Mercedes-Benz GLS Fuel Tank Replacement Parts

These two vehicles fall in different generations — the first-generation GLS (X166) ran from 2016 to 2019, while the second-generation GLS (X167) launched for 2020, so the two are not the same platform and a direct swap is very unlikely. Always confirm with the breaker against your registration, as tank shape, mounting points, and sender unit connections can differ significantly across that generation boundary. Never assume fitment without verification.

Engine code matters far more than the badge here — the 350d and 400d use different diesel engines, so confirm your exact engine code from your V5 or a VIN check and supply it to the breaker. Within the same X167 generation, the tank itself may be shared across diesel variants, but ancillary components such as sender units and filler neck connections can differ, so route that specific detail to the breaker to confirm against your registration. Do not assume fitment based on fuel type alone.

The X166-generation GLS received a facelift in 2019 shortly before the model was replaced, and while structural tank changes across that facelift are not a well-documented wholesale revision, mid-production ancillary and mounting changes are exactly the kind of detail you need to confirm with the breaker against your registration. Supply your engine code and full registration so the breaker can check their donor vehicle matches your year and spec precisely. Naming the facelift boundary is useful context, but whether the part physically crosses it is something only the breaker can verify against the specific unit they hold.

The AMG GLS 63 uses a high-output petrol V8 with its own engine code, while the 400d is a diesel — different fuel types alone mean these tanks are not interchangeable, and the AMG variant may also have distinct tank geometry to suit its drivetrain packaging. Always supply your engine code to the breaker rather than relying on the badge or trim name. Fuel type is one of the clearest fitment boundaries for this part.

Trim level does not affect fuel tank fitment on the GLS — Sport, AMG Line, and other trim grades fitted to the same engine in the same generation share the same mechanical underpinnings, so the tank itself is determined by engine code, fuel type, and generation rather than trim. You may find cosmetic differences in how the filler flap or surround looks between cars, but the tank is a mechanical part that follows the engine, not the badge. Confirm the engine code with the breaker and trim can be disregarded for this part.

The single most useful detail you can supply is your engine code, found on your V5 registration document or via a VIN check — this tells the breaker far more than the year or trim name alone. Also confirm your fuel type (petrol or diesel) and which generation your car is: the first-generation GLS is the X166 (2016–2019) and the second-generation is the X167 (2020 onwards). Whether ancillary components such as the sender unit or mounting brackets from a donor vehicle match yours exactly is something to confirm directly with the breaker against your registration, as these details can vary mid-production.