[Tigers] fuel gauge

[Mike Michels]

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 at autox.team.net [mailto:tigers-bounces at autox.team.net]
On Behalf Of Thomas Witt
Sent: Thursday, July 22, 2010 9:11 PM
To: tigers at 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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