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Old 07-24-2018, 12:31 PM   #6
City: Seaford Va on Poquoson River, VA
Country: United States
Vessel Name: Old Glory
Vessel Model: 1970 Egg Harbor 37 extended salon model
Join Date: Jan 2016
Posts: 2,185
I have been wondering, why dont they seal the tanks from the humid air?
For Gasoline, they use a VOPR system, vapor over pressure relief, it lets tank vent above 1 psi, and lets air in when motors draws fuel, but most of the time, the tank is not being used, so it will be sealed from outside air. It has made a huge difference on my gas powered boat using the VOPR type cap.

Here is a vpr valve goes into the 5/8 vent line then exits the hull.
This would be used with a vented fuel fill
BK0280025 - Diurnal Control Valve (DCV) 5/8" x 5/8" - Vapor Space Management - OE Boat Builders
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