MAKE SURE THE GAS TANK VENT IS OPEN AND CLEAN.
IT SOUNDS TO ME LIKE YOU ARE SUCKING A VACUUM IN THE TANK THAT IS STRONGER THAN THE SUCTION ON THE VACUUM VALVE THAT FEEDS THE CARBURETOR. WOULD RUN UNTIL THE VACUUM IS TOO HIGH IN THE GAS TANK AND THEN QUIT UNTIL PRESSURE IN THE GAS TANK IS BACK TO NORMAL. MIGHT IDLE BECAUSE IT CAN DRIBBLE ENOUGH FUEL TO THE CARB TO SUPPORT AN IDLE, BUT NO MORE UNTIL NORMAL ATMOSPHERIC PRESSURE IN THE TANK IS REACHED.
SAME THING CAN HAPPEN IN LAWN MOWERS, STRING TRIMMERS, CHAINSAWS, ETC.
intermitant great running
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