Hi John

Fuel guages are basically ammeters so connecting a power supply should make the neeedle move. The tank sender unit is a variable resister so this varies the current flowing in the circuit and therefore affects the position of the needle


hope this helps

cheers
Jeremy

Hello Jeremy,
thanks for info,away for a few days but will test on my return.
Cheers
John

please correct me if im wrong but I think fuel senders work on earthing rather than power?? so I would put ignition on and then earth the wire that go's to the sender and if the gauge reads full then the gauge is ok and the problem lies with the sender.... regards john

Yes quite right. I should have made that comment in my reply

cheers
Jeremy

Thanks for your helpful advice Lads. However when I fired up yesterday,miraculously the gauge was working.Praise the Lord !
John