The gauge sweep is normally an indication that the battery may be on its last breath. As for the fuel issue, take care of the battery first then we'll tackle the other. Dieing batteries do weird things to cars.
Best thing to do is check the battery with the engine off and then on. Engine off voltage should read between 12.5 and 12.8 VDC. With the engine running it should be between 13.5 and 14.8 VDC.
Mac
Best thing to do is check the battery with the engine off and then on. Engine off voltage should read between 12.5 and 12.8 VDC. With the engine running it should be between 13.5 and 14.8 VDC.
Mac