Abstract: A vent device for marine vessels with internal fuel tanks, comprising an upper embodiment that is attached through a vessels hull and a lower embodiment that is attached to the fuel tank. Together they permit fumes to vent into the atmosphere while containing the fuel that usually expels during fueling. This fuel is automatically directed to return back into the fuel tank. This venting device while allowing air to enter, protects against rain, splash, spray and insects from entering the fuel system.

Abstract: A fuel fill port device which contains overfill and prevents spillage, mounted by means of a flange through the deck or gunwale on pleasure boats or other marine vessels with internal fuel tanks. The device prevents spillage during fueling by means of an internal storage chamber, an internal sleeve, an independent tube and an independent compression spring located within the port device which together create a unique structure, which prevents overflow spillage during fueling by means of the device temporarily containing and storing the overfilled fuel and automatically flowing the stored fuel into the fuel tank. This is accomplished by strategically aligned chambers, sleeves, tubes and a spring which causes both the alignment and misalignment of positioned holes that when misaligned forms a storage chamber and when aligned forms a conduit directing the stored fuel into the fuel tank.