Hi,
i went for a ride last night and now this morning the gauge is reading empty even though i filled the tank, it seems to move a few mm when ignition on but doesn't show fuel level.
Its probably the float sensor in the tank that has stuck down....it could well free itself but if it doesnt, look at the top of the petrol tank and where the wires go in is the top of the sensor. It could be held in with a few screws or by other means though - not sure!
