Mercedes-Benz B-Class Fuel Pump Replacement Parts

Yes, all petrol and diesel variants of the B-Class have a fuel pump, as both fuel types require one to deliver fuel from the tank to the engine. Electric variants of the later W247 generation (such as the B 250 e plug-in hybrid) do not use a conventional fuel pump in the same way, but every pure petrol and diesel B-Class does. If you are unsure which fuel system your car uses, check your V5 or run a VIN check before ordering.

Both years sit within the same W246 generation, which ran from 2011 to 2018 with a facelift in 2014, so there is a reasonable chance of compatibility, but fitment is primarily driven by engine code rather than year alone. The engine code stamped on your V5 or obtained via a VIN check is the most important detail to match, as different engines within the W246 range used different pump assemblies. Confirm the exact part against your registration with the breaker before purchasing.

The W245 and W246 are entirely separate generations with different platforms, engines, and fuel system designs, so a direct swap across that boundary is very unlikely. Engine codes changed significantly between the two generations, and the fuel pump assembly will typically differ in dimensions, connector type, and flow rate. Always confirm compatibility with the breaker using both registration numbers.

Trim level does not affect fuel pump fitment on the B-Class; Sport, SE, AMG Line, and Executive trim cars all use the same engine-driven fuel system within any given engine variant. What matters is the engine code, fuel type (petrol or diesel), and gearbox type, not what badge is on the boot lid. Do bear in mind that cars from different trim levels may have accumulated different mileages or service histories, which is worth asking the breaker about when sourcing a used unit.

Yes, the engine code is the single most useful piece of information when buying a fuel pump, because Mercedes fitted several different petrol and diesel engines across both the W245 and W246 generations, each with its own compatible pump specification. You can find the engine code on your V5 logbook, or by running a free VIN check online using your registration number. Supply this code to the breaker alongside your registration to get the most accurate match.

Some Mercedes fuel systems, particularly on newer W246 models, may involve ECU or immobiliser interaction depending on the specific setup, and whether coding or pairing is required on your particular car is something you should confirm directly with the breaker or a Mercedes specialist. This is not something that can be stated as a blanket rule across all B-Class variants, as it can vary by engine, model year, and how the car is configured. Ask the breaker this question explicitly before you buy, and factor any potential programming costs into your budget.