I recently installed a fuel level sender into my Jaz fuel cell. The cell is red metal outer and black bladder inner. I cut a hole large enough in the red metal for the entire sender to sit on top of the black bladder, and a hole just large enough to clear the diameter of the shaft that actually goes inside the tank. To mount it, I purchased a 3" OD washer, traced the bolt pattern for the sender, drilled and tapped the washer. Then I screwed the bolts into the washer, and pushed them up through the tank. When I purchased the level sender unit, it came with a cork gasket, that I put between the black bladder and the actual sender. Basically it leaks. More when the tank is full. Anyone know of a way to stop the leaking? Sorry about the pic.