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Fuel System

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Beej

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I am thinking about the fuel system on my project. I did plan on using the flop tube as the only fuel source, but more than one person has said to me 'what if the flop tube hangs up after acro?'. So, the option is to add another source below the tank separate from the flop tube with a fuel selector for Acro/Normal/Off. My question is, has anyone ever heard of a flop tube getting trapped, resulting in gas starvation and an engine-out?
 

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