I have Suzuki 2005 DF140 efi. When the motor sits in the summer sun for a hour or so the motor starts fine but after 30 seconds of running the motor kills, Then I must prime the gas bulb for the motor to start. After that it runs great until its sits back in the summer sun .

Sounds like your getting vapor lock. It could be under the hood from heat build up or if the fuel line is black and sit out in the sun. I would try and wrap some towels around the fuel lines first to see if that helps the problem.