For Mercedes Benz Clk 350 owners looking to undertake routine maintenance, understanding the location and replacement process for the fuel filter is essential. Unlike some earlier models, the CLK 350, equipped with the M272 engine, features an internal fuel filter located inside the fuel tank. This is a change from external filters found in older Mercedes models, placing it conveniently within the fuel tank assembly.
While replacing an internal fuel filter might sound more complex, it’s a manageable DIY task for those with some mechanical experience. The process involves accessing the fuel pump assembly, which is typically located under the rear seat of the CLK 350. You will need to remove the rear seat bottom and access panels to reach the fuel pump and sender units.
Once you have access, the next step involves detaching the retainer rings that secure the pump and sender units. It’s important to note that there are variations depending on whether your Mercedes Benz CLK 350 is a California Emissions model or not. Non-California emission vehicles typically use a screw-on retainer ring, which, although designed for a special tool, can often be managed with pliers if you’re careful.
For Mercedes Benz CLK 350 models with California Emissions, a different system is used. Instead of a ring, you will encounter a large “hose clamp” style retainer. This type of clamp requires a small right-angle tool, like a SkewDriver or similar right-angle screwdriver, to loosen the screw and release the clamp.
Safety is paramount when working with any part of the fuel system. Gasoline and its fumes are highly flammable. Always ensure you are working in a well-ventilated area, preferably outdoors, and keep away from any sources of ignition, sparks, or open flames. Critically, disconnect the vehicle’s battery before starting any work on the fuel system to prevent accidental electrical sparks.
Working with gasoline requires caution, but the liquid fuel itself is relatively stable. The real danger lies in the fumes, which are explosive when ignited. Even after emptying the fuel tank, residual fumes will still be present, so maintain utmost care throughout the process. Replacing the internal fuel filter in your Mercedes Benz CLK 350, while requiring careful steps, is a task that can be confidently undertaken with the right preparation and safety measures.
