The Jerry Can is a vehicle part in Apocalypse RIsing. It is a portable fuel tank, used to refuel any type of vehicle. How much it refuels depends on what kind of vehicle it is refueling. It takes up 2 inventory slots. This is essential to a car, as if the car were to run out of fuel, you could just simply use this to refill it.
It can be refilled at a fuel tank which is normally at a gas station. When you come across a jerry can it is up to the survivor whether to bring it along or not, because sometimes survivors abandon their vehicles when they run out of fuel or get shot up. However, some will destroy their vehicle completely so that no one else can use it.