Used Mercedes-Benz GLS Fuel Pump

Yes, every petrol and diesel GLS variant has a fuel pump — petrol engines use a high-pressure direct-injection pump as well as an in-tank low-pressure feed pump, while diesel engines have a high-pressure injection pump driven mechanically. All GLS models are four-wheel drive, so there are no drivetrain-related exceptions to worry about. The exact pump you need depends heavily on your engine code, so have that to hand before approaching a breaker.

These fall in different generations: the first-generation GLS (X166) ran from 2016 to 2019, while the second-generation GLS (X167) launched for 2020 — these two generations share very little mechanically and fuel pump parts are unlikely to cross between them. Even within the same generation, the correct pump is tied to the engine code rather than the model year, so a direct swap is not guaranteed without matching codes first. Confirm fitment with the breaker against your registration and engine code before buying.

Trim names on the GLS reflect the engine variant — 350d and 400d have different engine codes and different fuel systems, so yes, the pump will differ between these even though they are both diesel models. Trim level in the cosmetic sense (AMG Line, Premium, Executive) makes no difference whatsoever to fuel pump fitment. Always match by engine code, not by trim badge or equipment level.

The engine code is the single most important detail for this part — it tells a breaker exactly which injection system and pump specification your vehicle uses, more reliably than the year or badge alone. You can find the engine code on your V5C logbook or via a VIN check, and it will typically be a six-character code such as OM642 for certain diesel variants. Give this code to the breaker alongside your registration to get an accurate match.

Both years sit within the first-generation X166 GLS (2016–2019), so the engine code is likely to be the same and fitment is plausible, but whether ancillary connections or mounting points changed at any point during that production run is something you should confirm with the breaker against your registration. Petrol GLS models use both a low-pressure in-tank pump and a high-pressure pump, so be clear with the breaker about which one you need. Never assume fitment without the breaker verifying part numbers against your specific vehicle.

The GL (X166, sold as GL until 2016 when it was renamed GLS) and the GLS X166 are mechanically the same vehicle, so if the engine codes match, there is a reasonable chance the pump will interchange. However, the second-generation GLS (X167, from 2020) is a completely different platform and GL-era parts will not carry across to it. Confirm with your breaker by matching engine codes and part numbers rather than relying on the name change alone.