Recently acquired a 1961 Johnson 10hp motor. Work primer until feel pressure then try to start as per directions on motor. Will not start. Work primer until feel pressure, then continue to prime another 5-6 squeezes and motor will run for 15-20 seconds then die. Do the same process and can also run engine at higher RPM but engine will run for shorter time. Pulled fuel pump apart and no tears in diaphragm or residue from old gas or ethanol. Best next step is to re-build carb?
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