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Old 05-15-2010, 09:16 AM   #1 (permalink)
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Default Audi 80 Temp Gauge and Fuel Gauge

Hi all,
I know that this has probably been covered a million times already, but before I rip my dash and fuel tank apart, there is a question I would like to ask.

My fuel gauge does not work, but the low fuel warning light is glowing on the dash permanently. Does this mean that the tank sender is definitely at fault, or does the warning light run off the dash gauge ? If the warning light being on means that the tank sender unit is faulty it would save a lot of time.

The temp gauge moves about 1mm up the scale when engine is warmed up and that's all. There are two senders I can see, a blue 2 pin, and a grey 3 pin. Anyone know which is for the gauge?,

I have replaced the voltage regulator and no difference.

Many thanks, Karl.
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Old 05-17-2010, 12:47 PM   #2 (permalink)
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Hi Karl...welcome to the forums. Glad to have you aboard. Your problem does sound like a faulty fuel sending unit and it sounds like you might have a faulty temp sensor aswell. Replace both of those which you should be able to find cheap online, and you should be golden after that. Good luck and post back. Cheers!
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Old 05-20-2010, 02:49 PM   #3 (permalink)
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Thanks for the reply.
I replaced the thermostat as I had an unused spare, and it made the temp gauge move another 1mm ! Guess it is the sender.

I also removed the fuel tank sender connection from the top of the tank, put 9v through it and the gauge on the dash jumped into life.......I assume that proves that it must be the tank sender.

Any tips on how to get the sender unit out of the tank?
thanks, Karl.
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Old 05-21-2010, 06:51 PM   #4 (permalink)
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Good job Karl. Replace those to units and ur rockin.
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Old 08-21-2010, 03:47 AM   #5 (permalink)
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I'm having a similar issue. Both gauges go simultaneously on and off randomly. A loose contact somewhere, maybe?
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Old 08-23-2010, 04:16 PM   #6 (permalink)
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Do the same thing as told Karl and you guys should be ok. Cheers!

Greg!
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Old 08-23-2010, 04:50 PM   #7 (permalink)
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I didn't have to replace it. I tried E85 for the first time today and apparently it helped unclog the fuel tank sender. Both gauges work reliably now.

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Old 10-10-2010, 06:11 AM   #8 (permalink)
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Finally nailed the problems.
Removed the fuel sender unit......it was broken. The wire had snapped. Replaced with new one from Audi (57 !!)

Removed the coolant sender unit and replaced with new one.....sorted (sort of). Engine now reads 107 degrees when warmed up, but temp is actually only 90 degrees, so temp gauge just a bit too optimistic.
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