Used Mercedes-Benz GLS Fuel Injection Pump

The engine code is the single most important detail for matching a fuel injection pump — it matters far more than the year or badge on the car. You'll find it on your V5C or by running a VIN check, and it's the first thing any breaker will ask you for. Give it to the breaker upfront and you'll get a much more reliable quote.

The GLS first generation (X166) ran from 2016 to 2019, with the second generation (X167) launching in 2019 onwards — these are distinct platforms, so a pump from an X166 will not cross to an X167. Even within the X166 generation there were running production changes, so if you are sourcing a pump that crosses any mid-run revision, confirm compatibility with the breaker against your exact registration before purchasing. The engine code on both vehicles is the surest guide.

Both the 2017 and 2018 GLS 350d sit within the same X166 generation and share the same diesel engine family, so on the face of it the pump should be consistent across those years. However, ancillary and mounting changes can occur mid-production without a formal facelift, so confirm against your registration with the breaker rather than assuming the year alone guarantees a match. Supplying your engine code alongside the year gives the breaker everything they need to be certain.

Yes — these badges indicate different engines with different fuel injection systems, so a pump from a 350d will not fit a 400d or a 63 AMG. The 63 AMG is petrol-powered, while the 350d and 400d are diesel, meaning the pump types are fundamentally different. Always match on engine code, not badge, and tell the breaker your exact code so they can source the correct unit.

Trim level makes no difference whatsoever to fuel injection pump fitment; AMG Line and standard GLS trims use the same mechanical components for a given engine. The trim distinction is purely cosmetic — different alloys, interior finishes, and styling packs — none of which touches the fuel system. What matters is the engine code, fuel type, and gearbox type, so focus on those when talking to a breaker.

No — diesel and petrol fuel injection systems are completely different in design and function, and the parts are not interchangeable under any circumstances. Diesel GLS models such as the 350d and 400d use high-pressure diesel injection pumps, while petrol variants operate on an entirely different system. Always confirm your fuel type with the breaker alongside your engine code to make sure you are quoted the correct part.