Hi Dave,

I had to give a thumbs up your writing down so many of the ideas of what I would say in this matter
With as much information that you put into your posts, it like reading a textbook from several authors in collaboration. Great job!

When he says he leaves the cap loose that is for sure going to be causing some coolant loss.
I agree with BRUCE S. posting that sealer is never a good thing and besides, I have never seen written how long it’s supposed to fix a leak?
Running a cap loose doesn’t show much faith it it working either.

I have read that gasoline when stored in a boats tank will vent fumes. This is just from barometric pressure changes.
As much as four to eight ounces can evaporate everyday as its sitting on the water being slightly agitated.
The movement in turns imparts energy into the fuel, of which is the same as heating it.
Boats are really sincere about the ventilations of all spaces.

Looking forward to all your posts.

Phil