FAW J6P Fuel Line Logic Assembly: Deconstructing 22 Critical Parts for a Leak-Proof Engine

Welcome to this expert analysis of the FAW J6P Fuel Line system (Chapter 32). This is the complete “fuel plumbing” network for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck. This is a “Logic Assembly” engineered to manage the “suction,” “feed,” and “return” of diesel fuel to the engine under extreme, off-road conditions.

The “Dual-Circuit Logic” is the key to this FAW J6P Fuel Line system. The “Suction/Feed Side” (Comp 17, 18) is the most critical. This is a “suction” system. Any pinhole leak from vibration or “chafing” (rubbing) will not leak *fuel out*; it will suck *air in*. Air in a High-Pressure Common Rail (HPCR) system is catastrophic. It will “cavitate” the injection pump and starve the injectors, leading to power loss, stalling, and permanent component damage. This FAW J6P Fuel Line is engineered for 100% airtight integrity.

This technical guide is an essential resource for chassis technicians, fleet maintenance managers, and parts specialists. We will deconstruct the entire 22-component group. We will analyze the “Suction & Feed Logic” (the main pipes connecting the tank to the engine), the “Return & Venting Logic” (the bypass and vapor pipes), the “Securing & Protection Logic” (the anti-chafe components), and the “Reservoir Logic” (the FAW J6P Fuel Tank that this entire FAW J6P Fuel Line system services).

Core 1: The “Suction & Feed” Logic (Components 17, 18)

This group represents the low-pressure “supply side” of the FAW J6P Fuel Line system. Its entire logic is to pull fuel from the tank and deliver it, air-free, to the engine’s filter system.

1. Component: ‘Inlet pipe assy – fuel tank to coarse filter’ (1104120-14BJ)
This (Comp 17) is the “Primary Suction Logic.” It is the “straw” that connects the ‘Fuel tank assy’ (Comp 1) to the primary “coarse filter” (or fuel/water separator).

This “logic” is the most vulnerable part of the entire system. Because it is a “suction” line, a tiny pinhole from chafing will not *leak fuel out* (as it’s not under pressure). Instead, it will *suck air in*. This “Air Ingress Logic” is a catastrophic failure.

Air in the HPCR pump (Chapter 23) will instantly cause “cavitation” (the violent implosion of air bubbles), which erodes the high-precision pump pistons and starves the injectors, leading to a “no-start” condition or severe engine damage. This is why this FAW J6P Fuel Line is an “assembly,” likely with pre-formed, rigid sections to prevent kinking or chafing.

2. Component: ‘Inlet pipe assy – coarse filter to engine inlet’ (1104130-14BJ)
This (Comp 18) is the “Clean Feed Logic.” After the fuel passes through the *first* filter (the coarse filter/water separator), this pipe’s “logic” is to transport the now “pre-cleaned” fuel *to* the engine.

It connects the primary filter to the “inlet” of the “FAW J6P Fuel Fine Filter” (Chapter 24). This line is *still* on the “suction” side of the main pump, so its airtight integrity is just as critical. A leak here will also introduce air into the high-pressure pump. This specific FAW J6P Fuel Line is the final “low-pressure” artery before the fuel enters the engine-mounted filtration and pressurization stage.

Core 2: The “Return & Venting” Logic (Components 19, 20)

This group’s “logic” is to manage the “waste” products of the FAW J6P Fuel Line system: bypassed (hot) fuel and fuel vapors.

1. Component: ‘Return pipe assy’ (1104250-14BJ)
This (Comp 19) is the “Thermal Management Logic.” High-Pressure Common Rail (HPCR) systems (see Chapter 23) use a “Bypass Logic.” They pump *far more* fuel than the engine needs. This excess fuel is used to “cool and lubricate” the high-pressure pump and the six injectors. This “bypassed” fuel is now *hot*.

This ‘Return pipe’ “logic” is to collect all this hot, low-pressure fuel from the engine’s “return manifold” and send it back to the ‘Fuel tank assy’ (Comp 1). The massive volume of the FAW J6P Fuel Tank then acts as a “heat sink,” cooling the fuel before it is “sucked” up again by the ‘Inlet pipe’ (Comp 17). A kink or blockage in this FAW J6P Fuel Line is a critical failure that will cause the HPCR pump to overheat and seize.

2. Component: ‘Intake/Exhaust pipe’ (1104301-50A)
This (Comp 20) is the “Vapor Venting Logic.” This is *not* the engine’s air intake or exhaust. This is the *fuel tank’s* “vent” pipe. Its “logic” is to connect to a port on the ‘Fuel tank assy’ (Comp 1) or ‘Fuel tank cap’ (Comp 2) and safely route any fuel vapors *away* from the hot chassis or exhaust system. This “safety logic” is designed to prevent a dangerous buildup of flammable diesel fumes and is a critical part of the FAW J6P Fuel Line‘s safety system.

Core 3: The “Securing & Protection” Logic (Components 21, 22)

This group’s “logic” is “Anti-Chafe & Anti-Vibration.” A loose FAW J6P Fuel Line in a heavy-duty dump truck will be destroyed by vibration or chafing in a matter of days.

1. Component: ‘Limit plate’ (1104266-36S)
This (Comp 21) is the “Rigid Mounting Logic.” This is a specialized “clamp” or “bracket” that is bolted to the chassis frame. The “logic” of this ‘Limit plate’ is to hold one of the rigid fuel lines (like Comp 17 or 18) in a *specific, fixed position*.

This “securing logic” is what prevents the FAW J6P Fuel Line from “whipping” or “vibrating” against the frame, which would cause a “fatigue crack” at its weakest point (usually the metal fittings).

2. Component: ‘Zip tie’ (T67417246)
The list calls for seven (7) of these (Comp 22). This is not a “cheap fix”; this is “Deliberate Engineering Logic.” The “Chafing Prevention Logic” is that these “zip ties” (or hose clamps) are used to “anchor” the FAW J6P Fuel Line (especially flexible sections) to various brackets or to *other* hoses.

Their “logic” is to prevent the #1 killer of hoses: “rubbing.” If a low-pressure FAW J6P Fuel Line is allowed to rest against a sharp-edged chassis bracket, the engine’s vibration will cause the bracket to “saw” a hole through the line. These 7 ties are strategically placed to hold all lines securely, clear of any sharp edges or hot surfaces (like the exhaust manifold), ensuring the system’s long-term, leak-proof integrity.

Core 4: The “Reservoir” Context (The FAW J6P Fuel Tank)

This final group includes all the *other* components from the Chapter 32 parts list. Their “logic” is to provide a secure, anti-vibration “cradle” for the FAW J6P Fuel Tank, which is the source and destination for the FAW J6P Fuel Line system.

1. The “Storage” Logic (Components 1, 2)
The ‘Fuel tank assy’ (Comp 1) is the main “Reservoir” with internal anti-surge baffles. The ‘Fuel tank cap assy’ (Comp 2) is the “Venting Logic,” allowing air *in* to replace fuel, but preventing vapor *out*.

2. The “Mounting” Logic (Components 4, 6)
The ‘Rear bracket assy-fuel tank’ (Comp 4) is the heavy-duty steel “shelf” that the FAW J6P Fuel Tank *sits on*. It bears the entire 350kg+ weight. The ‘Strap assy-fuel tank’ (Comp 6) is the high-tensile steel band that wraps *over* the tank, clamping it down onto the bracket.

3. The “Anti-Chafe” Logic (Components 5, 7)
This is the “Protection Logic.” The ‘Gasket-bracket’ (Comp 5) sits *between* the bracket and the tank bottom. The ‘Gasket-strap’ (Comp 7) lines the *inside* of the steel strap. This “logic” ensures “no metal-on-metal contact,” preventing vibration from “chafing” a hole in the FAW J6P Fuel Tank.

4. The “Fastener” Logic (Components 8-16)
This is the “Hardware Logic.” This group contains all the ‘Hexagon flange bolts’ (Comp 8, 9, 10, 11), ‘Hexagon nuts’ (Comp 12), and ‘Washers’ (Comp 13, 16) required to mount the bracket. The ‘Flat pin’ (Comp 14) and ‘Cotter pin’ (Comp 15) are a “Safety-Lock Logic” for the strap, preventing the main T-bolt or pin from ever vibrating loose.

FAW J6P Fuel Tank & Fuel Line Parts List

The following table provides the complete, detailed breakdown of all 22 component types in the FAW J6P Fuel Tank and FAW J6P Fuel Line assembly for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck.

Core Specifications

The specifications for the FAW J6P Fuel Line system are defined by its function as the critical plumbing between the tank and the engine’s HPCR system.