The fuel policy defines how you pay for fuel and specifies whether you will be required to fill up before returning the car.
The option we recommend is Full/Full, so the car will be delivered to you with a full tank and on return you will have to make sure you return it full. This is the most commonly proposed formula from various companies but there may also be different fuel policies.
When customising the trip, you will be able to see the fuel policy associated with each car in the details section.