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Take a close look at this manufacturer's drawing. Note there is a fill hose from the deck fill AND a vent hose. Either can be clogged.

Fuel system installation:

http://www.bostonwhaler.com/boat_grap...5328PM.pdf

http://www.bostonwhaler.com/boat_grap...1730PM.pdf

These diagrams are available on www.bostonwhaler.com
http://www.bostonwhaler.com/page.aspx.../page.aspx