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If you run the blower while refueling you are constantly removing any explosive gasses and keeping the space below LEL.
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I have to disagree here, if you run the blowers during refueling you are also creating a draft that will suck in the heavier than air gasoline fumes, so you are creating a problem not correcting it.
Yes, you nose (assuming you don't have a cold!
) is the best tool to use, if you smell gasoline vapors don't start the engine!
Type I is commonly called the May West. It's used offshore by the navy and requires training to use.
I believe type II is the type of offshore vest used by recreational boaters because it doesn't require training. If I'm not mistaken Type I is not CG approved for recreational boaters for that reason while Type II is.
My experiences have been limited to Types III and IV