As everyone knows, the primary function of the fuel tank is to hold fuel only. Also known as a petrol tank or gas tank, the term is usually applied to the part of an engine system in which fuel is stored and operated (fuel pump) or released (pressurized gas). However, it also provides a safe area for knees to hold while riding, which is an essential point of contact between bike and rider. Motorcycle fuel tanks usually hold about 1.5 – 8.5 gallons of gas, but most have a gas tank with 3 – 6 gallons capacity.