Just another pressure fuel system? No way! This is a modified Sig fueling system that fuels and defuels!

The drawback to pressure systems has been the defueling process. With the advent of Giant Scale and the use of gasoline, it has been impossible to have an effective or lasting system.

The gasoline attacks or softens every known fueling accessory and plastic impeller. Pressure leaks allow fuel to melt plastic pump housings, etc. The inherent dangers of gasoline precludes the use of electric fuel pumps, etc.

With the use of two brass aquarium valves, (one double valve and one single valve), you can preassurize your fuel reservoir for filling or pressurize your fuel tank to defuel it. The single valve allows you to relieve pressure while defueling, and no second fuel can or primer bottle is needed as an additional reservoir.

A first class system would require a heavy-duty metal container with an air valve, such as a bolt-on bicycle valve system, to replace the squeeze bulb. Then a tire pump or your pump for those pneumatic retracts could be used to pressurize your tank enough to last the whole day of flying. Defueling requires you to relieve reservoir pressure, but you are done flying by then anyway, right? Use the pressure bulb only when pressurizing your fuel for defueling.

If you use this system for gasoline, be sure to use only neoprene fuel tubing or one of the new plastic tubing made especially for gasoline. Gasoline really does a job on any of the silicone or surgical rubber tubings, destroying them in minutes.