I put gas in car and it started s smoking and cut off it will not start

Gas engine 190e Benz 1993, I put gas in the car it started rough and two days later it started smoking and cut off and will not start again. Another machanic told me it was running rich, he asked me if I put gas in the car I told him yes, I haven't heard from him since

Oh, a mechanic has the car, best wait and see what he finds out since hands-on testing can be done!