I know a pump that will work. Actually I am using it for my water spray on my WRX intercooler(waitting for the right nozzel for water injection) The pump is a shurflow diagram agriculture model, capable even pumping motor oil at 50 PSI! It cost me $60 (on sale) and weights 4lbs. With two mist nozzels, the pumb is only clicking every 5 seconds to supply the pressure.
