Originally Posted by Rubicon2
Thank you Dunrollin for your reply.
I may not have explained myself very well. I was referring to the metal pipe that goes through the frame rail and screws into the tank. It is at the treaded connection on the tank where I believe I have a leak.
I am by far, no expert on this subject but, typically, at least from what I can remember on our fire trucks, the large nipple is welded to the tank. And, a neoprene hose, that leads from the fuel inlet at the body, to the nipple at the tank makes the link between the two. I don't remember any of the nipples "screwing" into the tank but, again, I'm no expert. Are you dead sure you don't have this kind of scenario? There has to be a flexible connected rubber/neoprene line somewhere from the filler port to the tank, maybe two, depending on how long the run is from the filler port to the tank. There may be a short section of flex line from the port, to hard section, and then another short flex section leading onto the nipple on the tank. Just guessing.