My kid bro's 190e had a similar issue.

Would only start on 2nd try.Will start only on 1st try with help from accelerator.Warm or cold.

Also, in his case, we could smell fuel near the rear of the car all the time.

We swapped the fuel pump.Now, fuel smell is gone.Car starts fine on 1st try without accelerator when cold.

However, it still has a hot start problem.

We recently changed the fuel accumulator but that did not solve the hot start issue.

Interesting to see if anyone else has the same issues.

Azhari
Babybenz 1991 190e 1.8