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running backwards and fuel back drain with new 2300??????

Old 10-14-2008, 10:36 PM
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Default running backwards and fuel back drain with new 2300??????

Tuning new ST 2300 with bisson pitts muffler. Still doing initial settings and and am having problems with keeping fuel at the carb and the motor starting backwards. Can choke engine and get fuel to carb but it leaks back almost instantly. Also when flipping engine to start it always to start backwards now. Did not do this initially but does almost everytime now. Help please. Also notice alot of swirling and bubbbling inside tank. Too much back pressure maybe???
Old 10-15-2008, 10:32 AM
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Default RE: running backwards and fuel back drain with new 2300??????

When the engine starts backwards, it's usually not fully-broken-in, and it's too rich and/or overprimed. You can get around this with an electric starter or by flipping the propeller backwards.

When fuel rushes back to the tank, it means that the carburetor is higher than the level of fuel in the tank. That's also something that's very normal when that condition prevails. It's due to siphoning. If the fuel level in the tank is higher than the carb, then fuel will tend to flood the carb and engine. The only way to prevent siphoning is to have an empty fuel line and have a loop that goes higher than the top of the tank.

Swirling and bubbling inside the tank usually means that it's being affected by the engine's vibrations. That's known as "fuel foaming". You need to add foam rubber around the tank to prevent it from being affected by the engine's vibrations. On very light airframes and profile-type models, this may well be close to impossible. Use fuel tank with a liner that collapses as fuel is used. That type of tank is totally-resistant to fuel foaming.

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