So every year since I bought my CLA (2014) when it gets cold and i turn the heat on the cabin gets a gas smell that does not go away. I have told my local dealership and others this happens & they don't ever seem to think it is an issue. Mind you I have had tons of engine issues, been in the shop many times, once for almost 2 months while they replaced cracked heads and gaskets etc. and yet the dealership still thinks my car is perfectly fine. I always feel undervalued since I have the entry level Mercedes and they don't pay much attention to my issue. Any thoughts and or suggestions on how to handle this? Its winter so my car is going to smell like gas for a couple of months & I don't think it is right!!
Gas smell in the cabin of my CLA
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thank you for this, I will say the gas smell is more apparent when the heat is blowing down on my feet
I am going to bring it in for the 543 time and ask them to check
Low pressure fuel line going into the high pressure fuel pump. I've seen these on many c117 and this is usually the repair solution. Very common on m274 engines in the 205 and 213 chassis as well. Very simple repair, just take the engine cover off, remove the foam for the high pressure pump, remove the low fuel pressure quiclamps and replace the hose.
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Happened to my 2014 CLA 45AMG. They lifted the car looking for a plastic bag trapped and blocking. Nothing. The dealership drive the car and told me everything is fine... Ended up being a cracked manifold. $5K repair cost covered by warranty. Took me forever to convince them I’m not crazy with smell hallucinations...
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Wait ... what were all those earlier repairs for?
I thought it was the gas smell but they never did anything then the engine light came on and i took it in. they never really told me what was wrong but i have the 3 pages of part list that they repaired. I couldn't believe it! They didnt give me much detail, I always think they treat me differently since I have the base model Mercedes
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Thats quite the repair job back then ... post it if you can and we can take a look
With the engine idling and hood up with engine cover off, can you pick up any gas smells in the engine bay? Especially (a) near the front where the exhaust line is and (b) top of the engine to the right of the oil cap where the fuel lines are
With the engine idling and hood up with engine cover off, can you pick up any gas smells in the engine bay? Especially (a) near the front where the exhaust line is and (b) top of the engine to the right of the oil cap where the fuel lines are
JMC sorry to bug you but have you had a chance to look at the repair sheets i sent? I have to schedule my B service with them & I really want to have them fix this! 6 years of me smelling gas in the winter has got to stop.
thank you for your time
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I fixed it.
What was the outcome of that visit?
Are you still smelling gas now, (in the winter)?
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There are probably many reasons for the gas smell in your cabin. First off, if a car is running optimally, there should be minimal or insignificant ingress of gasoline smell into the cabin. sometimes , a car may for the initial secs of starting the car, you can smell some gasoline out the exhaust, unburned gasoline due to the car engine being cold.
Last year, I had changed my spark plugs for the 5 year tune up service, but I used an incorrect set of plugs, and apparently it matters that the OE mercedes plug be used, and not ones you buy from NGK that "fits" the car. After using not the mercedes OE part, gasoline smell could be detected clearly after starting the engine, and would last for a while even after driving for a while.
After swapping back to new mercedes OE plugs, the gasoline ingress smell went away.
The other things that can cause unburned gasoline , is the condition of the combustion chamber, carbon deposits on oxygen sensors, intake valves, injectors and piston head. these GDI engines are built with such tight tolerances, that slight deviations, leads to inefficient fuel combustion. I typically put in two consecutive bottles of a good fuel system cleaner every 3 months (e.g. Redline SI-1) and I can testify that it really helps. Even with the top-tier gasolines, inevitably carbon deposits will build up (albeit slower with top-tier gas), hence a thorough cleaning with high performance cleaners like Redline, goes a long way, especially if you plan to own the car and keep it for years.
Last year, I had changed my spark plugs for the 5 year tune up service, but I used an incorrect set of plugs, and apparently it matters that the OE mercedes plug be used, and not ones you buy from NGK that "fits" the car. After using not the mercedes OE part, gasoline smell could be detected clearly after starting the engine, and would last for a while even after driving for a while.
After swapping back to new mercedes OE plugs, the gasoline ingress smell went away.
The other things that can cause unburned gasoline , is the condition of the combustion chamber, carbon deposits on oxygen sensors, intake valves, injectors and piston head. these GDI engines are built with such tight tolerances, that slight deviations, leads to inefficient fuel combustion. I typically put in two consecutive bottles of a good fuel system cleaner every 3 months (e.g. Redline SI-1) and I can testify that it really helps. Even with the top-tier gasolines, inevitably carbon deposits will build up (albeit slower with top-tier gas), hence a thorough cleaning with high performance cleaners like Redline, goes a long way, especially if you plan to own the car and keep it for years.
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