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Volkswagen Golf Mk7 Owners Manual: Things to note for diesel vehicles

Fig. 189 shows the misfuelling prevention device fitted to the fuel filler on some Volkswagen Golf Mk7 diesel models, designed to ensure only the correct nozzle can be inserted. This page explains how that device works and why it matters for protecting the diesel injection system.

Fig. 189 Tank flap open: misfuelling prevention device in the fuel filler

First read and observe the introductory information and safety warnings 

The fuel filler in diesel vehicles can be fitted with a misfuelling prevention device  . The misfuelling prevention device ensures that the vehicle can only be fuelled 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 fuel filler, 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.

    Questions & answers

    Things to note for diesel vehicles — Volkswagen Golf Mk7

    What is the misfuelling prevention device on the Golf Mk7 TDI?
    A spring-loaded flap in the filler neck that opens only when a diesel nozzle is inserted. A narrower petrol nozzle cannot open it, preventing accidental misfuelling.
    What happens if I put petrol in a Golf Mk7 diesel engine?
    Petrol damages the high-pressure diesel injection system. Do not start the engine — have the tank drained and the system flushed by a workshop before any further use.
    Does the Golf Mk7 diesel need winter fuel in cold weather?
    Standard diesel can contain paraffin wax that crystallises in cold temperatures, blocking the fuel filter. In winter, filling stations normally supply cold-weather diesel; if in doubt, ask before filling.
    Filling the tank with petrol, diesel or E85
    Fig. 188 Open tank flap with tank cap attached to the holder First read and observe the introductory information and safety warnings Switch off the engine, ignition, mobile telephone and aux ...

    Capacities
    First read and observe the introductory information and safety warnings    Fuel tank capacity Petrol and diesel engines with front-wheel drive ...

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