4o hp 3cyl yamaha shuts off after 30 seconds

[dada]

"Motor starts and runs great f

"Motor starts and runs great for 30 seconds, shuts down like someone hit the kill switch, will restart instantly, run great for another 30 seconds??? It shuts down to fast to be a fuel problem. Any engine protection devices on this engine?"

 

[tom_manning]

Be sure fuel tank is vented.

Be sure fuel tank is vented.

 

[dada]

"Checked fuel system, lots of

"Checked fuel system, lots of fuel."