No. This puppy will read up and down several gallons and/or around
several "ranges" when the plane is motionless. That seems to suggest a
ground problem.

The common failure modes folks report a float detached, bad ground at
the gauge, bad ground at the sending unit, broken resistive element.

A detached float or bad element would suggest zero readings all the
time. A bad ground at the gauge would make the error follow the gauge,
not the sender (as I have isolated). That leaves a bad ground at the
sending unit. This may be the problem. The statoseal washers did tend to
isolate the mounting screws from the sending unit. The sending unit is
further isolated from the tank via the gasket. Whatever ground I may
have had initially may have corroded/eroded away. I may be able to snake
my arm up the inspection cover for the landing gear to get a grounded
wire on the back of the sending unit.

A new sending unit is listed at $237, however, the usual places don't
have any. Some suggest there are no new ones available. I don't want to
send the thing out for overhaul if it turns out to be defective and I
don't trust boneyard parts for this type of thing (they are ALL worn out
and 35 years old). I would prefer to have a new one, or, if that is not
possible, an overhauled unit standing by for a quick swap.

Thanks,
Mike

john smith wrote:

Have you run the tank dry/drained it and looked at the float/sender with
a flashlight and mirror while moving it with a stick and watching the
fuel gauge/ohm meter?

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