Vehicle & Technical > Series Land Rovers

Faulty fuel gauge diagnosis

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MisterC:
The fuel gauge on my SIII started acting up, one minute 1/2 full (which the tank was) next minute empty, fluctuating in between on occasion.  It's now fixed firmly at the bottom.  The temp gauge is working fine, so I'm assuming the voltage stabilizer is OK, since that feeds both gauges.  I used my multimeter to check for voltage to the fuel sender supply, with it disconnected from the sender, and this read a constant 11.7ish volts with ignition on.  When I connected it to the tank fuel sender the reading varied wildly from 0 to 9.5ish volts and everywhere in between.  Can I assume from this that the fuel tank sender is at fault?  Thanks in advance.

dave_2A_2.25Turbo:
Sounds like a sound diagnosis to me - the readings should be constant at any given position of the sender

spy:
On almost the same subject, my temp guage hasnt worked since some swine broke in and ragged the wiring behind the dials.  Whats this about a shared voltage stabiliser?  

Any chance someone can give me a monkeys guide to the wires on the back of the temp guage?  :D

dave_2A_2.25Turbo:
Not off-hand.  Mine didn't come with one fitted at all, so I bodged, sorry, modified a capilliary type to fit.

Haynes manual?  If not I've got the wiring diagram on a CD somewhere

hobbit:
After some problems with heating in the disco and thehybrid, the disco was solved and confirmed after fitting a mechanical gauge, to confirm the electrical one was working

On the hybrid, with the s3 electrics, more fun, the fuel gauge is shall I say not very reliable, I take to checking the tank after so many miles. The temp guage the same.

I have now had a new rad in, and the nice man at the rad place kindly fitted a different size thread union in the bleed plug hole, (tdi rad), that now has a mechanical sensor in it, so I can now get a true reading on the machine, feel a lot better, the thought of screwing up a 300tdi engine for the sake of a few quids of temp gauge.

The wiring on these machines are a pain to say the least, the voltages that control the fuel and temp gauges have always been hit or miss, I prefer not to rely on them if possible, I'm sure there are some after market tank measuring devices, one of which could be fitted

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