Just replaced what was brocken and solved the fuel leak.
Tried to start the engine and it started at first time.
Its not working fine yet, because a lot of things are missing, but it started and worked for some seconds, before I turned if off. (no radiator, water, etc...)
It was the f#$%ing fuel pump relay!!!
Still dont know what caused it to burn/not work, because before it was working fine.
Tomorrow I will start to put the rest together, restaure what needs to be restaured and if everything is right maybe next week it will be running.
I will keep you all informed of how things going...
Thank you very much to all that tried to help.