Hi I'm running two pumps on a two man system out my van. Problem is one pump is pumping at a very low rate and the other very fast. I've removed the small screws from just underneath the pressure switches. They are both running of the same power feed. The pump pressures are still a problem when run on there own. They are Both flojet 9 amp 5.4 litre per min max. Any body have any idea how to tern these buggers down. Please help.