[Eljaro]

regarding the fuel return line I was thinking rather of something that would slowly empty the fuel bowl, like hooked up to the bowl drain screw.

Since I have a mechanical pump with a regulator set to 2.5psi, there is no way of turning it off before stopping the engine.
There also is a buildup of pressure behind the regulator when the engine stops. I guess that the heat in the engine compartement heats up the fuel in the line (or maybe also the air) and the expansion causes the pressure surge.

It can also be that the float valve does not close well. Who sells the D&G valves?
Thanks