[Richard L]

As long as you don't go more than 12", air will not affect the priming (4mm ID hose). It all depends on how much vacuum the pump can generate (dry condition) to lift a given mass of water up a given height. As you know, the pump is designed to pump water and not air.

I don't think you have anything to worry about on your install setup.

As far as your concern regarding spray water/meth at the MAP/IAT sensor, I suggest you ignore them and put your nozzle as far away from the throttle as possible, preferably at the exit of the IC. This will give you best charge air cooling and even cylinder distribution.

The MAP/IAT sensor is going to going be smothered the moment you snap the throttle shut. When the fast moving air hit the throttle plate, it is not going to stop but bounce around. The inlet pipe will experience a mini gale storm 10 within.