Confirm the fuel type before driving
Do not guess from vehicle size. A Japanese kei car normally uses petrol, not diesel. Check the rental explanation and the label near the fuel door.
At a self-service station
Stop the engine, touch the anti-static pad, select the correct fuel and follow the machine. Ask staff for help if anything is unclear.
Return with enough time
A full-tank policy may require refuelling near the return store. Keep the receipt and include unloading, inspection and the walk to Iiyama Station in your schedule.