Thanks to all for helpful info. It turns out that the rheostat wires had
unraveled and were moving back and forth as the contact wiper travelled
across them. This resulted in dead spots and no wires at all at the "empty"
end of the travel. The sender is the type with a plastic float (which was in
fine shape) that clips into the wire arm. No evidence who made it.
I was able to get a Smiths sending unit, the type with a much larger metal
float and counterweight. The rheostat and general construction of this type
is much more robust, and it works accurately.
-----Original Message-----
From: tigers-bounces@autox.team.net [mailto:tigers-bounces@autox.team.net]
On Behalf Of Thomas Witt
Sent: Thursday, July 22, 2010 9:11 PM
To: tigers@autox.team.net
Subject: Re: [Tigers] fuel gauge
Two issues I've had with senders (beyond a float - that doesn't):
1. The same varnish that can build in a carburator can build up on the wire
resistor and act as an insulator. Lightly sanding it with fine paper
restored contact.
2. I haven't seen the Tiger sender, but there have been times on other
senders where the moving metal parts have been used to carry the electric
signal - and at times won't. A trick I learned racing slot cars back in the
'70 was to solder a flexible wire near the wipe point on the arm to the
connector that transfers the electric signal outside of the tank.
CAUTION use minimal heat I have also lost the seal doing this! JB weld did
the fix.
Tom
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