Quote Originally Posted by gus 08 mobius lsv View Post
not to hijack the thread but i'm a new boat owner...13 months now. i see vapor lock issue come up now and then what exactly is it and what does the cold water do to help it.
i always have a cooler of water so it seems like an easy solution but just wanna kinda understand what it is and how the water helps. thanks guys
I'm no mechanic, but what I believe happens is fuel pump gets hot enough that it actually vaporizes the fuel inside the pump. This usually happens as soon as you turn the engine off and the pump quits pumping fuel. With no fuel flowing the fuel sitting in the pump actually turns to vapor and when you try to restart the pump can't pull fuel because of the vaporized fuel.

When you spray the pump with cold water the fuel pump cools quickly and returns the vaporized fuel back to its original liquid state allowing the engine to refire.

It usually take about 5-10 minutes after you spray the fuel pump with cold water vs. sitting for 30 minutes waiting for the pump to cool on it's own. Hope that makes sense.

Scott