Next to the fuel filter there is another connection related to the fuel system. Is this line a return line? If so, will there be any fuel pressure on it when the pump is running? I'm basically looking to pressurise my fuel rails after installing my new injectors to see if any o-rings pinched and will leak, but I'm not sure what I have to do with this connection (ie. do I have to cap it, or can I just leave it, or do I have to connect it to the rail too).
Here is.......>> A quick flow chart of how the fuel system in the engine bay works.Fuel flows from the fuel filter - to the fuel damper and into the fuel rail. It then flows along the rail past all the injectors to the other end of the fuel rail where it finds the pressure regulator. Once it leaves the regulator it flows through the return line back to the tank.
So.... I could connect the fuel filter to the rails, and block off the return line, and I would be OK (also blocking off the other fuel exit from the rails, of course).
No there would be no way to regulate pressure. In the system you describe the fuel pump would have to be used to regulate pressure, as is the fuel pressure regulator sets pressure by deciding how much is allowed back through the return line.Ben
All I'm talking about is turning the ignition to on to get the system prepressurised...... surely it wouldn't matter in that case as that pressure would not be regulated given that the pump only runs for a second or so to get some pressure into the system.
