there is no way those pumps flow 4 gpm. i used lots of those stupid little pumps up in alaska, and they didnt move near that much water/fluid. but it would probably work just fine for a2w IC coolant pump, just not my preference.
A pump won't create pressure unless theres a restriction. I would just wonder how much volume the ps pump would move. A prob i see with using power steering fluid much like atf is if you had a leak your engine could ingest that and run off on you. The tractor pullers use a water soluable oil for their water injection systems. They use a high pressure high volume pump similar to a ps pump. If i didn't hate the ps brkts and belt setup i'd be up for doing it.
if it was me I would try something like this..
newbielink:http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=9576 [nonactive]
I got a few of those (and the 260 model) recently, and although they'll work, they aren't ideal unless you can get them really really cheaply. They pull a lot of current (240 uses 4A with no load) and are fairly noisy. Also, they are rated for intermittent use only. So you will need to have it under some form of PWM or similar control.
Another electric pump to throw in the mix is the aux coolant pump on the MB's. Pulls 1A and moves around 3-4gpm.
