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Mercedes-Benz · Fuel System

Fuel water separator (diesel)

The bowl under the diesel filter that collects water out of the fuel, with a drain and often a sensor.

How you know it is this

  • A water-in-fuel warning
  • Rough running or a car that will not start after a fill
  • Visible water when the bowl is drained

Worth knowing before you buy

  • Water is what destroys diesel high-pressure pumps and injectors, and this is the only thing standing between the two.
  • Drained at every service, and worth draining sooner in a car that stands.
  • Ignoring a water warning is the most expensive economy available on a diesel.

What we need to quote it. The engine code. The chassis number settles the generation, the body and usually the engine in seventeen characters — it is on your mulkiya. A photograph of the old part helps where there is more than one version.

Fuel tankFiller neck and capIn-tank pumpLevel senderFuel filterWater separatorLines and connectorsHigh-pressure pumpPressure regulatorFuel railRail pressure sensorInjectors and seals
Fuel delivery — schematic, to show where the part sits. Arrangement is right; it is a diagram and not a fitment reference.

Rest of the delivery

All fuel system parts
Get in touch

Fuel water separator (diesel) for your Mercedes-Benz?

Send the chassis number and a photograph of the old part. We come back with genuine, OEM and aftermarket options priced side by side, with lead times.

Mon–Sat, 8:00 AM – 6:00 PM · +971 54 303 3119 (Operations Director) · +971 54 241 0599 (Managing Director)