After a couple of months my car is back on the road. Every year I have a lot of work during christmas so it was not possible to fix issues with the fuel system.
After buying the car some months ago, I've had some problem with the fuel lines, fuel pump, and the kugelfischer. It all begun the first time I filled the fuel tank, the first fuel pump died. A new pump was installed and it was running ok, but after going to the petrol station again for a full tank it died again, then was working again with no explanation, but not running smooth, and after some kms it died definitely. So my guess was that the fuel tank was dirty, very dirty indeed.
Last december I called the tow truck and went to the workshop, until today. Fuel tank was removed and cleaned, my cousin (he is a mechanic, I'm lucky) told me that there was a three inches mud inside the tank, and that it was hard to remove, he was amazed the car could be running with all that in there. Well, tank was clean, pump filter clean, fuel filter changed, now car was starting better than ever,but still failing and every time I step on the gas and released the throttle the car stopped, I was frustrated, why was this happening?, then everything was clean, pump was dead silent and filters cleaned. My worst thoughts came to my mind; the kugel was dead? luckily there is a guy not far from my uncle's workshop, who is one of the few mechanics that still know how to set up kugels. The car has been there for three days and now is running smooth as silk He told me that I've been very lucky the kugel did not died with all that dirt coming through it. There was some kind of problem with the air regulator (or something like that). He suggested to use some cleaner for the fuel system from FORTE, I bought it already.
I hope this is not going to happen again, though some other issues will appear, I know, it's a forty years old car.
Happy to have drove it again after this.
PS: sorry for my english, there must be some mistakes.