At this point also in centrifugal due to high rpm as it is directly coupled to engine the pump creates partial vacuum which means the liquid will certainly flow through vacuum hence the liquid will end up being recieved at the centrifugal pumps suction and since the impeller rotates the liquid will be displaced aside forward with a particular energy.

A vacuum pump gets the inlet hooked up to 1 or both valve covers, sometimes the Centrifugal Vacuum Pump valley pan. It SUCKS the air flow from the engine, therefore reducing the surroundings pressure build-up created by blow because of combustion gases going past the piston rings into the pan.