Ford 7.3L Diesel Fuel System Flow Chart - Supply, Regulator & Return Diagram

This document is a color-coded fuel system flow chart (schematic) for a diesel engine fuel supply system. It traces fuel flow beginning at the fuel tank, where it is drawn under suction (yellow) to a two-stage fuel pump depicted with a diaphragm stage and a piston stage. Low-pressure fuel (teal) passes through the fuel filter, with .035 and .020 orifices called out at the filter outlet, then through a fuel strainer to the fuel regulator (shown inside a dashed boundary). High-pressure fuel (red) is routed from the pump to the cylinder heads, labeled RB (right bank) and LB (left bank), where fuel galleries feed the injectors. Excess fuel exits via fuel return hoses and travels back to the tank on the return circuit (green). A four-row legend defines the line colors: suction, low pressure, high pressure, and return to tank. The chart lets a reader understand the complete fuel routing path, identify the sequence of filtration components (filter, strainer, orifices, regulator), distinguish supply from return plumbing, and see that both cylinder banks are fed with fuel and connected to the return system. No year, model, engine displacement, or part numbers are stated on the document itself.