Mercedes-Benz Genuine Fuel Tank Filler Flap Fits A-Class W177 A1777571700

Part number A1777571700. We take parts off vehicles every week, and this page is updated with a link straight to the part as soon as another one arrives.

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About part number A1777571700

A fuel tank filler flap covers and protects the fuel filler neck and cap on the exterior bodywork. Attached to the vehicle body on a hinge, it sits flush with the rear quarter panel to keep dirt, water and road debris away from the fuel inlet. When working correctly, it opens smoothly when released and latches securely flush with the surrounding panel while driving.

To ensure this is the correct component for your vehicle, you must check that the manufacturer part number matches A1777571700 exactly. On a part like this, the number is usually stamped or moulded directly into the plastic or metal on the inner face of the flap or around the hinge mechanism. Matching this exact number is what determines whether the part will fit.

This flap is commonly replaced due to accidental exterior damage, snapped hinges, or broken latching mechanisms that stop the door from staying closed. When replacing this part, you may also need a replacement mounting hinge, release actuator, or the small rubber buffer stops if the original items are worn or damaged.

About this kind of part: fuel filler flaps

A fuel filler flap is the small painted door over the filler neck, with its hinge and usually a spring or a damper behind it. On an electric or a hybrid car the same part covers the charging socket and is often larger and electrically released. It is painted to match the body, which is why it is replaced far more often than it fails: the flap sits where people lean, and it is one of the few painted parts a careless hand touches every week.

Why people replace one

  • The flap has been creased or dented, usually by being pushed shut against the filler cap or by a knock at a pump.
  • The hinge has broken or the spring has failed, so the flap no longer stays shut or no longer stays open.
  • The paint has faded or the lacquer has lifted, which shows badly because the flap sits in the middle of a large flat panel.
  • The release mechanism or the electric actuator has failed and the flap no longer opens from inside the car.
  • A rear quarter panel has been repaired and the original flap was damaged in the process.

Fitting it

  • Most flaps unbolt from the hinge inside the filler recess, sometimes with the hinge as one assembly and sometimes as a separate part.
  • On a car with an electric release, the actuator and its loom stay with the car and the flap comes off on its own.
  • The seal or the foam around the recess is worth checking at the same time, because it is what stops water collecting in the bottom of it.
  • A flap is supplied in primer or in the colour it was sprayed when new, and a matching finish needs the paint code from the car's own identification plate.

Making sure it is the right one

  • Match the part number. A petrol or diesel flap and a charging flap for the same model are different parts, and so are the versions before and after a facelift.
  • Check whether yours comes with the hinge. Some models sell the flap alone and some sell it as an assembly, and the hinge is often the part that broke.
  • Compare the curvature against your own panel. A flap is pressed to the shape of one body line and will not sit flush in another.
  • Treat a painted used flap as a starting point for colour rather than a match, because it has aged with the car it came off.

What to look for in the photographs

A Part number — Stamped or on a label on the inner face, often under the hinge.
B Hinge — Whether the hinge is included and whether it is straight. A bent hinge is why most flaps no longer sit flush.
C Spring or damper — The mechanism that holds the flap open or shut. It is often what has failed, and it is sometimes a separate part.
D Inner face — The back of the flap, where water sits and where corrosion starts on a steel one.
E Outer surface — Look across the face at a shallow angle. A crease or a dent in a flat panel this small is invisible in a straight-on photograph.

This section describes fuel filler flaps parts in general. The numbers and the photographs above are this part.

Free next-day delivery in the United Kingdom Sent with DPD on a tracked, next-day service. Most mainland addresses are next day; the Highlands and Islands, Northern Ireland, the Channel Islands and the Isle of Man can take a day longer.

Returns Thirty days to change your mind, and we pay the return postage in the United Kingdom and Germany.

Trade and VAT C.E.J Haime Group Limited is VAT registered in England and Wales, and every order comes with a full VAT invoice.

Not sure it is the right part? Send us your registration or VIN and we will check this part number against your own vehicle before you buy.

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