Re: intake tube broken
Should be expelled out of a vent cover connected to a hose that looks just like that one. You should be able to hold your hand over it and feel air being pushed out. If that blower vent tube is cracked also, you might just be blowing air back into the bilge, which obviously wouldn't help expel gas fumes. You should be able to see a plastic tube-shaped device inline with one of the vent tubes, often attached to the rear of the boat on the transom.
I always sniff the exhausted air for gas fumes before I try starting the boat. I sniff in the engine compartment itself.