2002 Volvo penta GXI-D 5.7L cannot warm start

2003 Cruisers Yacht 3075 problem, Every morning it is start normally and working good, but after I back to slip and shut down the engines, and it will be not start when I want to start again. But after few hours, it will start smoothly again.


I already change the manifold, riser. And all the spark plugs, and also checked the oil pump pressure (they are normal), I ask few technicians to check the problems, all of them said engine is working good, and don’t know why it can not start sometimes.


But when it can not start, I gave it some gas by putting the throttle to neutral and pushing to go almost full throttle while trying to start with the key. It is able to start this way with heated engines. As said before, the engines cold start well.


Who meet same problem? Would you like to help me.


My engine is 2002 Volvo penta 5.7 GXI-D


Thank you very much

Could be like vapor lock. Don't know your engine, but on other engines, I've seen fuel rails overheat when a hot engine is stopped and it causes the fuel to boil, forcing fuel into the return and leaving an air space in the rail. So on restart there's not enough pressure in the rail for the injectors to put out fuel.
If it is a type of vapor lock, the solution is better engine box ventilation, maybe insulate the fuel rail or add a 12v fuel pump.