Does the vapor lock appear only on the go fast boats or does it happen on cruisers with fuel injection as well.
Is there any system that appears to do it more than another ( cool fuel 1-2-3)

As I mentioned previously, our old boat was terrible about this - never could predict when it would happen. We boat on the Ohio, and my wife was almost too scared to get in it after it happened a 2nd or 3rd time (within about a month of owning the boat).

I sucked it up and paid about $400 for the Merc fuel primer pump kit. Install was very easy and straightforward, although there were no instructions. Other than mounting the pump bracket to the stringer and assembling the fuel line, it included a harness that was plug and play. This was on a Cool Fuel 502 MPI in a 2000 Fountain Fever 27'.

The problem never happened again - I sold the boat out of state, but it ended up about 20 miles away from me. The new owners have my email, phone number, and know where I live (they looked at the boat before I sold). I trust that if it has ever happened to them, they would have contacted me for advice.

Bottom line - the Merc kit fixed my problem. ...it was a VERY frustrating experience. And for piece of mind, I'd highly recommend sucking it up and buying the kit. Or you could piece together something too, I guess (maybe cheaper). My understanding is that the return line doesn't meet CG requirements - but I never confirmed. I needed to get my wife comfortable in the boat first and foremost.

My (additional) .02

I didnt buy the kit, but my understanding is that this is a secondary pump to boost pressure to the cool fuel pump that stay's in place, the wiring harness is in parallel with the EFI harness, when the key is activated both pumps come on, could be wrong

Am I correct with understanding that the merc pump kit is only for cool fuel models? What do those of us with VST need to do then?

Here is the Merc bulletin http://www.boatfix.com/merc/Bullet/99/99_07.pdf

This is what you need - the fuel pump kit.

Us VST guys are screwed, return lines are a shot,, I tried and it made it better but not 100%. Bob Teague also wrote an article on this as well.. I'm going with the aeromotive pump change. Ditching the VST and mech. pumps.. Eddie Young was a wealth of info on how this is done..

Thats what I've been looking for, whats the basic outlay? Mine is a 95

I was worried about it too but I called Eddie young and he said it wouldn't cause any issues. Put 24 hrs on boat this summer!! No issues and ran great!

I bought the kit for my 25ol b/c I had vapor lock issues, when I bought my 33, I came across a thread from Eddie that fixed the issue. Since I had an extra bung in my tank, I tried the return line fix so I didn't have to spend another $7-800 to fix this one.

The kit came with a booster pump that has a y connection to split power from the pump in the cool fuel. Pump screwed right into filter head and fuel line from tank.

Save your money and run the return lines. I used 3/8 marine hose and fittings. Easy!!!

http://www.offshoreonly.com/forums/g...apor-lock.html

Best thread on this

Read pocketchange22 solution in this thread.

A1000>rail>regulator>tank

Work in a filter too of course

Seems like the ultimate solution.