Using a Self-Service Gas Station in Japan: Fuel Colors and Payment Steps

Check the car before you enter the station#

The safest place to identify the fuel is the rental car, not the pump. Before entering a station, open the fuel door or read the label inside it. The rental paperwork or vehicle manual may also state the fuel type. Check the label again if you are driving a different car from the one you expected.

Do not use the vehicle’s size as a shortcut. A small car is not automatically a diesel vehicle, and the Japanese word 軽油 means diesel fuel; it does not mean fuel for a kei car. The pump may also show Japanese names that are easy to confuse when you are tired:

Pump label	English meaning	Nozzle or hose color when shown	What to do
レギュラー	Regular gasoline	Red	Use only when the car’s fuel label says regular gasoline
ハイオク	High-octane gasoline	Yellow	Use only when the car’s fuel label requires high-octane gasoline
軽油	Diesel	Green	Use only when the car is a diesel vehicle

As of September 2026, JAF’s English driving guidance lists these colors when nozzles or hoses are colored at Japanese self-service pumps. Treat color as a second check, not the first one: read the car’s fuel information and the Japanese label next to the nozzle before you select anything.

Find the self-service pump and park safely#

Look for セルフ or セルフサービス at the station entrance. Some stations have both self-service and attendant-operated pumps, so do not use a pump that is not marked for self-service. Pull up on the side of the car where the fuel door is located, leaving enough room to handle the nozzle without stretching the hose.

Before you start the payment screen:

1. Put the car in park and turn off the ignition.
2. Close the windows and doors.
3. Unlock the fuel door from the switch inside the car if needed.
4. Keep children away from the fuel port and handle the nozzle yourself.

Fuel vapour can ignite. Do not smoke or use a lighter, including the car’s cigarette lighter, anywhere at the pump. If the station’s posted instructions differ from this general flow, follow the station’s instructions and ask the attendant.

Select the fuel and payment on the pump#

The order varies by station, but the decision is the same. On the pump screen, select the payment method, the fuel type shown on the car’s label, and the amount or 満タン (full tank) option if the screen asks for it. For a rental return, follow the rental agreement’s full-tank requirement; do not assume that a partial fill is enough. A screen may offer Japanese and English, but do not confirm a choice just because the price looks familiar. Read the fuel name and compare it with the label inside the fuel door.

After the selection, wait for the station’s safety confirmation if the pump requires it. Touch the anti-static mat before opening the fuel cap. If no mat is available, touch a metal part of the vehicle to discharge static electricity. Only then remove the cap and take the matching nozzle.

Insert the nozzle securely into the fuel port. Pull the trigger until it clicks and let the automatic shut-off stop the flow. When it stops, return the nozzle to its original holder, close the fuel cap and fuel door, and take the receipt if you need it for the rental return record. Do not keep pulling the trigger after automatic shut-off: fuel can overflow. If you chose an amount rather than full tank, confirm that the amount matches your plan before leaving.

What to do when something does not match#

Stop before refueling if any of these checks disagree:

What you notice	First place to check	Next action
The fuel-door label and pump choice do not match	Fuel door and rental paperwork	Do not select the pump option; ask the attendant
You cannot read レギュラー, ハイオク, or 軽油	Text beside the nozzle and English screen	Use the color only as a cross-check and ask staff
The nozzle will not fit or the pump will not start	Fuel type, fuel-door position, and pump instructions	Do not force it; ask the attendant
You selected the wrong option before pulling the trigger	Pump screen	Cancel or stop and have staff correct it
Fuel has already gone into the tank under the wrong choice	Attendant and rental-car contact	Do not start or restart the engine or drive away; report exactly what was dispensed and wait for instructions
Fuel spills or overflows	The station attendant	Stop, keep away from ignition sources, and tell staff immediately

If automatic shut-off activates immediately and you cannot refuel, JAF advises consulting the attendant rather than repeatedly trying. The same rule applies when the receipt, amount, or fuel selection is unclear: keep the car stopped and ask before leaving the pump.

A three-check routine for rental cars#

Before you press the final confirmation, say the choice to yourself using three checks: “The car label says [fuel]; the pump says [Japanese name]; the nozzle is [color, if shown].” If the checks agree, continue with the normal self-service steps. If one does not agree, show the rental paperwork or fuel-door label to the attendant.

At the end, check that the fuel cap and fuel door are closed, the nozzle is back in its holder, and the receipt is in your records. Fuel rules and payment methods can differ by station, so ask the attendant rather than guessing when the screen, label, or nozzle does not make one clear choice.