John,
My fuel gauge has been acting similarly for about six months now (ever since
I got the car back on the road). If you find the cause is not in the
sending unit, the next step may be to adjust/calibrate the zero and span
coils in the gauge. Someone from the list (seems it was eight or nine
months ago) sent me a simplified procedure on how to accomplish this. If
you would like a copy of the email describing this procedure, I can probably
dig it up and forward it to you. I've not done it to my gauge yet, as I
haven't procured a back-up gauge in case I terminally screw up this one. In
the meantime, the "measuring stick method" for determining fuel level seems
to be working fine.
Dennis
> -----Original Message-----
> From: John Edwin Pike [mailto:toadhall@pnc.com.au]
> Sent: Monday, December 11, 2000 2:36 PM
> To: Triumph Digest
> Subject: TR3A Electrical Problem - Fuel Gauge
>
>
>
> Gentlefolk,
>
> I am returning to this list after a longish absence, and have
> a query for your
> combined minds.
>
> The fuel gauge in my 3A reads "full" until I've used around
> 3/4 of the tank.
> The needle then comes off the stops, and acts as though the
> total capacity is
> around 3 gallons. That is, when there's about 1 1/2 gallons
> left the gauge
> indicates "half", and when the tank is empty that's what the
> gauge reads.
>
> Being somewhat electrically challenged, my trouble-shooting
> to date has been
> to remove the sender unit, clean the contacts on the
> resistor, and clean the
> various earth contacts. None of this has made any difference.
>
> Problem: How do I convince the gauge that the tank capacity
> is actually 12
> gallons? And do I have a problem with the gauge, the sender
> or the wiring in
> between ??
>
> Any assistance will be greatly appreciated.
>
> John Pike
> TR3A TS 75053 O
> Australia
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