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How to Properly Test and Diagnose a Bad Fuel Pump

Any prop that attains 9,000rpm on the ground is best in my experience. Bearings are smooth as glass. Futaba YS F-91 AC 4 cycle engine. Has a brother I used for over 7 years. Newys f-91 ac super charged with pressurized fuel system 4 cycle engine weight 26.45 ounces/ 750 grams.