Originally Posted by
Madsceintist
the pump(which has a check valve to hold a minimal pressure), then to have a fully adjustable regulator on demand. Your not limiting the supply of fuel by reducing the pressure, just reducing the pressure, however you do limit the supply if there is no fuel!
This is NOT correct. A check valve can hold a minimal internal pump pressure, but that has nothing to do with output pressure (system pressure). The pump does not, and cannot hold a minimum output pressure,no pump can . System pressure is always dependent upon resistant/restriction. In this case it's the injectors and regulator/relief valve.
Originally Posted by
Madsceintist
High pressure or low doesn't mean high volume or low!
Yes and no, as far as the fuel system goes, yes this is true. But as far as the fuel pump goes, there is a direct relationship with pump speed,pressure, & volume.
As for the fuel system it depends on how you lower the pressure. And the entire system configuration & demand requirements...
Lowering the voltage to a pump, WILL lower it's volume capacity but maybe not below the systems requirements.
If your pump, @14 volts is rated at 60 PSI and 0.5 GPM then that is the max it can put out. But if your regulator is adjusted to 40 psi. The injector's see 40 psi and can draw 0.5 GPM.
Lowering the voltage (slowing the pump) with voltage control, to say 35 PSI, will make the max GPM go down also, for the sake of this conversation lets just say to 0.35GPM.
If WOT require 4.5GPM to meet demand then your system will fall short and you will notice the lack of fuel volume.
But If WOT require only 3.5GPM to meet demand then your system run fine, and you could say that lowering the pressure did not lower (needed) volume.
When you're one step ahead of the crowd you're a genius.
When you're two steps ahead, you're a crackpot."