Does your model have the plastic covers around the fuel/water separator?? I know some do and some don't - and those that did, and were not reinstalled will vapor lock as well.

not a coil problem boat runs great, just shuts off while comming up on plane.

not sure where these plastic covers are that you are refering to? I don't think I have them I'd have to look?

I think he is refering to the plastic cover over the cool fuel device.

Wish I had those covers. I wouldn't be having these problems

they have the parts listed as #13, #14, and #15 in the pic.

Part numbers are : 807956T, 807806T, 807807T

Thanks I will check on those covers mine dosen't have them.

Some have them from the factory - some don't. All I know is they are there with the Cool Fuel system and if you don't put them back - they're known to vapor lock...

Sounds like you have already talked to the guy I was going to suggest, he is on one of the local boards and seems to have that same problem (with the Boss 302). I think he solved it by buying a Cig Top Gun

These has to be some common denominator tho, because if this problem was more prevalent then everybody with a 502 would be having similar problems...