6.6 Gal in L or C,and each eng pump is moving 37 Gal/min?so all the fluid circulates almost 6 times per minute,every 10 seconds?
The eng pumps will move 37gall/min at full flow. But these punps (and the elec pumps) are constant pressure, variable flow pumps. Inside the pump is a swashplate that varies the stroke of the pistons, controlled by system pressure. So when the sys pressure is 3000, the pump produces very little flow. This is the state of the pump most of the time.