Originally Posted by DuckStu
The regulator is what regulates fuel pressure. It acts as a restriction,... and restriction to flow is what causes pressure.
If it were before the injectors,..there wouldn't be much of any pressure AT the injectors. So the fuel goes from the pump to the rails, past the injectors..then to a variable restriction (regulator). And the leftover goes back to the tank.
You arent understanding me. (i build motors) He shows the flow opposite of what it really is in the diagram. He shows the fuel flow going outbound to the tank from the fpr. The fpr is the component that gets the fuel 1st, not last. It regulates the fuel coming in so when it exits the regulator is has X amount of pressure, then to the rails and so on... Did he do that by accident? I hope the setup he put on the car didnt follow that flow chart. I just noticed that by accident.