When I fill up my car with gas there is a strong gas odor around the left back seat on the interior and around the left rear wheel on the outside. After further investigation I found gas leaking around the left sending unit / pump. This is a serious design flaw as the sending unit / pump is made of plastic and servers a structural member to suspend the unit in place. The presence of gas fumes in…
2007 Mercedes-Benz CLS-Class fuel system problems
moderate 8 complaints filed with NHTSA · avg repair $1,200 · see fuel system across all vehicles →
Failure mileage
Complaints
8
Recalls
0
Avg fix
$1,200
When does it fail?
Of the 8 fuel system complaints filed for the 2007 Mercedes-Benz CLS-Class, here's the actual mileage breakdown — failures cluster heaviest at 50,000-75,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Fuel system accounts for 20% of all owner complaints filed against this vehicle, across 4 categories tracked.
No new NHTSA fuel system complaint has been filed on this vehicle in over 12 years — the issue may be aging out of the active population.
What owners are reporting 4 most recent
I had filled my car up with gas the night before I noticed the incident. The next day when I went inside of my vehicle it had spelled horribly of gas, so bad I was getting light headed from the fumes and had to keep the window's open to air out. But the smell has remained for a week now.. I located the source of the smell coming from the rear seat on the drivers side, I removed the rear seat…
I filled my car up sunday and parked it in the garage, the following morning there was a strong fuel smell that permeated the garage and all around the car. I looked for leaks found none. The smell was coming from under the seat on the drivers side rear. I reviewed some online forums and noticed this seems to be a common occurence with these vehicles. This is very dangerous and a saftey hazard.…
Check engine light came on. Reads p0456 EVAP small leak detected. After filling gas tank full or anything over 3/4 full. Strong gas fumes smell inside and outside of car. Checked top of fuel pump under rear driver's seat. Fuel was puddled on top of this unit. (I have pictures if needed) replaced fuel pump seal ring and gas cap with new parts. Problem has came back with more check engine codes and…
Had fuel system trouble with your 2007 Mercedes-Benz CLS-Class?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the fuel system problem on the 2007 Mercedes-Benz CLS-Class?
It's a documented issue but not catastrophic. 8 complaints have been filed. Repairs average $1,200 and most owners catch it before it causes a breakdown.
At what mileage does the fuel system typically fail?
Across the 8 complaints that reported odometer mileage, most fuel system failures cluster between 57,500 and 87,726 miles, with the median around 61,585. A quarter of owners report trouble before 57,500; a quarter make it past 87,726. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $1,200 for fuel system repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to fuel system?
No active recalls currently cover fuel system issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2007/Mercedes-Benz/CLS-Class.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.