I've followed all of your discussions in the past year and learned a lot. Now I need some help. I have a 1986 32' Hatteras flybridge sport fish with a confounding gas engine problem. At cruise and trying to get on plane the rpms drop from 3200 rpms to less than 2500. After running a while I can't get it past 1800rpms upon attempting to plane. Tried the following: Switched carbs, replaced all fuel lines, emptied gas tank replaced with new fuel, new fuel pump, all new fuel filters, wrapped fuel line to insulate from heat. Nothing worked. Its definitely a fuel problem because it runs fine in neutral up to high rpms. and problem only occurs under load.I think it may be a vapor lock, but thought that
insulating the fuel line would diagnose the problem. Any help out there? thanks for everything.