the same time high pressure is being built up on the discharge side of the
(7) After the centrifugal pump (6) is primed and rotated by the engine,
pump. The vacuum gage (17) and the pressure gage (18) indicate the low
the impeller on the inside of the pump spins causing a low pressure vacuum in
pressure and high pressure.
the suction line. This vacuum draws source water through the suction line. At