There are two approaches that work. First is Airflow setup from Van's or Airflow. This pump system utilizes a high pressure pump with a external regulator and bypass checkvalve. Lowest new cost, most parts/stuff.
Second approach is to use an aircraft boost pump with built in bypass. Dukes and Weldon are widely used in certified ships (Arrows, Mooneys, most low wing ships with injected engines). They are available with the 25psi pressure needed by the Bendix/Airflow and Silverhawk injections systems. The Weldon is available from Aircraft Spruce.
As mentioned earlier, the Dukes/Weldon offer a cleaner installation...just plumb inline after the filter/valve. Cost is somewhat higher.
I went with the Airflow system since I had a big balance due from returned parts.
Deene Ogden
RV8, 390, BA, Clark FB, Grove airfoil gear
EAA Tech Counselor/Flight Advisor