2012 Mercedes-Benz ML350 fuel system problems

Filed Apr 14, 2026 · Fuel system · NM

Engine stalled driving on interstate highway at 70mph. Mechanic diagnostic indicated to be faulty fuel pump and/or fuel pump control unit. This issue has been recognized by mercedes benz as a faulty issue and subject to recall. Upon calling mercedes benz dealer was told there was no recall on this matter for my vehicle contradicting this issue previously recognized by mercedes benz.

Filed Jan 6, 2025 · Fuel system · SC

Vehicle stalled without warning, and I was advised by a mechanic that the fuel pump control unit was reporting a fault through the onboard diagnostics port and the check engine light on the dashboard. It was necessary to replace the fuel pump control unit as the defect was intermittent and subject to occur at any time the vehicle was being driven. There is no available solution save the replacement. I had the fuel pump control unit replaced at my cost and after replacing it found information concerning the federal safety agency recall campaign online. The defective fuel pump control unit was discarded upon replacement and is not available for inspection. I believe the failure of this fuel pump control unit is a direct result of the recall not being complied with. I believe the manufacturer; Mercedes Benz USA is responsible for my costs expended in repairing this defect under the recall campaign because they did not notify me of the recall. I purchased this vehicle from an authorized Mercedes Benz USA dealer, my personal contact information is a matter of record of the sale, and I believe Mercedes Benz USA had a duty to contact me concerning the federal safety agency recall campaign #2023010002 concerning this vehicle.

Filed Apr 30, 2024 · Fuel system · 79,372 miles · VA

The contact owns a 2012 Mercedes-Benz ML350. The contact stated that while her husband was driving at an undisclosed speed, the vehicle made an abnormally loud sound and then stalled. Additionally, the vehicle failed to accelerate properly while driving. The contact's husband coasted the vehicle to the side of the road. The vehicle was restarted and driven to the residence. The vehicle was taken to an independent mechanic, who diagnosed that the fuel pump needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 79,372.

Filed Nov 17, 2023 · Fuel system · WA

While driving, vehicle stalled. Mechanic found water in spare wheel Well. And fuel module and fuel pump shorted out. Had vehicle repaired; 07/22. The vehicle stalled again in 12/22. Mechanic found water in spare wheel well. Had to replace fuel pump. In February,2023, Mercedes Benz notified me of a recall, the federal safety agency Recall I D: 22V955 ; water intrusion in the spare wheel well. And, stated their local dealer would repair vehicle or reimburse me for the cost of repair, if I had the repair done already. I submitted receipts and documents pertaining to the repair. The Mercedes Benz Dealership refused to acknowledge the causal relationship between the repairs and the recall issue. And, refused me reimbursement.

Filed May 25, 2023 · Fuel system · FL

The contact’s husband owns a 2012 Mercedes-Benz ML350. The contact received notification of the federal safety agency Campaign Number: 22V955000 (Fuel System, Diesel, Fuel System, Gasoline) however, the part to do the recall repair was not yet available. The dealer was contacted, and the vehicle was taken to the dealer where the vehicle remained. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not made aware of the issue. The contact had not experienced a failure. Parts distribution disconnect.

Filed May 11, 2023 · Fuel system, Lights · WA

Due to water in the spare wheel well, (Recall ID:22V955) our fuel module and fuel pump went out. While driving in traffic on I-5 our car stalled then stopped which put us at risk of a crash.The first time (July 2022) It was repaired by Cooper's Auto Repair), After the 2nd time it failed again in Aug 2022, once again as we were driving, our mechanic at (Boyle's Foreign Car Repair) Aug 2022 & Dec 2022 (replace) decided to do an inspection of the whole car to see why this was happening, upon inspection he found water in the spare wheel well, He pulled out the plug to stop accumulation. 2 months later (Feb 2023 )we received the recall letter. In the letter it states that MBUSA would reimburse repairs performed prior to the recall. MBUSA is now refusing to reimburse for replacement but also refusing to find and fix where the water in entering. We reside in a very wet part of the country and see this as a continuing issue. There also is condensation in the back tail lights, which was not there until this issue started occurring. The car was previously in S Cal so there was no issue with water accumulation until it was moved to the rainy Pacific NW. We are fearful of using this car during very wet times as we do not know if this (failure of pump/module) will occur as well as condensation and water being in the back tail lights possibly resulting in the car stopping during it being driven. Therefore putting our lives in potential danger of an accident.

Filed Mar 1, 2022 · Engine, Fuel system · 110,000 miles · PA

The contact owns a 2012 Mercedes-Benz ML350. The contact stated while the vehicle was being inspected, the independent mechanic informed him of a diesel and oil leak. The contact stated no warning light was illuminated. The contact towed the vehicle to the local dealer. The vehicle was not diagnosed or repaired. The manufacturer had been informed of the failure. The failure mileage was approximately 110,000.

Filed Mar 8, 2019 · Fuel system · 103,000 miles · FL · 2 injuries

Took our 2012 mercedes-benz ml350 bluetec to the dealership numerous times due to an overpowering fuel smell and burned plastic in the cabin of the vehicle. We had to stop several times because we felt sick as if we were going to pass out and/or throw up. But, then it started to affect our children and we demanded that the dealership find the root cause. They finally determined that it was a fuel leak around the fuel injectors that completely charred components in the fuel injection cavity. It could have created a fire or loss of control of the vehicle. I noticed that this has been reported to the federal safety agency which is why I am also reporting this now also. My vehicle is only serviced by the mercedes-benz dealership. The dealership is charging me $1900 for the repair of the charred components. The federal safety agency id number: 11090864 reported exactly the same issue. I thought I was going crazy until they found the root cause of the smell. Now that there are at two reported cases of this both in 2012 mercedes-benz ml350 vehicles it should be investigated.

Filed Apr 29, 2018 · Engine, Fuel system · 49,000 miles · PA

After being into authorized mercedes benz dealership only for an strong diesel fuel smell and oil leak 3 times in less than 4 months on our ml350 bluetec engine fuel smell is strong enough that we have a sever headache ,nauseous feeling and have to stop the car and get out for fresh air, opening windows only gets more of the smell in of fuel and burning plastic. This happens while vehicle is in motion ,both on city streets and on highways, more pronounced when driving.

Filed Dec 6, 2017 · Engine, Fuel system · 48,000 miles · FL

Tl* the contact owns a 2012 mercedes-benz ml350. While at a stop light, the vehicle stalled without warning. In addition, the radio and air conditioner failed to function. The failure recurred numerous times. The vehicle was taken to mercedes-benz of coconut creek (4250 sr 7, coconut creek, fl 33073, phone: (954) 406-1167) where it was diagnosed that the fuel pump failed, there was a leak in the air conditioning system, and the radiator failed and needed to be replaced. The vehicle was not repaired. The manufacturer was not contacted. The approximate failure mileage was 48,000.