FAW J6P Fuel Supply System: Deconstructing 50 Critical Parts for Precision Injection

Welcome to this expert deconstruction of the FAW J6P Fuel Supply System (Chapter 23). This is the complete “High-Pressure Common Rail” (HPCR) assembly for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck.

This is not a simple fuel line; it is a complex “Logic Assembly” of 50 component types, engineered for one purpose: to create and control immense pressure.

The “logic” of this FAW J6P Fuel Supply System is to draw fuel, filter it, pressurize it to over 25,000 PSI, and inject it as a microscopic, atomized mist directly into the cylinders at the precise microsecond it is needed.

The “Common Rail Logic” is what defines this FAW J6P Fuel Supply System. Unlike old systems, the ‘Fuel injection pump’ (Comp 1) does not *time* the injection; it only “generates pressure.” This immense pressure is stored in the “common rail” (the high-pressure pipes, Comp 35-42). This “logic” allows the ‘Injectors’ (Comp 18) to be electronically controlled, independent of the pump. This “Multi-Shot Injection Logic” (firing multiple, tiny injections per power stroke) is what gives the engine its quiet operation, its low-end torque, its fuel efficiency, and its low emissions.

This expert guide is an essential resource for engine technicians, fuel system specialists, and parts managers. We will deconstruct the entire 50-component group into its four primary “logic” systems: the “Low-Pressure & Filtration Logic” (the priming pump and filter), the “High-Pressure Generation Logic” (the main injection pump), the “High-Pressure Distribution Logic” (the common rail pipes), and the critical “Injection & Return Logic” (the injectors and return lines). This is the complete guide to the FAW J6P Fuel Supply System.

Core 1: The “Low-Pressure & Filtration” Logic (Comp 28, 49)

This group’s “logic” is to pull fuel from the tank, “prime” the system, and provide “Absolute Filtration” before the fuel ever reaches the expensive high-pressure pump.

1. Component: ‘Rotary-style hand-priming pump assy’ (1117010-29D)
This (Comp 49) is the “Serviceability Logic.” The FAW J6P Fuel Supply System is “self-bleeding” during normal operation, but after a filter change, the lines are full of air. This “hand-priming” pump’s “logic” is to allow a technician to manually *pull* fuel from the tank, *push* it through the ‘Fuel filter’ (Comp 28), and *bleed* all the air out of the system. Starting the engine with air in the lines can damage the high-pressure pump.

2. Component: ‘Fuel filter assy’ (1012010-36D)
This (Comp 28) is the “System Protection Logic.” This is the “gatekeeper” for the entire FAW J6P Fuel Supply System. High-Pressure Common Rail (HPCR) components have tolerances measured in *microns*. A single grain of sand or a drop of water will *instantly* destroy the ‘Fuel injection pump’ (Comp 1) or the ‘Injectors’ (Comp 18). This “Absolute Filtration Logic” means this filter must remove 99.9% of all water (via an integrated separator) and all particulate matter down to 2-5 microns. A cheap, low-quality filter is the number one cause of FAW J6P Fuel Supply System failure.

Core 2: The “High-Pressure Generation” Logic (The HPCR Pump)

This group represents the “muscle” of the FAW J6P Fuel Supply System. Its sole function is to generate over 25,000 PSI of fuel pressure.

1. Component: ‘Fuel injection pump assy’ (1111010C31E)
This (Comp 1) is the “Pressure Logic.” This is a high-precision, “positive displacement” pump (likely a 3-piston radial pump). It takes the “low-pressure” (60-90 PSI) fuel from the filter (Comp 28) and compresses it to an immense 25,000+ PSI. Its “self-lubrication” logic is that it uses the diesel fuel itself as its *only* lubricant. This is another reason why the ‘Fuel filter’ (Comp 28) is so critical.

2. Component: ‘Fuel injector drive gear’ (1111216-59D)
This (Comp 7) is the “Drive Logic.” This high-pressure pump is not electric. It is “gear-driven” directly from the engine’s internal “Timing Gear Train.” This “Gear-Drive Logic” is a “life-of-the-engine” solution, as it is 100% reliable and perfectly timed with the engine’s rotation.

3. Components: ‘Support-fuel injection pump’ (1111101-31E) & ‘Bracket’ (1111102-29D)
These brackets (Comp 31 & 34) are the “Alignment Logic.” The ‘Drive gear’ (Comp 7) must mesh *perfectly* with the engine’s timing gear. These heavy-duty, cast brackets bolt to the engine block and provide a rigid, precision-machined mounting flange that guarantees this perfect alignment.

4. Components: ‘Lube oil pipe assy’ (1104060-29D) & ‘Hollow bolt’ (1104066-367)
This (Comp 10 & 11) is the “Pump Lubrication Logic.” While the *pumping* side of the HPCR pump is fuel-lubricated, its “drive” side (with its own bearings and camshaft) is lubricated by *engine oil*. This pipe’s “logic” is to “tap” clean oil from the engine block and feed it directly to the pump’s bearings, ensuring its long-term durability. This is a critical link for the FAW J6P Fuel Supply System.

Core 3: The “High-Pressure Distribution” Logic (The Common Rail)

This group forms the “Common Rail” itself. Its “logic” is to act as a “pressure reservoir” or “accumulator,” storing the 25,000+ PSI from the pump and distributing it to all six injectors.

1. Components: ‘High-pressure fuel pipe assy’ (Cyl 1-6) (1129010… to …1129060-31E)
These (Comp 35-40) are the six individual “injector lines.” These are the most critical pipes in the FAW J6P Fuel Supply System. Their “logic” is “Identical Length.” They are *all* precisely bent to be the exact same length. This is crucial. If one pipe were shorter, the “pressure waves” from the injector firing would be different, causing Cyl 1 to get a different pressure “pulse” than Cyl 6. By making them identical, the “pressure-wave logic” is balanced, ensuring every cylinder gets the *exact* same fuel, for a smooth, balanced engine.

2. Components: ‘High-pressure fuel pipe clip/base/gasket’ (1129100-29D, etc.)
This group (Comp 41-48) is the “NVH & Safety Logic.” The six high-pressure pipes (Comp 35-40) “throb” violently with every injection event. If allowed to touch each other or the engine, they would “chafe,” vibrate, and develop a “fatigue crack.” A high-pressure fuel leak at 25,000 PSI is not a “drip”—it is an *atomized*, highly-flammable mist that will instantly cause a massive engine fire. The “logic” of these clips and brackets is to hold every pipe perfectly rigid and isolated, preventing this critical failure in the FAW J6P Fuel Supply System.

Core 4: The “Injection & Return” Logic (The Injector)

This final group’s “logic” is to perform the “final event”: injecting the high-pressure fuel into the cylinder.

1. Component: ‘Injector’ (1112010-31E)
This (Comp 18) is the “Atomization Logic.” It is a high-speed, electronically-controlled (solenoid or piezo) needle valve. When the ECU commands, it opens for a few *microseconds*. The 25,000+ PSI pressure forces the fuel through microscopic holes in its nozzle, “atomizing” it into a vapor-like mist that ignites instantly for maximum power.

2. The “Sealing” Logic: ‘Injector gasket’ (1112306-29D) & ‘O-ring’ (1112014-29D)
The injector (Comp 18) must be sealed from two things. The ‘Gasket’ (Comp 17) is a copper “crush washer” at the bottom. Its “logic” is to seal the 2000+ PSI of *combustion pressure* out. The ‘O-ring’ (Comp 19) is a rubber seal at the top. Its “logic” is to seal the low-pressure “fuel return” *in*, preventing fuel from leaking onto the hot engine.

3. The “Clamping” Logic: ‘Injector presser plate’ (1112013-29D) & ‘Bolt’ (1112011-29D)
This “Clamping Logic” is what holds the injector in its bore. The ‘Bolt’ (Comp 21) pulls up on the ‘Presser plate’ (Comp 20), which pivots and creates a high “downward” force on the injector. This force is what “crushes” the ‘Gasket’ (Comp 17) to create the combustion-proof seal.

4. The “Return” Logic: ‘Fuel injector return pipe assy’ (1104050-29D)
This (Comp 13) is the “Bypass Cooling Logic.” The HPCR pump and injectors “bypass” a large amount of fuel to cool and lubricate their own moving parts. This ‘Return pipe’ “logic” is to collect all this “used” fuel from the injectors and the pump and route it safely back to the fuel tank. This is a vital part of the FAW J6P Fuel Supply System‘s thermal management.

FAW J6P Fuel Supply System Parts List & Specifications

The following table provides the complete, detailed breakdown of all 50 component types in the FAW J6P Fuel Supply System for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck.

Core Specifications

The specifications for the FAW J6P Fuel Supply System are defined by its function as a high-pressure common rail (HPCR) injection system.