Well, its in my driveway with the water muffs on. While running without the spark plug, I can actually use my hand to plug up the opening and it'll cut
You'll do much better if you'll post your questions in the Mercruiser forum.
1..... a vacuum gauge on a Marine Engine is rather useless.
well said !!
and here is the back of my engine there is 2 spots i guessing for temperature probs one by the top by the lifting hook
and the other is
replaced the quick connect at the tank. solved the problem. thanks for everyones help.