Yes I was finding opposing literature from Dr. Djet on Oldtimer to the Bosch yellow book I'm reading. But it seems obvious to me that fuel is pushed through by the pump and the regulator, which is adjustable, sends back access through the return line but what isn't said is that is sent back at the same pressure as the fuel pump sends... which is one of the reasons having the proper fuel pump pressure is important- so that it doesn't blow the return line over time I am supposing. I'm sure the lines are made to handle far more than 2.1 bar (30psi). I've never seen a fuel line that isn't about 100 to 120 or more in capability. But I haven't seen everything and who knows what Jethro down the street put on his car.So after 13 years of believing the D-Jet worked one way, as Graham and the Bosch Yellow Book (which I have) have proven,
I find out it works the opposite. The fuel pump does indeed feed the injector ring through the diaphragm then back to the tank
through the pressure regulator. The opposite of everything I had been taught. My apologies for the confusion.