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[TR] Fuel gauge

To: Triumphs <Triumphs@autox.team.net>
Subject: [TR] Fuel gauge
From: terryrs@comcast.net
Date: Thu, 20 Aug 2015 21:21:45 +0000 (UTC)
Delivered-to: mharc@autox.team.net
Delivered-to: triumphs@autox.team.net
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Thread-topic: Fuel gauge
So, the fuel guage works when I fill the tank.  Registers full.  Then, right 
about 3/4ths of a tank left, it wobbles, then drops to zero. 

Voltage at the sending unit is 12 in and a bit over 4 out.  Voltage at the 
gauge is the same.  Both measurements at the 3/4ths level.

I would guess that the sending unit is simply a variable resister, somewhat 
like the heater fan switch.  I would think that the resistance wire that the 
float rides on might be broken at that one particular point.  ...Except I'm 
getting 4 volts being sent to the gauge.

Am I right that the gauge is faulty?  I don't understand gauges, and why they 
might malfunction at one particular reading (and all subsequent until the gas 
tank is empty).

Thoughts?

Terry Smith, '59 TR3A
New Hampshire

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