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That is why the engine compartment must have forced ventilation, using the bilge blower, to remove potentially explosive gasoline vapors before the engine is started and when the boat is moving slowly. Because it may be difficult to remember to turn on the bilge blower every time you slow down the boat, (fig. 3.4.1) ! DANGER Gasoline vapors can explode Before starting the engines, open engine compartment and check for gasoline smell. • If you smell gasoline, do not start engine; get everyone off