
Caution
Cleanliness cannot be overemphasized when handling or replacing diesel fuel system components. This especially includes the fuel injectors, high-pressure fuel lines and fuel injection pump. Very tight tolerances are used with these parts. Dirt contamination could cause rapid part wear and possible plugging of the fuel injector nozzle tip holes. This in turn could lead to possible engine misfire. Always wash/clean any fuel system component thoroughly before disassembly and the air dry. Cap or cover any open part after disassembly. before assembly, examine each part for dirt, grease or other contaminants and clean if necessary. hen installing new parts, lubricate them with clean engine or clean diesel fuel only.
There are two ways to access the limiting valve. You can either remove the fuel rail by removing the injector lines, supply line and return line and completely removing the rail. This installation method can be difficult as accessing the fittings on #5 and #6 can be difficult. The other option is to disconnect the EGR
and remove the intake manifold. We suggest these instructions as they reduce the chance of damaging fuel system components and take less time.