I have run a search to find info about startup tanks. I came across an interesting suggestion that, instead of having a clunk line inside, if you feed from the bottom of the tank then you can flip it upside down to clear the lines before disconnecting. This sounds like a very good idea to me.

The question I have regards the overflow tank vent using this method. If this is at the top of the tank then all is fine during normal operation. When you flip the tank upside down prior to disconnection the vent will now be placed at the bottom of the fuel (I am assuming a pipe vent similar to a regular glow tank rather than a hole). Will this cause excessive restriction or will the tank still vent ok through the fuel? (I hope that make sense).

Are there any other methods people use to limit the amount of fuel coming out of the tube after disconnection?