Had the gas smell when I bought my 190 and replaced the little green orings on the EHA and got a new gas cap and it took care of the smell.

When you replaced the EHA did you use new orings or the old ones? If you used the old ones, get new ones.

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89 190E
2.6L
Arctic white
Grey leather
Sunroof
Pirelli P400 rubber
Smoked corners