Fiat Punto 188 1.2l 8V BJ 2002 – engine does not start after ZKD change (no spark)

Hello together, we changed the ZKD seal of my Punto today, after repair manual. As far as everything apart without problems and get together again. Now the car can not start again ( yesterday I could still start and drive without problems!). The starter works perfectly, however, the engine does not start. We could not do much error diagnosis anymore, because it then unfortunately became dark. Only so much: the spark plug of the very right cylinder did not generate sparks (have they screwed out and held to the engine block). If you start the ignition, one hears a surren – I assume that this is the petrol pump (…or?) Where could the problem lie? I would like to continue with the error search tomorrow and would be extremely grateful for helpful comments! 😉 Thank you very much and nice evening, Tom