Section 03-04D: Fuel Charging and Controls, 7.3L Diesel Engine | 1996 F-250, F-350 and F-Super Duty Workshop Manual |
Fuel pressure in the cylinder head fuel galleries is maintained at 275 kPa (40 psi) by a fuel pressure regulator. The fuel pressure regulator contains a spring-loaded spool valve which opens to allow excess fuel to exit the cylinder head fuel galleries. The fuel pressure regulator is located on the side of the fuel filter (9155).
NOTE: Only certified replacement hoses with the correct part number should be used when repairing the 7.3L turbo fuel system. Any other hoses may not provide the pressure and flexibility required for proper fuel system operation.
Excess fuel from the cylinder head fuel galleries is routed to the fuel pressure regulator through special rubber compound hoses from the front of each cylinder head (6049). The hoses absorb and smooth pressure pulses from the piston stage of the fuel pump (9350).