Refueling and Siphoning Fuel
Full jerry cans can be used to partially refuel vehicles in Epoch.
Empty jerry cans can be used to siphon fuel from one vehicle to put it into another.
Land vehicles can also be refueled at gas stations by stopping next to the pumps, or landing on the roof in helicopters.
This video shows how to use jerry cans in Epoch
Note:- Currently boats have to be refueled on land with jerry cans