PLEASE check the fuel pump relay! That bad boy will cause your 190 to stop in the middle of nowhere for no reason. You can jump the pins to see if it will start (forgot which ones - a little help from a senior member please). Mine had a cold solder joint. I didn't even have to replace it. I just resoldered the bad joint. If you buy a new relay, it'll run about $150. When the fuel pump on mine went, it hummed and sang for a month. In fact, it never "went out" completely, I just got sick of the noise and the gas smell.
85 190E War Pony - 156K