All the portable tanks I've ever used had a vent in the fill cap to prevent swelling/contracting.
But they always spilled gas when near full so I guess thats why the new tanks dont have them?
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Sold - 1984 V-20 Cuddy with a 2003 Johnson 140 hp gas sippin 4-stroke.
1995 Ranger 250C with a 2015 Suzuki 300 hp 4-stroke.
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