get an adjustable pressure regulator and run the return to the tank and then adjust the pressure to 15 psi... . Put the regulator after the stock pump, not the pusher... . you need to get rid of the small hose between the pump and the filter and plumb in the regulator between those... . you find you will have better flow so like 15 idle, 13-14 cruise, and no less than 11-12 WOT.