So I am new to this but I just purchased a 2016 MB C300 and I just started after sitting for about 24 hours and it smells like gas inside really bad...when the heat kicked on it was worse...anybody have the same issue and any resolutions?? Thanks!

 

This is a fairly common issue reported by W205 owners in the M-B forums over the last three or so years. Some have noted that dealers also told them it is common to see owners bring their cars in for this issue as well.

There is a short rubber fuel line/hose in the engine compartment that is attached with compression clamps; the hose connects the fuel line from the gas tank to the high pressure fuel pump. When it gets cold outside (below ~40 degrees Fahrenheit) the clamps loosen a bit and the hose will leak gas. This is what you will smell in the cabin. Once it gets warmer outside or the engine bay warms up, the smell will tend to go away.

No clue how they've gone all this time without a safety recall, but I did make a report to the NTSB last month when it started happening to me.

The fix is to have the rubber line w/clamps replaced. If you still have warranty the dealer can take care of it. Otherwise if you have an M-B independent mechanic in your area I would go that route.

 

Thanks so much for the info...I will talk to my mechanic...

 

Found this thread with photos of the area where the hose is located:

https://mbworld.org/forums/c-class-w205/765134-fuel-system-diagram-other-help.html

 

I have the same issue...I’ll have to check that hose.

 

Same issue here when its cold, I'll try to tighten or replace the clamp.

 

i believe the factory clamps cannot be tightened further (based on the remarks from the workshop). best to replace them with worm clamps.

 

Location of my leak.

https://mbworld.org/forums/c-class-w...ml#post7697978

 

I had this issue repaired last month on my 2016. On mine they found leakage from the seal on the high pressure pump and at the connection of the rubber hose. The fix was to replace the high presure fuel pump and rubber fuel hose and clamps. All done under warranty.

 

It is almost certainly the fuel hose. I took my 2016 C300 home last week and smelled gas the next morning. I took it to the dealer and they replaced it under warranty.

 

Yeah mate

I had the same issue in the winter months or when the car has just driven a few km and is still not at optimum temperature.
I changed my rubber line and clamped it down pretty good.

Now, no matter what temperature outside or in the engine bay, no smell comes through in the cabin

 

Just noticed this problem, like everyone else lol. Could you list the part numbers and clamps you used? Would also appreciate any tips or instructions on the process. I'm assuming it's as simple as removing the current clamps and hose and installing the new ones. Thanks!

 

Same happened to me, 2015 C400 but it happened at higher mileage, they replaced the hose, clamp and pump, worked fine after this....

 

Same issue and I'm definitely high mileage/out of warranty. Any ballpark on the costs to replace the hose, clamps, and pump?

 

What’s your mileage? They extended the warranty for this issue on many models. I’ve had to get mine replaced twice and it was covered at 100k+ miles. I have a 2016 C300

 

ohh that’s good to know. I’m a 2015 but well under 100k. I’ll ask them. Anything I can cite to re extending the warranty for this issue?

 

Yeah you’re good then. You just need to make sure your model qualifies. It’s extended to 15 year/150,000 miles. Here’s what I got in the mail.

 

THANK YOU!!

 

thanks again for posting this! this is exactly what was wrong and it was covered by the extended warranty!

 

Could you care to explain how to do it and what will I need in terms of tools and parts.