The blower was in use and just shut off like the switch had been turned off. Gas tank was full. I use sta-built marine so I don't think it is the gas. Checked the plug, there is fire and compression. I tried spraying carb cleaner in the carb and under the plug, still nothing. The plug is firing a blue while arc and the compression was strong. Cleaned the in tank filter. Still nothing. Checked the muffler, it is tight. When the primer is pumped, I can see gas moving in the lines. Any thoughts?