The fuel supply manifold assembly is the component that delivers high pressure fuel from the vehicle's fuel supply line to the fuel injectors. The assembly consists of a single preformed tube or stamping with four (or eight) injector connectors, a mounting flange for the fuel pressure regulator, a pressure relief valve for diagnostic testing or field service fuel system pressure bleed down and mounting attachments which locate the fuel manifold assembly and provide fuel injector retention. On 1987-88 4-140 engines, the fuel supply manifold assembly is also equipped with a fuel pressure pulse damper, at the fuel supply fitting. This damper is designed to reduce pressure pulsation in the fuel lines, which may cause a ticking or hydraulic hammering noise.
REMOVAL & INSTALLATION
See Figure 1
- Remove the fuel tank cap. Release the pressure from the fuel system.
- Disconnect the fuel supply and return lines.
- Disconnect the wiring harness from the injectors.
- Disconnect the vacuum line from the fuel pressure regulator valve.
- Remove the two fuel injector manifold retaining bolts.
- Carefully disengage the manifold from the fuel injectors. Remove the manifold.
- Installation is the reverse of removal. Torque the fuel manifold bolts 15-22 ft. lbs.