Roger, would you need another clunk, as its only a fill line? Wouldn't want to see them wrestling around in there and choking each other. I was thinking on the lines of a piece of brass tube turned up towards the top of the tank, like the pressure line with the short piece of fuel line on top. Unless its filled right to the top, the fuel would not siphon back at you when filling. Wait, I think I answered my own question, how would you drain it with the line on the top side of the tank. Well, it was just a thought. As far as quick fuelers go, there is only one thing to fail and that is the O-ring. Put the O-rings on a regular maintenance schedule. Joe