Hmm, I think you're right. I need to check what's on my vent line when back at the boat - I thought it looked like a check valve but now I think it may be something like the Attwood vent line surge protector (prevents fuel from spilling out the vent line when filling the tank).
I thought it was a non-return valve (like used with bilge pumps) but now realize that's probably impossible - air needs to enter to prevent a vacuum from forming as fuel is burned, and exit for tank expansion or filling the tank. The vent line is looped up about a foot however and the vent thru-hull is a fuel tank vent (very small hole) which should hopefully be enough. Attwood has a number of interesting products actually, including a p-trap vent which is supposed to completely prevent water entering: http://www.attwoodmarine.com/store/category/fuel/fuel-tank-vents On Tue, Oct 27, 2015 at 5:07 PM, David Paine <paineda...@gmail.com> wrote: > 4) Does your fuel tank vent line not have a check valve in it? (1-way >> valve to allow air egress but prevent water ingress) Or was the check >> valve not working? >> > > No check valve and in any case, a check valve allows flow of air or water > in only one direction. If it were put in correctly the fuel couldn't get > out but displacement air and water could. >
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