Accusump Plumbing

[carbuff]

The purpose of opening the valve before starting the engine is to pre-lube everything before you spin the crank. That helps prevent metal on bearing friction and wear.

If the oil pump is creating a higher pressure than the electric pressure valve is set for, then you will be refilling the cylinder until it achieves a balance in the system.

So in my case, my idle pressure is about 38# hot. That's just over the 36# pressure valve in my system, but a little close for comfort. So I use my Holley to send +12V to the valve above 1400 rpm where I know pressure is above 40#. That guarantees the cylinder is not discharging during normal driving. As I rev the motor, and the pressure goes higher, more pressure builds up in the cylinder but is not discharged until the pressure is below 36#.

Now, in your case if you are using a manual valve, that is different I believe. You could still open the valve to prelube, but you might not want it open all the time in day to day driving. I really don't know what the best answer is in that situation...