RAM 2500 Truck 4WD L6-5.9L DSL Turbo VIN 6 (1999)
Fuel Injector Spray Pattern
The fuel injectors use hole type nozzles. High-pressure flows into the side of the injector and causes the injector needle to lift and fuel to be injected. The
clearances in the nozzle bore are extremely small and any sort of dirt or contaminants will cause the injector to stick. Because of this, it is very important
to do a thorough cleaning of any lines before opening up any fuel system component. Always cover or cap any open fuel connections before a fuel
system repair is performed.
Fuel Injector Edge Filter
Each fuel injector connector tube contains an edge filter that breaks up small contaminants that enter the injector. The edge filter uses the injectors
pulsating high-pressure to break up most particles so they are small enough to pass through the injector. The edge filters are not a substitute for proper
cleaning and covering of all fuel system components during repair.
The bottom of each fuel injector is sealed to the cylinder head with a 1.5mm thick copper shim (gasket). The correct thickness shim must always be
re-installed after removing an injector.
Fuel pressure in the injector circuit decreases after injection. The injector needle valve is immediately closed by the needle valve spring and fuel flow
into the combustion chamber is stopped. Exhaust gases are prevented from entering the injector nozzle by the needle valve.
