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90 hp 3cly pop then pressure through fuel line

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  • 90 hp 3cly pop then pressure through fuel line

    So I've had a rough idle for a few months, rebuild the carbs,fuel pump, trigger, cdm replaced, flushed tank, replaced cylinder number 3 reed valve comp 125psi through 3 cly. My question is what would cause a pop possible backfire?when this happens there is no fuel coming out of the carbs but instead coming through the fuel lines. I can feel the pressure build by holding the fuel line and at times will spit fuel through 3 way tee near the middle carb.? Also perhaps I rebuild the pump wrong? I will double check the fuel pump. Thanks.
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