yamaha 40 hp shuts down after 30 seconds

[mdshore]

I just rebuilt all the carbs still same problem . shuts down after 20-30 seconds. can restart , will do the same thing . ive pumped the ball constantly while running..no difference. i tried spraying fuel down the carbs ,wont stay lit.

 

[moonman60]

1) Sounds like your fuel supply is compromised.
2) Rebuilt carbs, no change.
3) Look for the simple not the complex.
4) go to the fuel pump diaphram next and don't forget the primer bulb.

 

[mdshore]

nope , just installed new carb kit , new fuel pump this am. same problem... i pump the ball and even spray gas down the carbs, it wont stay running.. starts right up again though and gives me another 15 seconds..

 

[mdshore]

ps new bulb and hose . running from aux tank not built in tank .