Hi NZ-
With the sender wire disconnected the gauge reads zero so I know
it's not the gauge. So I would guess the sender wire is shorted to
ground, would that make sense?
I think I need to examine the sender again to see if some of
the insulation has deteriorated.


On Tue, 3 Aug 2010 19:42:08 +1200, "Bert van den Berg"
wrote:

Hi Frank,

American fuel senders usually have a high resistance when the tank is empty
and a low resistance when the tank is full. A short on the sender wiring
would make that type of gauge show maximum.

I suggest that you disconnect the sender wire at the sender and see if the
gauge still shows full. If so, disconnect the sender wire right at the
gauge and see if the gauge still shows full. If the gauge still shows full
with the sender wire disconnected from the gauge then the gauge is stuffed.