Refilled by a quarter or more of the fuel tank capacity within three months. | No action to be taken. |
Refilled within three months, but the fuel amount was less than a quarter of the fuel tank capacity. | Refill it by a quarter or more of the fuel tank capacity with fuel.* |
Not refilled within three months but refilled within six months by one-half or more of the fuel tank capacity. | Refill it by one-half or more of the fuel tank capacity with fuel.* |
Other than the above. Or, fuel properties, refilling timing, or the fuel supply amount is unknown. | Extract fuel in the fuel tank and replace it. |