The Portable Gas Can is an Uncommon Fuel Canister in Unturned 3. It is used to fuel vehicles and Generators.
When the Portable Gas Can contains a % of fuel, it can be used to fuel an object. When used to refill an object, the Portable Gas Can is emptied and needs to be refilled at any fuel reserve type located at various places around the map. Every Portable Gas Can spawns with a % of gas, but never 100% (unless on easy mode) so the Player will need to refuel it when they first find one.
The Portable Gas Can is found in Mechanic buildings, in the garages of some civilian houses, and is rarely dropped by mechanic zombies.