Izzy On the gassor in the first picture that little short fuel line hanging below and facing into the wind is acturallly the fuel tank vent. With a gassor there is no vent line from the tank to the muffler needed because of the pumper type carburators used. But you still need to vent the fuel tank to atmosphere otherwise the carburetor would not be able to pump the fuel if the vent was closed off. I chose to loop it above the tank then down and out the bottom and facing forward.

Also note when I made that photos a few years back I simply grabbed the glow fuel can to illustrate the fueling system and of course you will need a fueling system that does not use silicon fuel line but one of the alternatives that is gasoline resistant.

The orange/black airplane is one of my old warbird pylon racers one that I used for the bronze class and it has a TT.61pro on a quarter wave pipe. For the Gold class I used YS. The airframe is started as a Pheonix Strega from Tower and it was designed for a 135 degree mounted .46 engine not the full inverted that we were forced into to get clearance for the pipe as it was to long to clear the wing.

To answer your question Yes that installation had all the syphon problems associated with a fuel tank/spraybar relation ship that had the tank to high. This was partially resolved by actually cutting a trough/tunnel in the top of the wing to allow the fuel tank to sit a lot lower. I will post a picture of that a bit later if you like as I can get to the spare long wing and it cut sheeting only between the spar and the leading edge spar.

Also note that the hemostats had to be on that loop of line at all times right up to the starting gun and one last note these engines were never idled only about half throttle until launch and the remainder of flight was full throttle until the flag and then the throttle moved to the idle cut off for landing (far eaiser to land without the engine on).

John