This sounds like a possible answer to my issue. I did have some tuff landings. I did however, take the advise give in in this thread about holding the plane noes up and shaking it. I could here the clunk rattle about. So I think it extened now. But it may not stay that way. The tank came pre built (ie the clunk was already installed) so I didn't inspect to see how it was installed. Also, I don't think it has a spot for a third line but that's easy to find out. I can easly remove the tank and see.