Hi, fellow rotary enthusiasts.  I'm directing this question primarily to Rusty, as he has a similar Dave Atkins fuel system such as I have, but I certaintly welcome comments from any and all.

      My TWM throttle body I purchased from Dave Atkins has two injectors already installed on the throttle body. It also has the fuel rail, and I have still in the box, the fuel pressure requlator. I assume that my fuel flow will go from the tank, through the fuel tank selector valve to the fuel pump, then through the pressure regulator, to the injectors.  My question is.....do I need to allow a return to the fuel tank for unused or excess fuel?  If so, do I take it from the fuel rail opposite the pressure requlator? I am, unfortunately, a complete layman when it comes to fuel injection, so please be gentle on me.  I noted that on the injectors that came with my engine, that the injectors have a small tube protuding 90 degrees from the injector, which I assume was for the purpose of returning fuel to the tank?  Thanks in advance for everyone who takes the time to educate/enlighten me regarding the fuel injection system. I sincerely appreciate the help.  Paul Conner, 13B powered SQ2000 canard under constructrion.

Paul;

The pressure regulator goes downstream from the fuel rail.  It controls the pressure by by-passing fuel back to the tank; so, yes; you will need a return fuel line.  The TWM press regulator threads right into the downstream end of their fuel rail (at least mine does).  Make sure the o-ring is in place.

Al Gietzen  Velocity 20B