Honda 6.5 hp on a pressure washing machine. Runs on only pure gas - no ethanol - starts and after long warm up will accelerate to normal operating rpm's. After 3 - 5 minutes for no apparent reason, the engine will die. This is under full operating rpm's and with the pump at max volume. Sometimes I can release the handle to disengage the pump and the engine may recover. If not it will start on the first pull, don't even need to choke. Have run several tanks of fuel with Seafoam just in case there was any residue in the carb. Hasn't helped. any and all advice from your experience is much appreciated.