Quote:
Originally Posted by pfilean
Jay,
the "momentary" switch is only a toggle switch that is spring loaded to return to its original position when pressure is removed from the switch. As long as you hold the switch it powers one circuit and when you release it it returns to its original position to power the other circuit. Completely independent of the ignition switch.
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So your holding the switch to keep the pump on? I thought the idea was to control the switch by the throttle position.
I will add a couple corrections I found, I was off on what I though the Holley electric pump free flow is. 110 was for the 14 psi blue race pump. 97 gph is for the red street pump, max pressure 7 psi. I found the free flow number for the Carter electric vane pump also, it is rated a 100 gph and max pressure is 8 psi. So they are pretty much the same. The Carter is rated for 50 gph at operating pressure, so I would guess the Holley would run close to that.
The stock replacement mechanical pumps appear to run 30 gph, and 40 gph for a high performance. The free flow on the mechanical high performance pumps goes up from 40 to 120 gph, the mechanical pumps seem to respond more to free flow than the electric pumps. As long as the free flow is higher on the pump that is getting fed by the pusher pump there should be some decent gains running a pumps in series. If the free flow of the mechanical is less than the free flow of the electric I think the mechanical pump becomes a bottle neck.