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Mk3 golf Fuel Gauge - sony
I'm now sure that my petrol gauge is not working properly as no matter how much petrol i put in, it just never shows a reading of how much there should be in. It sometimes goes up a bar then goes down again just as if it couldn't make its mind up. It never seems to go over the half tank mark.
Is it more thank likely that a sensor has gone somewhere, or a relay or fuel gauge sender?

Cheers
Mk3 golf Fuel Gauge - HarlequinVW
If the other guages are behaving normally, it's probably the sender.
Mk3 golf Fuel Gauge - Altea Ego
If your temperature gauge is ok, then its probably the fuel tank sender,
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TourVanMan TM < Ex RF >