Ok, BlazerLT. Everything understood.
Alone that the pieces are quite expensive in my country; for example, the CPI (spider) it is difficult to get and it costs between 450 and 650 dollars, and the hoses (white as those of your car) are not gotten.
On purpose, the mechanic carried out the verification indicated in your link with the old kit that is still installed, opening the switch and indeed there is leak of fuel. The exact place of the leak was difficult to observe with the installed kit, seemingly it is between the regulator and the body of the spider or possibly for some of the hoses of the injectors, in the place where they emerge of the body of the spider, but there is not leak properly for the hole of the end of the regulator.
I am in the process of getting the pieces for the repair. I will change the oil, the oil filter and the upper plenum gasket (żIs the upper plenum the same dynamic chamber?).
Thank you.