Just doesn't run

Hello you
I am now in doubt if I know my fat one so well, I have driven him for a long time now and he has always brought me home. But now he just doesn't want to help me, maybe you can help me, so to my story.

At the beginning of this year I came back from vacation and my brother-in-law picked me up by car at the airport. He told me he had jumped on normal and ran until shortly before flying normally route Frankfurt-Hahn. And then suddenly no longer really gas accepted on that point he might not be fuel to the tank any more, after that he would hardly have jumped on (super gastankt) had to stare him a parmal until he came back and came just so with stood gas and without taking big gas to the airport where he went out and got him no more.
When I arrived, I got it back in idle mode after long attempts at start-up and made us in stationary gas until the next tank.
And from then on he didn't jump at all or just briefly and immediately again.
The nice Adac took my fat then huckepack and brought us home.
At home he checked fuel, he said, "Zündfunken (new spark plugs) are coming too, nothing in the fault memory, today I brought a new reverberator after some tips from you and installed it. After a few short mucking nothing compersion also checked so far Ok. Spark plugs out again are totally wet gets somehow too much of the juice, dried after another start attempt again wet.
!!! Now I'm at a loss, maybe you guys have some more tips on stock???? Maybe one of you will come from near me (Frankfurt am Main) who can help me further.

Greetings Holger