Why does the fuel pressure regulator go into the fuel setup after the fuel rails rather than before? Or, why is gas suppose to flow through the regulator on its return route to the the gas tank after the fuel rails rather than before it enters the fuel rails??
Cobrastang
The restrictive action of the regulator on the rail outlet keeps the rail full of fuel.So there is always full volume available.The regulator function assures the pressure in the rail is a constant by bleeding off excess and returning it to the tank.The return line has fuel running thru it at virtually no pressure.
HUH?? I have my regulator after the fuel pump and fuel filter right now, but before the fuel rails. i was told that this was wrong and that i actually need the regulator on the return path to the tank after the fuel rails. so my system goes like this currently-
in tank pump to filter
filter to pressure regulator
pressure regulator to fuel rails
fuel rails back to tank
NOw i need to change the lines so that the gas flows through the fuel pressure regulator after it goes through the rails.
IS that not correct?
in tank pump to filter
filter to pressure regulator
pressure regulator to fuel rails
fuel rails back to tank
NOw i need to change the lines so that the gas flows through the fuel pressure regulator after it goes through the rails.
IS that not correct?
Maybe this is what's confusing you.
A carb system has its regulator between the pump and the carb because you don't want to be blowing the needle off the seat in the carb. You only want 5 or 6 pounds at the carb and you don't (usually) have a return.
Injection works the other way. You want high pressure at each injector so the fuel sprays out nice and pretty each time the injector pulses open.
d
A carb system has its regulator between the pump and the carb because you don't want to be blowing the needle off the seat in the carb. You only want 5 or 6 pounds at the carb and you don't (usually) have a return.
Injection works the other way. You want high pressure at each injector so the fuel sprays out nice and pretty each time the injector pulses open.
d
What will work is to take a return line off of the regulator and go back to the tank and keep the line running to the rails, jsut do away with the current return from the rails......
having said all of that, the right way is the way described above.
having said all of that, the right way is the way described above.
Version "A" and version "B" have three ports on the regulator and the port connected to the injectors is on the regulated side of the regulator. The blue hose would be the relief side of the regulator. Version "C" has only two ports on the regulator. If you were to move the 2-port style regulator to a spot between the pump and the injectors it would not work because the injectors would be getting the "relief" fuel which is by-passed by the regulator to maintain the set pressure value in the line between the pump and the regulator.
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I have the understanding that CorB has the two port regulator as shown in Ken's version C but he has the regulator between the fuel rails and the pump and is powering the injectors with the return line which is (virtually) unpressurized.
That won't work.
A & B above will work because the three port regulator has a pressurized port AND a return port.
btw, Chris at Quality Roadsters specifies "C" for his Mass Flo system.
d
That won't work.
A & B above will work because the three port regulator has a pressurized port AND a return port.
btw, Chris at Quality Roadsters specifies "C" for his Mass Flo system.
d
Trying to locate a problem. I have a fast EFI setup, pressure builds to the recommended 43 psi then immediately drops to 0psi. Where do I begin ????
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