Gas Odor After K&N Filter

[Wolfton]

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........