Is it leaking? If so are you sure it's coming from around the gasket. I had a simuliar problem but found out I had a pin hole break right at the base of the pipe coming out from the sending unit. When I was putting the line to the front on I pulled on the pipe to tighten it and caused a leak by breaking the lead loose around the area going into the tank. I also have used superglue on the gasket and line up all of the holes, they have to be perfectly lined up with the holes on the unit. I do this before going under the car with the sending unit. Hope this helps.:anim_25: