fuel delivery issue
i have two glow planes with similar problems. air in the lines. i removed cleaned the tanks. replaced fuel lines. i can blow through the exhaust line and get a good stream of fuel.
checked the muffler.no restrictions.added 2'' hose to exhaust tip to increase backpressure, no change. on the one plane with the engine mounted at 90 degrees the engine dies when nose up. i have adjusted fuel mixture with no change.also replaced glow plugs.