Your 1986 MB 190E is having trouble starting after you get gas but if you pour a little gas in the carburetor and try starting 10-15 times it usually starts so whats the problem?

This is just a stab in the dark but your fuel maybe pergulating, if so there is too much heat coming from your manifold to the underside of you carburettor and it is boiling your fuel in the carburetor I you, Nibbs

First of all, a 1986 190E is not carbureted. It has a mechanical fuel injection system that is computer and vacuum controlled. Next it could be an array of things, 1. The cold start injector could be plugged or faulty. (this is a very common issue on alot of pre 1993 benz) 2. It could also be the coolant temp sensor. (if one were faulty then it would be sending an incorrect signal to the computer causing it to think the engine is warm, thus making the cold start injector inoperable. the main purpose of the injector is to give the engine fuel when its cold because as it is fuel injected it lacks a choke to aid in cold starting... hopefully this helps!! -supra_mk3tt-