Finding Fuel
Fuel was a huge part of life before the infection and still is after the infection. You will need fuel to transport yourself around the islands in vehicles and you will need lots of it to operate airplanes and helicopters! But fuel is in short supply so be economic and get ready to fight for it sometimes.
You can find fuel lying around in various buildings in small jerry cans (20 liter capacity) or large jerry cans (80 liter capacity). Sometimes you may find jerry cans that are empty and you will need to fill them up. You can fill up empty jerry cans at fuel tanks or at fuel tanker train cars.
Approach the tank with an empty jerry can in your inventory and select 'Fill Jerrycan' from the action menu.
After filling the jerry can you will see a message on your screen letting you know how many liters the jerry can has been filled with.
Crafting Large Jerrycans
Draining Fuel
You can also drain fuel from other cars if they have any.