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I have a 2010 yamaha 50 four stroke and the past couple of times while fishing the engine has choked down on me several times each day. It may happen first thing in the morning or after being run for ten minutes. When i check the gas bulb there is no pressure built up. I disconnect the fuel line from the engine press in the ball bearing squeeze the bulb and it acts there is air in the line. Once i get gas coming back out and plug the fuel ine back in it runs fine until the next time. It does it at all RPM's.