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Always look at "ACTIVE TOPICS" to see all posts in date & time order as they are sometimes moved; or look at "Your Posts".
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fuel gauge unsteady
fuel gauge unsteady
thanks so much for your replies just to add to the symptom the gauge flickers wildly across all settings and is never stable for a split second only it will stop at what appears to be the amount of fuel I know to be in the tank but then its back to its flickering the problem is without a accurate gauge doing a lot of miles means I am over fueling for most journeys its such a niggle thanks
Re: fuel gauge unsteady
Not sure about your car but my 1964 Jaguar has a voltage regulator that powers the fuel gauge. You may find this needs replacing. I always use the miles travelled on the odometer as an added check as most fuel gauges on old cars are unreliable in my experience.
Trevor
Trevor
Re: fuel gauge unsteady
Raw has an SP, it doesn't have the regulator, it is a 12V stand alone system.
Owner since the 70's, Genghis is slightly to my left.
Re: fuel gauge unsteady
It could either be the sender unit, as mentioned in a similar thread, the wiring or the gauge itself. To help isolate the problem, try a couple of things.
At the fuel gauge, disconnect the wire going to the sender. The gauge should read empty. Now link the disconnected terminal of the fuel gauge to earth (e.g. use a wire to connect back to the battery earth terminal). The gauge should read full. If it's stable, then the problem is downstream of the gauge.
At the sender, disconnect the wire which comes from the gauge. The gauge should read empty. Now connect the wire to an earth point (e.g. use a long wire to connect back to the battery earth terminal). The gauge should read full. If it's stable, then the problem is the sender or it's earth connection. If it's not stable, and the test at the fuel gauge was good, then it's the wiring - possible break or short etc.
Hope this helps - jez
At the fuel gauge, disconnect the wire going to the sender. The gauge should read empty. Now link the disconnected terminal of the fuel gauge to earth (e.g. use a wire to connect back to the battery earth terminal). The gauge should read full. If it's stable, then the problem is downstream of the gauge.
At the sender, disconnect the wire which comes from the gauge. The gauge should read empty. Now connect the wire to an earth point (e.g. use a long wire to connect back to the battery earth terminal). The gauge should read full. If it's stable, then the problem is the sender or it's earth connection. If it's not stable, and the test at the fuel gauge was good, then it's the wiring - possible break or short etc.
Hope this helps - jez
Jez Stow
1960 Daimler Dart
and a few other toys
1960 Daimler Dart
and a few other toys