Attention: TDR Forum Junkies 
I did a search today on fuel delivery/lift pump stuff and was reading some posts from the months back. I came across a rather long post which left me with a question. I work as a firefighter and deal with pumps day in and day out. In my work, we use a pump to provide enough water to the nozzle. In between that we have pressure loss from the hose the water is flowing through. So if I know the volume of water nessesary at the nozzle, and the pressure nessesary to provide that volume minus the friction loss of the water flowing through the hose, I can figure out what pressure to set the pump at. So now I am thinking of our trucks as a fire engine.
Our goal is to provide the VP44 with enough fuel to feed the injectors, which can be measured in GPH. So now all we need to do is have the fuel delivery system deliver that number to the pump. Seems simple enough, use a pump that can provide the required GPH at the end of our fuel line that would go to the VP44. So now the question is, what pressure is needed to provide the nessesary flow? So if we figured out this pressure, wouldn't that answer all our questions? If we know exactly what pressure is required to provide the nessesary GPH to the VP44, then as long as our pressure readings never drop below that mark, we are set.
So if we can figure this number out, than all we would have to do is calculate the friction loss in pressure of our fuel deliver system between the pump and the VP44. Take this number, add it to the pressure nessesary to provide required flow, and there you have it... .
What do ya think?
Our goal is to provide the VP44 with enough fuel to feed the injectors, which can be measured in GPH. So now all we need to do is have the fuel delivery system deliver that number to the pump. Seems simple enough, use a pump that can provide the required GPH at the end of our fuel line that would go to the VP44. So now the question is, what pressure is needed to provide the nessesary flow? So if we figured out this pressure, wouldn't that answer all our questions? If we know exactly what pressure is required to provide the nessesary GPH to the VP44, then as long as our pressure readings never drop below that mark, we are set.
So if we can figure this number out, than all we would have to do is calculate the friction loss in pressure of our fuel deliver system between the pump and the VP44. Take this number, add it to the pressure nessesary to provide required flow, and there you have it... .
What do ya think?
