Air lock in the fuel system on fiesta 250 vee

Hello there. We're getting a persistent air lock in the fuel system on our fiesta 250 vee 2005. The problem seems to be the fuel filler assembly where the fuel line and vent line join together. Should I replace the fuel filler assembly or re-route the vent line to a new over board position? Many thanks in advance for your help. Cheers Mike
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http://rinkerboats.vanillaforums.com/discussion/comment/94476#Comment_94476
Andy