2011 Mercedes-Benz C300: fuel pump failure

Filed Sep 7, 2023 · Fuel system · CA

On 8/3/2023 we could smell a strong gasoline smell inside and outside our 2011 Mercedes C300. We towed the car to a Mercedes specialty repair shop for inspection. The found that the passenger side fuel pump cover (which is a large cylinder assembly actually) was leaking due to cracked plastic. Gas vapors could be detected outside the car, in the trunk, and in the car as the gas tank is right under the back seat. Our mechanic said he had just fixed another Mercedes with the exact same problem. Apparently this is a well known defect and I understand that Mercedes has an extended warranty for later models. We believe the extended warranty should be extended to our 2011 C300 which has only 55,000 miles.

Filed Oct 5, 2022 · Fuel system · PA

When fuel tank is greater than approximately 3/4 full there is a strong fuel odor that seems to emanate from the rear passenger side of the vehicle; at lesser fuel quantities the odor is not noticeable. On one occasion I detected what appeared to be fuel dripping from underneath the vehicle. Took vehicle to dealership for troubleshooting and was informed "fuel leaks at the fuel pump" and it was recommended that the fuel pump and fuel sender be replaced. Additionally, the leak apparently damaged the electrical wiring harness to the fuel pump and that also needs to be repaired. There were no warning lamps or messages displayed that alerted me to this problem. Obviously, this is a hazard to safety.

Filed Aug 25, 2022 · Fuel system · 142,000 miles · OK

The contact's client owns a 2011 Mercedes-Benz C300. The contact stated that the vehicle's owner had complained of an abnormal fuel odor coming from the vehicle. There was no warning light illuminated. Upon inspecting the vehicle, the contact discovered that fuel was spraying out of the fuel pump onto the exhaust. The contact was able to replace the fuel pump and correct the failure. Upon investigation, the contact discovered the federal safety agency Campaign Number: 12V557000 (Fuel System, Gasoline) which he linked to the failure. The dealer nor the manufacturer had yet to be notified of the failure. The vehicle had been repaired. The failure mileage was approximately 142,000.

Filed Oct 14, 2020 · Fuel system · 32,600 miles · SC

Plastic top of fuel pump located under back seat cracks and fuel vapors enter the car. Believe the part is defected to crack for no reason or under stress.

Filed Jan 27, 2020 · Fuel system · 93,800 miles · NM

I began smelling gas in the cab of the vehicle. After refueling, the vehicle was leaking gas from the right side in the driveway of my residence and the odor of gas in the cab began to increase. Merecedes personnel refused to acknowledge other issues and wanted to begin at their starting points regarding repairs. When this recall was addressed, I was informed it did not apply to my vehicle. After a lengthy elimination process, we learned the fuel pump flange had failed in this model as it has in other similar models. Merecedes at this point refused to extend a warranty consideration so I sought out an independent mechanic to repair it. Now mercedes is refusing to reimburse the cost of the repairs.