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Misfuelling prevention device on diesel vehicles

Fig. 229 Illustration: misfuelling prevention device in the tank filler neck.

The tank filler neck in diesel vehicles can be fitted with a misfuelling prevention device

that the vehicle can be fuelled only using suitable diesel pump nozzles.

A fuel nozzle that is worn, damaged or not of the correct specification will not open the misfuelling prevention device.

If the diesel pump nozzle cannot be inserted correctly into the tank filler neck, turn the nozzle back and forth while applying light pressure. This

can open the misfuelling prevention device and make it possible to refuel the vehicle. If the misfuelling prevention device remains closed,

proceed to a qualified workshop to have the system checked.

If it is necessary to refuel the vehicle using a spare fuel canister in the event of an emergency, the misfuelling prevention device will not open. In

order to fill the tank with fuel, pour the diesel into the tank extremely slowly in very small quantities.

Fuel types

Introduction

This chapter contains information on the following subjects:

→ Petrol

→ Diesel

Different engines require different fuels. The factory-fitted sticker on the inside of the tank flap indicates the required fuel type for the vehicle.

Volkswagen recommends using fuels with a low sulphur content or which are sulphur-free in order to reduce fuel consumption and prevent

damage to the engine.

If the engine is not running smoothly or begins to judder, this can indicate poor or inadequate fuel quality, e.g. water in the fuel.

If these symptoms appear, reduce the vehicle speed immediately and drive to the nearest qualified workshop at medium engine speeds,

avoiding high engine loading. If these symptoms occur immediately after the vehicle has been refuelled, switch the engine off as soon as it is

safe to do so and seek expert assistance. This can help to prevent secondary damage.

Petrol

First read and observe the introductory information and safety warnings