like Teslinhiker, I use a marine bulb type fuel fill system, but add an additional step... I run it completely from an external tank, that once the line is primed by the bulb, runs by siphon (tank above genset)... I've added a double barb in the line to connect the 1/4" carb inlet to the 5/16" supply hoses... the coupling comes apart, and the fuel bowl is completely run dry each time I test the system...