Mercedes SLK R170 Petrol Fuel Tank Level Sensor Sender Unit A1705420217

Mercedes SLK R170 Petrol Fuel Tank Level Sensor Sender Unit is an element from the Fuel pumps and level sensors group, designed for the fuel supply system of petrol engines in Mercedes vehicles. Using a complete pump module with a float allows for stable power supply to the engine unit and precise fuel level readings, which translates into predictable engine operation and driving comfort.

Specifications and technical data

• SKU: A1705420217
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1705420217
• Substitutable numbers: A1705420217, A 170 542 02 17
• Fuel type: Petrol
• Category: Fuel Pumps & Sending Units

Purpose and function in the fuel system

The presented fuel pump with a float is designed to work with M111 and M112 series petrol engines in the Mercedes SLK R170 model. It is responsible for two key tasks: pumping fuel from the tank to the fuel rail and transmitting information about the fuel level to the instrument cluster. The integrated float works with the level sensor, ensuring that the gauge on the dashboard reacts to actual changes in the amount of fuel in the tank.

The module is a low-pressure system component that must maintain adequate fuel flow for the injectors, ensuring smooth engine operation across the entire load range. A properly selected fuel pump reduces the risk of pressure drops, starting problems, and engine misfires during dynamic driving.

Benefits of using an original Mercedes module

Using an original solution from the Fuel pumps and level sensors group in a Mercedes vehicle allows you to maintain the factory operating parameters of the fuel supply system. The module's design is matched to the geometry of the fuel tank, which ensures proper fuel suction at various fill levels and while driving in corners or on hills.

The main advantages of using this type of fuel pump with a float include:

• maintaining a stable power supply for the petrol engine across the entire RPM range,
• consistency with factory control and fuel system operating characteristics,
• proper cooperation with the original fuel level gauge,
• reducing the risk of diagnostic errors associated with incorrect part selection.

A used component can be an attractive cost-effective alternative while maintaining compliance with the vehicle's factory specifications, especially for older models where maintaining efficiency at reasonable costs is a priority.

Selection by part numbers and fuel system compatibility

The selection of a fuel pump with a float for a specific Mercedes SLK R170 should be based on the OEM part number and interchangeable numbers, as well as vehicle identification data. This makes it possible to match the module to the specific petrol engine configuration and equipment version, without the risk of installation or system operation issues.

To better understand the role of this element in the entire fuel supply system, it is worth reading the material discussing the construction and operation of the fuel system, including the principles of selecting parts by OEM and VIN numbers – this is described in detail in the article Fuel system – injectors, pumps and fuel tank: maintenance and regeneration.

Practical installation and operating tips

When replacing the fuel pump module with a float in a Mercedes SLK R170, it is recommended to maintain extreme cleanliness around the fuel tank and check the condition of seals and electrical connectors. Proper seating of the module in the basket and correct connection of fuel lines and the electrical harness have a direct impact on system tightness and the accuracy of fuel level readings.

In the case of older vehicles, where the availability of new components is sometimes limited, a used pump module can be a reasonable service solution. The issue of the cost-effectiveness of using dismantled parts and their impact on the maintenance costs of older cars is discussed more broadly in the entry No parts at the dealership? How to deal with repairing older models using dismantled parts.

System expansion within the same category

If you are planning a comprehensive repair or upgrade of the fuel system area in your Mercedes and need other elements from the same group, such as additional pump modules, fuel level sensors, or components working with the float, check the available parts in the Mercedes fuel pumps and level sensors category.