Here's a few videos about fixing your leaking gas-tank, or a plastic hood ( and other items too) ..... you can get away with using an inexpensive heat gun, and using material from other discarded tanks or buying the same type material "welding-rods" it's most important to use the same type of plastic you're repairing, you can also use alcohol or acetone for final cleaning BEFORE repairing your item, heat-gun nozzles are available on-line........