Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2007 Mercedes-Benz CLS550 owners, lightly cleaned up (personal details are redacted by NHTSA).
The fuel tank has a leak from a defect in the plastic, and my local Mercedes dealership is unwilling to honor the Warranty Coverage Extension that covered fuel tank components to replace the fuel tank.
Note that the vehicle on has 43,733 miles - cabin interior strong live fuel fumes - constant gas fumes on the inside of the car cabin. Note that the car was stationary at my residence parking. I did not know where were the fumes coming from at the time. Got a headache just for the moment I was trying to determined where were the fumes coming from. This is currently for all drivers and owners a very hazardous dangerous condition to all extremes, very high risk from ignition from static or electrical, due to wire hardness in the area. Vehicle was towed and took it to Mercedes Benz dealer and found the following: leakage in fuel system. Replaced fuel tank fuel tank drain/fill observed accident prevention regulation "12 wl08" fuel tank and fuel for storagebring observe accident prevention regulation "12 wl08" performed by Mercedes-Benz of new orleans. …
My husband and I purchased the 2007 CLS550 about September 2015. We noticed when filling the vehicle with gas, we would have gas fumes in the vehicle specifically on the passenger side rear inside and outside. The fumes were light and would dissipate once the vehicle was driven to reduce the amount of gas in the tank to about three-quarters tank. Last week we filled the tank and the small is now stronger and has yet to dissipate although we have a quarter tank of gas remaining. I checked for any recalls on this since we have no knowledge of the vehicle having been in any accidents, but find we do not. This online search did not reveal any recalls for the gas fumes, but I noted there are multiple complaints about the same problem for this year, make and model of vehicle. Have any people died from this, any fires, accidents as a result? …
There is a fuel leaking into the backseat of my 2007 Mercedes Benz cls 550 I began noticing the smell in my car a few months ago and I finally decided to remove the back seat, under the back seat lies the fuel tank and a fuel filter module which is leaking and creating a small pool of fuel and a fuel scent in my car. Incidentally Mercedes had a recall on the Mercedes Benz 2006 cls (voluntary emissions recall campaign #2008-020001) my car is a Mercedes Benz 2007 cls with the exact same problem. I would like to file this complaint and ask that you help me in getting Mercedes Benz to take responsibility for this faulty fuel filter module and initiate a recall to repair this problem. This problem has been documented extensively on many Mercedes Benz forums http://www.mbca.org/forum/gas-leak-sending-unit this issue creates an immediate hazard to me, my family and other drivers. …
Hi I have 2007 Mercedes CLS550 79000 miles.I had the car for past 2 years are week ago after refiling the gas tank are strong gas smell appear inside the car and out side also.I was worry for my safety and I start reading about the same problems and current campaign and recall for Mercedes e class w211 2003 to 2009 so I remove my rear passenger seat to locate the pump and the sending unit there was big puddle of raw gasoline inside the cabin around 200-300ml there was so much there the wires for the pump and sensors was under the fuel. I called the dealer they refuse to do recall for my car my car use the same gas tank and same pump and sending unit like e class from 2003 to 2008.. So if one part is defective(the gas tank) will be still defective if Mercedes put in different model car.my car is not safe any more im scary to drive it any more .
Tl* the contact owns a 2007 Mercedes-Benz CLS550. When the contact entered the vehicle, a fuel odor was noticed without warning. The failure recurred. The vehicle was taken to an independent mechanic who diagnosed that the fuel tank was cracked and leaked fuel. The manufacturer was made aware of the failure and stated that there was no recall. The manufacturer stated that the vehicle would be repaired for free if the contact took the vehicle to a Mercedes dealer. The vehicle was not repaired. The failure mileage was approximately 200,000. The VIN was not provided.
I am referencing action # pe12001. After each of my last two fuel filllings, the car is emitting a very strong smell of gasoline from the back seat & trunk compartment. I park my car in my garage and the smell is strong enough that I can smell it in my home. I am extremely fearful that there will be a fire. I do not desire to park my car outside, but I believe the car is unsafe to keep in garage. I have lost confidence in my car fearing that even driving it around town could pose a danger to me and my passengers.
Tl* the contact owns a 2007 Mercedes Benz CLS550. The contact stated that strong fuel fumes were present inside the vehicle. The vehicle was taken to an independent mechanic, but a leak could not be detected. The vehicle was not repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 51,000.
I owned 2007 mercede CLS550. I notes a strong gas smell inside and out side the car after I fill it up. I replaced the fuel cap but no help. Fumes fill up my car and my garage every time I fill up now.
I started to notice a strong smell of gasoline inside and around my car. This occurred soon after filling up my gas tank. I looked around my car to see if I could detect any leaking, or puddling underneath my car but didn't notice many drips. The strength of the smell decreased as I drove and as the gas tank level decreased. The next time I filled up my gas tank the smell came back and was very strong. Anyone who rode in the car with me including my wife and our son, would comment on the smell. After doing some research I realized that many others have had this problem, and that there is even a class action suit open for this same type of defect in another year and model Mercedes. I called to file a claim with Mercedes USA, and they said that this is not something that they would cover the repairs on. …
Fuel System complaints in other CLS550 years
Frequently asked questions
How common are fuel system problems on the 2007 Mercedes-Benz CLS550?
NHTSA has 24 complaints about the fuel & propulsion system of the 2007 Mercedes-Benz CLS550, 69% of the model year's 35 complaints.
Is there a recall for 2007 Mercedes-Benz CLS550 fuel system problems?
No. NHTSA lists no fuel & propulsion system recall for the 2007 Mercedes-Benz CLS550, though it has 4 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2007 Mercedes-Benz CLS550 fuel system problems start?
Half of the complaints with a recorded mileage happened before about 62,000 miles, and 10% before 25,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.