Tables and Charts

Injector Application And Test Information:

(1) Return fuel systems return fuel to the fuel tank by means of a return line from the fuel rail.
(2) Mechanical returnless fuel systems do not return fuel to the fuel tank by means of a fuel return line. The pressure regulator is mounted on the Fuel Pump Module located in the fuel tank and excess fuel is returned at this point.
(3) Electronic fuel systems do not return fuel to the fuel tank by means of a fuel return line. There is no fuel pressure regulator and pressure is controlled by continuously varying the fuel pump speed through the Fuel Pump Driver Module (FPDM).