
The fuel tank on the CLK 350 is located behind the passenger seat or underneath the car. Some sources suggest that the fuel pump and filter are located in front of the right rear wheel under the chassis, while others suggest that the fuel pump is behind the passenger seat. There have been reports of fuel leaks from the upper part of the gas tank, as well as a strong odor of gasoline after refueling.
| Characteristics | Values |
|---|---|
| Fuel tank location | Underneath the car, with two gas tanks on the left and right |
| Fuel filter location | Inside the fuel pump, behind the passenger side seat |
| Fuel tank issues | Fuel leaks, strong odor of gasoline, and fuel system tank assembly problems |
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What You'll Learn

The fuel tank is located behind the passenger seat
The fuel tank on the CLK 350 is located behind the passenger seat. This is where you will find the fuel pump, which is distinct from the fuel filter, which is inside the pump itself. The fuel pump is located either underneath the rear passenger seat or underneath the car.
The CLK 350 has two gas tanks underneath the car, on the left and right sides. The fuel pump sends fuel to the driver's side tank through the filter, and then to the engine. The fuel filter is a very fine mesh screen filter.
Some sources suggest that the fuel pump is located in front of the right rear wheel under the chassis, hidden by a plastic cover with three holes. However, this is incorrect. There is another pump-like object behind the driver's seat, but this is not the fuel pump. It is an EVE app sensor that measures the fuel level in the left-side tank.
There is another EVE app sensor on the driver's side, which also has a screen. This measures the level of fuel in the gas tank.
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There are two gas tanks underneath the car
The Mercedes-Benz CLK350 is a sleek and powerful car, and understanding its fuel system is crucial for optimal performance and safety. When it comes to fuelling this machine, there's an interesting feature that sets it apart: it has two gas tanks positioned underneath the car, one on each side. This unique design is an important aspect of the CLK350's functionality and is worth exploring in detail.
Firstly, it's important to understand the purpose of having two separate gas tanks. The CLK350's fuel system is designed with balance and efficiency in mind. By distributing the fuel across two tanks, the weight of the fuel is more evenly distributed, which can enhance the car's balance and handling. This dual-tank system also allows for more precise fuel delivery, ensuring that the engine receives a consistent and steady flow of fuel during acceleration and cruising.
The location of the gas tanks is carefully engineered. Positioning them underneath the car, towards the rear, helps to lower the centre of gravity, further improving the vehicle's stability and handling. This design choice contributes to the CLK350's renowned driving dynamics and responsive performance. Additionally, having separate tanks on each side allows for more efficient fuel management. The fuel pump plays a crucial role in this system, drawing fuel from one tank and sending it to the engine, ensuring a continuous supply of fuel during operation.
While the two-tank system offers advantages, it's important to be aware of potential issues. Some CLK350 owners have reported experiencing strong fuel odours, particularly after refuelling. These odours can be a cause for concern, as they may indicate fuel leaks from the tanks or related components. In some cases, fractures at the sealing point of the tank have been identified as the source of the leak, emphasising the need for regular inspections and maintenance to ensure the safety and integrity of the fuel system.
In conclusion, the Mercedes-Benz CLK350's unique two-tank fuel system contributes to its performance and handling dynamics. With tanks positioned underneath the car on either side, the vehicle achieves better balance and fuel efficiency. However, as with any complex system, regular maintenance and monitoring for potential issues, such as fuel leaks, are essential to ensure the safety and optimal performance of this exceptional automobile.
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Fuel filters are located in front of the right rear wheel
The fuel filter on a CLK 350 is located inside the fuel pump. It is not a traditional filter, but a screen on the other side behind the driver's seat. The fuel pump is located underneath the rear passenger seat.
Some sources suggest that the fuel filter is located under the rear passenger seat, not under the car. However, others claim that it is located in front of the right rear wheel, under the chassis, and hidden by a plastic cover with three holes.
It is important to note that the fuel filter location may depend on the CLK model and engine number. For example, CLK 350s with the M272 engine have the fuel filter integrated into the Fuel Sender on the left side of the fuel tank, accessible under the back seat.
It is always a good idea to consult a professional mechanic or a trusted source of information specific to your vehicle's make, model, and year when attempting to locate and service vehicle components.
The fuel filter is a crucial component of the fuel system, ensuring that clean fuel is delivered to the engine. Regular maintenance and inspection of the fuel filter are essential to maintain optimal vehicle performance and fuel efficiency.
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Fuel leaks have been reported by CLK350 owners
In some cases, the fuel leak may be caused by a punctured gas tank, which can be more serious and may require a complete replacement of the tank. However, it is important to first identify the source of the leak. A mechanic will inspect the ground under the gas tank to confirm if gasoline has pooled and then inspect the tank to identify the source of the leak.
In addition to fuel leaks, some CLK350 owners have also reported oil leaks. This could be due to crankcase pressure forcing oil from the seal on the evaporator. Checking for signs of crankcase pressure issues and inspecting other parts in the breather system, such as the PCV, can help identify the cause of the oil leak.
Furthermore, it is important to note that fuel leaks can be dangerous and lead to flammable vapors escaping the tank. Therefore, it is crucial to address any suspected fuel leaks promptly and consult a qualified mechanic for repairs.
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The fuel pump is failing or has failed
The fuel pump in a CLK350 supplies pressurised gasoline to each of the fuel injectors in the car's engine. It is powered by a compact electric motor and is located inside the vehicle's gas tank.
Signs of Fuel Pump Failure
There are several signs that may indicate a failing fuel pump in your CLK350. Firstly, if your car won't start or unexpectedly stalls and won't restart, it could be due to a faulty fuel pump. This can be caused by a lack of adequate pressure or a complete failure of the pump.
In some cases, a failing fuel pump may cause the check engine light to come on. This can be due to a slow degradation of fuel pressure and volume, resulting in an insufficient amount of fuel reaching the engine.
Additionally, as a fuel pump fails, you may notice a whirring or humming noise coming from the fuel tank area, usually towards the rear of the car. If you hear this noise, it is advisable to replace the fuel pump as soon as possible.
Fuel Pump Replacement
If your CLK350's fuel pump has failed or is showing signs of failure, it will need to be replaced. The replacement process involves removing the fuel pump from the tank through an access panel above the tank in the passenger compartment. If there is no access panel, the fuel must be drained, and the fuel tank lowered to access the pump.
It is recommended to keep the gas tank at least a quarter full after installing a new fuel pump to maximise its lifespan. Additionally, whenever the fuel pump is replaced, it is advisable to also install a new fuel filter.
Fuel Pump Location
The fuel pump in the CLK350 is located inside the fuel tank, which is positioned under the rear passenger seat. This design was introduced in 2005 models, with earlier versions having the fuel pump located under the car, ahead of the left rear wheel.
Fuel Filter Location
The fuel filter in the CLK350 is located inside the fuel sending unit, which is also inside the fuel tank. The sending unit is on the left side of the tank, while the fuel pump is on the right side.
Fuel Pump Reliability
Internal fuel pumps, such as those found in the CLK350, are generally considered very reliable and not expected to fail. However, it is important to note that fuel pumps, like any electro-mechanical component, will eventually degrade and fail over time.
To summarise, if your CLK350 is exhibiting signs of fuel pump failure, it is important to address the issue promptly. Fuel pump replacement can be a complex task, and it is always recommended to consult a qualified mechanic or refer to a trusted repair guide for specific instructions regarding your vehicle.
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