2014 Mercedes-Benz GLK350 Fuel system Problems

The contact owns a 2014 Mercedes-Benz GLK350. The contact stated that there was an abnormal fuel odor inside and outside vehicle. The check engine, TPMS, and several other unknown warning lights were illuminated. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 100,000.

NHTSA ID

11750586

Incident

Jul 11, 2026

Mileage

100,000 mi

See attached document for complaint.

NHTSA ID

11693897

Incident

Sep 4, 2025

The contact owns a 2014 Mercedes-Benz GLK350. The contact stated while starting the vehicle after refueling, there was an abnormal gasoline odor inside the vehicle. The vehicle was taken to the dealer and the contact was informed that the fuel pump was leaking onto the rear seats. The contact was informed that the fuel pump needed to be replaced. The vehicle was not repaired. The manufacturer was contacted, and a case was filed. The failure mileage was 64,000.

NHTSA ID

11526545

Incident

Jun 5, 2023

Mileage

64,000 mi

My vehicle started smelling like gas. Took it in for inspection. Mechanic found a leak in the fuel assembly, resulting in gasoline pooling inside the vehicle under the back seat and leaking out through the bottom of the vehicle. I went online and noticed a recall was issued for 2011 and 2012 models. Ongoing issues with fuel modules leaking although no visible cracks were present. I contacted Mercedes to have them review if this would be covered under their recall and they declined saying they did not want to cover this under their recall. Mercedes made me take the vehicle in to their dealership in Kahului Maui to verify the issue which I did. They sent me a quote for the repair with no specific parts listed, just fuel module in the amount of $1884.71. Comments: "left fuel pump/filter assembly leaking" No warning lamps or check engine lights came on which is disturbing since exposed gasoline could lead to ignition with a small spark. With further investigation online I found that I am not the only GLK350 2014 owner that is having issues with fuel module leaking. Mercedes inspection form available here: https://app.mykaarma.com/service-cart/mpi/t8xQy8Ac2bYidaNLm0xxzW7MeeqxfPne_HG5wpWCmhQ/detail

NHTSA ID

11511839

Incident

Feb 14, 2023

The contact owns a 2014 Mercedes-Benz GLK350. The contact stated that while driving he noticed a fuel odor throughout the vehicle. The contact referenced NHTSA Campaign Number: 12V557000 (Fuel System, Gasoline). Additionally, the contact stated that when he attempted to refuel the vehicle from a half tank, gasoline started spilling from the filler neck unto the exhaust pipes. The dealer was notified of the failure and an appointment was scheduled. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure and the contact stated that he was redirected to the manufacturer’s website. The failure mileage was approximately 90,000.

NHTSA ID

11483630

Incident

Aug 9, 2022

Mileage

90,000 mi

The Fuel pump tank closing cover (P/N 204-470-04-38) cracked and caused fuel to pool on it. This happens when the tank is above 3/4 full resulting in strong fuel fumes when the car is parked inside. It is likely when parked in a garage to be an explosion hazard due to the fumes. Looking on the user forums and internet this is not an uncommon issue and should be addressed as this design is used on most Mercedes fuel tanks in the 2000's.

NHTSA ID

11439542

Incident

Oct 28, 2021

WE STARTED TO DEVELOP A STRONG SMELL OF GAS INSIDE THE VEHICLE. I STARTED TO RESEARCH ONLINE TO FIND THAT MANY MERCEDES MODELS HAVE THE SAME PROBLEM, A CRACK DEVELOPS ON A CAP THAT HOUSES THE FUEL PUMP UNDER THE BACK SEAT INSIDE THE VEHICLE. THIS PERMITS GAS FUMES TO ENTER THE VEHICLE, LET ALONE ACTUAL GASOLINE TO COLLECT ABOVE THE CAP AND LEAKING UNDER THE SEAT INSIDE THE VEHICLE. SOME PEOPLE TRY TO JUST PATCH IT WITH EPOXY AND ATTEMPT TO REPLACE PARTS. BUT THIS PROBLEM SEEMS TO BE ONGOING FOR YEARS ON VARIOUS MODELS AND OBVIOUSLY IS A DESIGN FLAW THAT NEEDS IMMEDIATE ATTENTION BY THE MANUFACTURER. YOU NEED TO DRIVE WITH THE WINDOWS OPEN AND IF THE VEHICLE IS PARKED OVERNIGHT, YOU CANNOT ENTER THE VEHICLE FOR A LONG TIME IN THE MORNING, UNTIL IT AERATES.

NHTSA ID

11394886

Incident

Jan 25, 2021

Mileage

70,000 mi

TL* THE CONTACT OWNS A 2014 MERCEDES-BENZ GLK350. WHILE THE CONTACT'S SPOUSE WAS DRIVING THE VEHICLE, THERE WAS AN ABNORMAL FUEL ODOR. THE VEHICLE WAS TAKEN TO MERCEDES-BENZ OF SCOTTSDALE (4725 N SCOTTSDALE RD, SCOTTSDALE, AZ 85251, (480) 409-0409) TO BE DIAGNOSED. THE CONTACT WAS INFORMED THAT A PLASTIC TUBING LEADING TO THE FUEL INJECTOR FRACTURED AND NEEDED TO BE REPLACED. THE VEHICLE WAS REPAIRED. THE MANUFACTURER WAS NOT INFORMED OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 72,000. VEHICLE WAS TAKEN TO MERCEDES BENZ OF CHANDLER (CHANDLER, AZ) FOR REPAIRS. CONSUMER WAS ALSO INFORMED THAT THE PLASTIC RESERVOIR WAS CRACKED. *DL

NHTSA ID

11278227

Incident

Sep 19, 2019

Mileage

72,000 mi