I highly recommend stuffing your face right in the blower's output vent for a second or two while waiting. Not only will gas fumes be immediately apparent, you can often discover other engine room problems this way since the "standard smell" will become locked in memory and new smells will be immediately obvious. Any new odor should be investigated immediately.
One other safety item one should not overlook: Routinely inspect and replace (as needed) the bilge blower and vent hoses. The blower and vent hoses are designed to route fresh air and draw satle air to/from the bottom of the bilge. If the bilge blower inlet hose is not attached or leaking, the blower will be vastly less effective. If the outlet hose is not attached, the blower will be utterly ineffective.
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