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Fuel systemPart report

2008 Mercedes-Benz CLS550 Fuel system Problems

Complaints
5about this part
Share
29%of 17 total for the year
Median mileage
42,500miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 5 complaints about the fuel system of the 2008 Mercedes-Benz CLS550, 29% of the 17 complaints for this model year. Where a mileage was given, the median is 42,500 miles.

Fewer than 15 complaints name this part, so treat the figures as a rough indication only.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“I pulled into a service station to fill my tank. After adding fuel to capacity I began to smell fuel in the passenger compartment. I attributed the smell to possibly spilling fuel on myself. I drove the vehicle to work and then home. The next morning I continued to smell fuel in the passenger compartment. I took the vehicle to the dealer for diagnosis and was told that there was a leak in the tank that was splashing / venting into the passenger compartment. The service technician shared that this was a common problem with the cls.”

NHTSA complaint #10604989, filed 2014-06, 16,000 miles

“On march 10, 2012 my wife started the aforementioned vehicle and immediately began to smell gasoline fumes in the passenger compartment. As she exited the parking garage, the toxic fuel smell became unbearable and she immediately turned- around, re-entered the garage, quickly shut off the car and exited the vehicle for fear of fainting and / or an explosion. …”

NHTSA complaint #10503839, filed 2013-03, 55,000 miles

“Leaking fuel around the fuel sending unit under rear seat behind driver, filling the passenger compartment with gasoline fumes, after filling the car up with gasoline.”

NHTSA complaint #10926259, filed 2016-11, 112,000 miles

“The failed component of the car was the drivers side fuel transfer pump. After noticing the faint smell of gas in my car i checked under the rear driver side passenger seat. I was shocked to find more than 16 fluid ounces of gas floating freely around the well of the gas pump.the insulation under the rear passenger seat is soaked in gas. I can only imagine what could’ve happened if there was an accident or if someone even sparked a cigarette in my car. Not only is this extremely dangerous, there are negative consequences that result from inhaling gas constantly while driving. …”

NHTSA complaint #11638320, filed 2025-01

Related service bulletins

Fuel system: other model years

YearComplaintsShare of year
2014110%
2012835%
2008529%
20072469%
2006343%

Other parts of the 2008 Mercedes-Benz CLS550

Air bags
3 complaints
Electrical system
3 complaints
Engine
2 complaints
Suspension
2 complaints
Brakes
1 complaints
Electronic stability control
1 complaints
Exterior lighting
1 complaints
Other or unknown
1 complaints
Steering
1 complaints
Tires
1 complaints
Transmission and drivetrain
1 complaints

← All problems reported for the 2008 Mercedes-Benz CLS550

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Nov 1, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology