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Put all your questions in numbers, easy to answer

Most of my answers are generalized & not specific to P220.

Hope you're aware of the basics of FI & Carbs; so Fi does the same stuff as carbs just that the control is not mechanical like carb & controlled by a computer program through various inputs & feedbacks.

So a Fi has a ECM, that reads inputs from exhaust (for closed loop) & intake manifold & the amount of fuel inflow & determines the right AF mixture to be fed through the injectors to the cylinder.

While if you compare this with a regular carb, it works completely mechanical to send the AF mixture from the float to cylinder via jets. It has 2 jets, main & pilot & 3 type of position for handling idle, idle-mid & wide open.