the smell of raw gas is good!
Like natural gas odor in your house, gasoline is made with a odor to alert you of a problem.
So, If you don't smell anything with out the blower..... is the best way to be.
Running the blower 5 min before starting will air exchange your engine compartment 100 times over, but will never prevent a fire.
Gasoline is most dangerous when you can't smell any fumes, because the gas and air are mixed into the perfect mixture.
When the engines are running, the air intake puts the engine compartment under negative pressure, and the air exchange rate is more then 1000 times the blower.
The problem is..... if you had a fire or even smoke, your want zero air movement, so you don't feed the flames with air.
So, then engines go off, and the blower stays off.
A fire will burn out usually without air supply, and full gas in your tank will not blow up, because its sealed with little air in it.
there are 1000 electrical sparks in your boat, from the spark plugs, to the light switches, as long as the fuel supply is sold, and you don't smell or see drips, your safe as can be.
if you want more protection, you can install a fire suppression system , like hot rod cars, then pop off automatically, and open the extinguisher, in the event of smoke or flame.
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