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Old 07-17-2017, 07:51 AM   #11

iantan's Avatar
Join Date: Apr 2014
Location: Aberdeen, Scotland or The Med
Posts: 91

I replaced all mine on my 4600, when filling up with water I'd get a geyser splashing back at me and then once when it happened when filling diesel I decided to change the vents out.

In the 4600 2 are behind the settee and the other two on the port side are behind the fridge.

No issues after doing this.

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Old 07-17-2017, 02:18 PM   #12

Join Date: Apr 2008
Posts: 4,250

Originally Posted by gregorys View Post
What did you do not to protect water from entering the vent?
The fuel vent line is looped with the loop going ABOVE the vent through hull. If water were to push into the through hull vent, it would not be able to climb the loop and dump into the tank. Instead it drains any water back out the vent again.

You can inside the vent from the exterior. The vent line needs to be located inside the hull. The hose reomved from the vent inside. The lock nut ont eh backside of the vent removed. Then the vent is pulled out from the outside.

You can pull the vent hose from teh top of the tank and try blowing into it. Usually the restriction is not complete.

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