1888a123_Beginner_Dirt_Bike___GICL_Wiki_Dirt_Bike_Parts_List_Function
[Part and Quantity] Gas Tank (1) [Part Number] DR70-147 [Materials] Main tank is plastic because it is light weight and will not react with the fuel. The hose is rubber to allow it to move [Forces] The force from the fuel weight would be 5 lbs or less. The forces exerted on the frame would be in equilibrium [Manufacturing Process] Plastic blow molding because it is a hollow plastic container. Drilling would then be done for holes. [Shape] Seams along the edges lend to blow molding. The shape allows for maximum storage in the space allotted. [Part Complexity] 2 [Function] 
Functional: storage place on dirt bike to hold fuel
Group 11 - Beginner Dirt Bike - GICL Wiki