Second Hand Mercedes-Benz B-Class Fuel Injection Pump

The B-Class W246 generation ran from 2011 to 2018, with a facelift in 2015, so a 2013 and a 2016 car sit either side of that facelift boundary. Fitment of the injection pump depends primarily on the engine code rather than the model year, so check your V5 or run a VIN check to confirm your exact engine code, then ask the breaker whether their 2013-sourced pump carries the same code. Ancillary or mounting changes can occur at a facelift, so confirm compatibility against your registration with the breaker before buying.

Yes — the fuel injection pump follows the engine, not the badge or the year plate, so two B-Class cars from the same year can have completely different pumps if one is a diesel and the other a petrol, or if they carry different engine variants. Pull the engine code from your V5 logbook or a free VIN check and quote it directly to the breaker; this single detail is more useful than any other information you can supply. Year is still worth mentioning as a secondary check, but the engine code should always lead the conversation.

No — the trim level has no bearing on which fuel injection pump your B-Class needs. SE, Sport, and AMG Line are specification packages that affect interior equipment, styling addenda, and wheel choices, not the engine or its fuelling components. The pump is determined entirely by engine code, fuel type, and gearbox type, so quote those details to the breaker and don't worry about the trim name.

It can do, particularly if you have an automatic (7G-DCT dual-clutch) versus a manual gearbox, as injection pump calibration and associated fuelling strategy can differ between transmission types on the same engine family. Always tell the breaker whether your car is manual or automatic alongside the engine code to help them match the correct unit. Fitment cannot be guaranteed without checking both details against your specific registration.

The W245 first-generation B-Class ran from 2005 to 2011, and the W246 second generation ran from 2011 to 2018, meaning these are entirely different platforms with different engine families. A pump from a W245 is very unlikely to be compatible with a W246, even if the displacement sounds similar, because the engine codes differ between generations. Confirm this firmly with the breaker by providing your engine code, fuel type, and registration before ordering any part.

Whether a replacement injection pump needs coding or pairing to your vehicle's ECU is something we cannot state as a blanket rule — this varies by engine family and the specific unit involved. Raise this question directly with the breaker against your registration number, and factor in whether you have access to a Mercedes-compatible diagnostic tool or a specialist who can carry out any required coding. Sorting this out before purchase is important, as a pump that needs coding and cannot be coded to your car will not work correctly even if the part number matches.