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Old 07-21-2009, 03:48 PM
bigmac bigmac is offline
MC Platinum
 
Join Date: Jun 2005
Boat: 2004 Maristar 230 VRS
Location: Central Minnesota
Posts: 8,121
I'm pretty sure (can't find the reference) that NMMA rules require fuel tanks be vented to the outside. Obviously they also have to vent in to keep negative pressure from building in the tank. USCG and NMMA do require that all fuel tank venting be to the outside of the boat - not into any closed compartment.

As I understand posts about problems with these Perko "gas fill and vent" fittings, that two way venting is done through the filler cap.

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