2001 Yamaha HPDI need help

A problem my uncle is haveing with his first boat is,when the moter is cold it will start ,no problem,when the moter is hot it will start no problem,but when we run some where and fish for a while and the moter is warm it will not start unless we put the moter in nueteral and the baffles open then the moter will start with a couple of trys?
Any suggestions?

I’m not sure if this will help, but I have a Yamaha 150
OX66 that was kind of doing the same thing.
I ended up replacing the fuel pumps on the motor and
the problem went away.
The dealer I talked to explained if the fuel pumps diaphrams
go bad,gas leaks by flooding the motor.
Not sure if this helps but ya might want to check it out.

Thanks Brad ,keep them comeing if any one else have any suggestions.

I think Brad nailed it. I had the same problem on my 175 HPDI… the fuel pump diaphrams developed small holes and the motor would start hard warm and would surge intermittently when running at a constistent speed. LaCannes diagnosed it quickly and got it fixed… never to return.

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I’m not sure if this will help, but I have a Yamaha 150
OX66 that was kind of doing the same thing.
I ended up replacing the fuel pumps on the motor and
the problem went away.
The dealer I talked to explained if the fuel pumps diaphrams
go bad,gas leaks by flooding the motor.
Not sure if this helps but ya might want to check it out.

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I recall the same diagnosis with Dean “Mr. Resort Guy” Marshall’s 150 HPDI. Diaphrams wearing out.

Thanks guys.