending unit.  Replace with generic teleflex unit and you'll be all set.  If touching wires together and pulling them apart does nothing to the gauge, then you have either a wiring problem or a bad gauge.  

Chances are it's the sending unit.

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