F250 2006, Fuel issue on power up

I've had a persistent issue with my 2006 F250 (still in warranty) dying shortly after throttle-up after sitting for a while (more than ten minutes) and only after it is warmed up - has not occured off the trailer cold. It's been through two dealers, both have changed all the filiters, o-rings, gaskets, etc. and the squeeze primer, problem still exist. It will run all day with no problem, stop for more than ten minutes, it will start, run up to plane and die, once I manully prime, it is good to go. The dealers have run diagnostics, say fuel pump is good - not sure they checked it hot. Any ideas before it goes back to a dealer for fourth time same problem?

[boats.net]

Sounds like a vapor lock issue. Check the routing of fuel lines to fuel pump, may be too close to block.

Thanks, I'll check routing.

BobH