...fix it before using again! The hose should have a brass fitting on the end that screws onto a matching fitting on the back of the stove. That joint should be sealed with the yellow gas-type teflon tape. If you haven't seen that joint yet you haven't checked a likely spot for the leak. If the stove is gimballed there will be some movement of the hose and stove and that could have loosened up the joint. Having leaked that much gas out I would open up all bilge hatches and make sure you get some good ventilation blowing through there.