ORIGINAL: Pat Roy

1) Silicone line, such as that used for glow engines, breaks down very quickly in gas. Very quickly. Those running gas use Tygon, Neoprene, or Viton fuel lines. Theere are some other specialized gas lines that someone is sure to mention shortly. Just hang tight.

2) There is no need to pressurize the tank using muffler pressure with gassers. The engines have their own pump so there is no muffler line used. The tank simply vents to the atmosphere. Those overly concerned about small amounts of gas escaping from the vent line build a "trap" in the vent line by looping the vent tubing back over the tank and forward again before exiting the plane.

3) Gas engines are not as susceptable to bubbles in the air line as glow engines, but using the Walbro filter shown in the picture reduces the chance of bubbles in the line to an absolute minimum. Typically the fuel remaining in the line on an extended down vertical is more than adequate to keep the engine running. Likely the plane would hit the ground long before the engine started sputtering.