Barefooter, I hear what you are saying but a lot of our boats (moomba/ supra) have had this problem from the get go. My boat, for example, has done this when in hot weather since I bought it new from the dealer. If I have my facts correct, skiers choice/ indmar started putting two fuel pumps in our boats from 08 until they changed to an in-tank option, to combat the vapor lock problem. None of my previous boats (stern drive) had this problem like I and a lot of guys on here experience. Now maybe the fuel pumps are just junk, but I believe it has more to do with the location that the pumps are mounted and the ability for the engine heat to affect the pump housing and fuel line.

I don't have any mechanical knowledge like you do, it's just what I have experienced and picked up from others on this forum. Also, that is an interesting point on the in-tank fuel pumps- it never would have crossed my mind as a potential concern.