Low Pressure Fuel System - All Others: Notes
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2018 Ford Transit-350 HD, 2018 Ford Transit-350, 2018 Ford Transit-250, 2018 Ford Transit-150, and 2018 Ford F-550 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
Fuel is drawn from the fuel tank, passed through the primary fuel filter under vacuum and then pressurized by the fuel pump assembly. Pressurized and filtered, approximately 379 kPa (55 psi) during engine idle, the fuel is pumped through the fuel supply line to the secondary fuel filter (the secondary fuel filter housing is located on the front left side of the engine). The filtered fuel leaves the secondary fuel filter and flows to the high pressure pump. Fuel bled off by the high pressure pump and fuel rail pass through the fuel cooler before returning to the fuel conditioning module. Fuel bled off by the fuel injectors is recycled to the inlet side of the secondary fuel filter.