open gas tank VOLKSWAGEN BEETLE 2018 Owners Manual

If, however, the malfunction indicator light B also comes on, drive to your nearest authorized Volkswagen dealer or authorized Volkswagen Service Facility and have the fuel system and the engine checked.
WARNING
Driving with a fuel tank that is almost empty can lead to stalling in traffic, a collision, and serious personal injuries.
x When the fuel tank is almost empty, fuel supply to the engine can be interrupted, especially when driving over bumps, across slopes, and up and down hills.
x Steering and braking assistance as well as ESC and related systems will not work if the engine “sputters” or stalls due to lack of fuel.
x Always refuel when the tank is 1/4 full to reduce the risk of running out of fuel and stalling in traffic.
NOTICE
x Failure to heed warning lights or text WARNINGS can result in vehicle damage.
x Never drive until the fuel tank is completely empty. The irregular fuel supply can cause the engine to misfire. This allows unburned fuel to get into the exhaust system and damage the catalytic converter or the diesel particulate filter.
The small arrow next to the gas pump symbol in the fuel gauge ⇒ fig. 135 shows the side of the vehicle with the fuel filler flap.
Refueling

Fig. 136 Right rear side of vehicle: Fuel cap placed on the open fuel filler flap.