Shouldn't have to drain it either. On my 73 and 75 with the rear left
corner raised I can change the sender with nearly 1/2 a tank. My full and
empty readings are a little higher than Tim's, but of the same order. If
you DO change the sender check the calibration of the new sender at 'E'
ASAP. The first time I changed mine it still showed 1/8 tank when it
spluttered to a halt.
----- Original Message -----
From: "Tim Economu" <economu@whidbey.com>
To: <mpountney@primus.com.au>
Cc: "MG List" <mgs@autox.team.net>
Sent: Wednesday, January 16, 2002 4:08 PM
Subject: Fuel gauge sender testing
> Smithy from Oz..... says:
> > I wish i could get my fuel guage to work..it either registers full or
> > empty.........never in the middle......
> > suppose one day I'll have to pull the sender unit , after draining the
> > tank of course. The last sender unit I replaced was in my Cessna
> 172.....At
> > least thats in the TOP of the tank!!!!!!
>
> Well you don't mention year, but on my 69 BGT, the resistance from the
> sender is 20 ohms full tank and 250 ohm empty. Just put a Fluke meter on
the
> sender (disconnect one wire going to meter for accuracy) and you can
verify
> the readings. That will tell you if the problem is the sender. Since the
> sender could be getting stuck at either full up or full down positions,
that
> is my guess. Only takes a minute to test!!
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