Doing some numbers checking, the pinion wire im using to make the gears is from mcmaster carr
https://www.mcmaster.com/#standard-gears/=17s4i0k Its 24p 12t with an od of .580" which I can force into a 9/16" collet to machine. I turn down the shaft dia to .250 and then take a light skim cut over the tooth profile to ensure its concentric.
I modeled the cavity of the tooth to calculate out the flow per rpm, my guess of what tooth thickness I needed was way way off at approx 1700ml/min @ 3k rpms, thats what I get for guessing... Going to thin down the gear a bit so i get 1000ml/min.
Problem is the motor. Im thinking that a 320Kv motor will do the trick but need to figure out how much pressure it will be able to generate (more research needed) assuming the pup is 80% efficient.
