Gas Odor After K&N Filter
 

I Have a 1991 420 SEL with 188,888 miles(Just this Morning). I just replaced the Filter housing with a 560 SEL housing and changed the filter to a K&N filter. Right after doing this I have noticed a gas odor coming in through the vents occasionally. Usually it is stronger after running it hard, or making sharp turns. I am thinking possible EHA? Or is the Mixture too Rich and needs to be adjusted. I cannot see any weeping of fuel or smell it under the hood?

Thanks for the Help........

Do the 560 and the 420 engines have the same size air sensor? If the 560's is larger, there'd be a gap between the 420 air sensor and 560 air cleaner . . . .

I did not pay attention to the size of the sensor. I had been told that the air pans were identical except for the fact that the 560 has another opening on the drivers side for fresh air.

There may be exceptions, but all the sedans I've seen (of that era) had snorkels on both sides of the air cleaner; SL's only have one on the driver's side.

My question, though, was about the hole in the bottom of the air cleaner - I thought that would be proportional to engine size, so 5.6 liter engine would require a bigger hole than a 4.2 engine would.

My question would be why you installed a K&N filters????
Their marketing campain and publicity got you.
it has been proven times after times that K&N is a waste of money in terms of benefit and a cash drain in some cases where the MAFS have been damages/ruined by their use.
JackD

The reason why I used a K&N is because of the experiences I had using them in every car that I have owned. Plus the fact that they are very cost effective when you can get them for about the same price as a paper filter (through shopping around). There is a difference using the dual snorkel with a K&N VS. The Paper filters. The difference in the improved in acceleration and milage is noticable. Many people have tried to Dyno their cars with and without a K&N and see little difference. The biggest diff I have felt is when moving I get more ram air because of the Dual Snorkels and a less restrictive air filter. I like being able to buy one filter and use it over and over. I have never had a problem with one and I dont think I have one now.

Btt....

Bored a little today, Jack? ;)

Hi Tyler, this may be obvious but.... if you have no underhood fuel leaks and your air cleaner housing is properly sealed, have you checked elsewhere for a leak, is your fuel cap tight ? Just a thought.

Well the fuel cap is tight. I noticed this weekend the smell is stronger after I have run it a little hard and then stop at a light or stop sign, then when I start to move again is when I notice the smell. It's not constant only so often.....It's really starting to get on my nerves. Thanks for the help.