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The bottom line here is that you can't get complacent with gasoline vapors.
Gasoline has a flash poing of about -40'F compared to diesel that is 150'F and up, (the reasons diesels are hard to start in winter). That means Mako Mike can put his cigerette out in the gallon of diesel. Try that with gas and you'll get hurt badly.
Many boats, especially inboards have the filters in the bilge, along with the engines and tanks. (the bilge being any place under the floor) Leaks can come from anywhere....bad hose, leaking tank, leaking fitting at tank on and on.
The only good thing to do is buy a explosive vapor tester. If you don't want to spend the money, always, always run the blower before starting. AND NOT JUST FOR THE FIRST TIME. Run it for a while before going to the next fishing spot. Inspect the bilge every time before going out and give it the sniff test. Make sure you have a good ventilation system, vent cowls etc. And finally make sure electrical connections are in good order (clean) and don't want to make a spark jump.
SO WHEN YOU INSPECT THE BILGE AREA AND GET A WIFF OF GAS DON'T SAY I'LL GET TO THAT NEXT WEEK, CAUSE THERE MAY NOT BE A NEXT WEEK.
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