With no sender hooked up, you should get a full reading. If you ground the sender wire, it should read empty. It sounds like you could have an intermitent open in the wire.

I believe that there is a ground wire that attaches to one of the hold down screws on the sender rim. This should be grounded on the bottom of the floor.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!