The FAST LSX/LSXR/LSXRT Fuel Rails feature a larger internal diameter that dampens the pulses and provides increased fuel volume, ensuring that your injectors never run dry. In addition, they yield better fuel distribution and ultimately greater horsepower. FAST fuel rails deliver performance in addition to a show car quality appearance.
Key Features
- The FAST LSX/LSXR/LSXRT Fuel Rails feature a larger internal diameter that dampens the pulses and provides increased fuel volume, ensuring that your injectors never run dry.
- In addition, they yield better fuel distribution and ultimately greater horsepower.
- FAST fuel rails deliver performance in addition to a show car quality appearance.
Fitment
| Fitment Basis | Exact FAST manufacturer part number and component interface |
|---|---|
| Required Verification | Confirm engine family, dimensions, ports, connectors, sensors, wiring, fuel-system requirements, and mating components |
Specifications
| Brand | FAST |
|---|---|
| Manufacturer Part Number | 146021-KIT |
| Product Type | Fuel Rails |
| Fitment State | Fitment Verification Required |
| Condition | New |
| Engine or Product Family | LSXR, LS1, LS6 |
What's Included
One new FAST fuel rail identified by manufacturer part number 146021-KIT. Additional gaskets, sensors, wiring, fittings, adapters, rails, injectors, throttle bodies, and hardware are included only when expressly stated for this exact part number.
About FAST
FAST develops electronic fuel injection, intake manifolds, throttle bodies, sensors, wiring, and supporting components for performance engine combinations. Correct selection depends on the exact part number and complete system requirements.
Related FAST Products
- FAST Billet Fuel Rail Kit For LSXR
- FAST Billet Fuel Rail Kit For LSXR
- FAST Billet Fuel Rail Kit For LSXR
Browse the FAST collection for related fuel injection and induction components.
Frequently Asked Questions
How do I confirm FAST 146021-KIT is the correct fuel rail?
Match the manufacturer part number, connector or mounting interface, dimensions, engine family, control system, and every FAST application note. Do not select it by appearance alone.
Does FAST 146021-KIT include the connectors, seals, and hardware I need?
Only components expressly listed for this exact part number are included. Inspect the existing assembly and identify any separate adapters, seals, wiring, fittings, or fasteners before ordering.
Will installing FAST 146021-KIT require tuning or setup?
Requirements depend on the component and vehicle. Sensors, fuel-system parts, airflow components, and controllers may require calibration, relearn, leak checks, or professional setup.
Installation Instructions
Follow the current FAST instructions for manufacturer part number 146021-KIT and the vehicle or engine service information. Verify compatibility before disassembly, disconnect power and relieve fuel pressure when applicable, use new seals where specified, torque all fasteners correctly, check wiring and hose routing, inspect for leaks or binding, and complete any required calibration or relearn. Professional installation is recommended.
Engine
Shop automotive engine parts, cooling-system components, oil-system upgrades, ignition parts, pulleys, sensors, gaskets, fuel components, and engine-bay accessories at Black Ops Auto Works. This collection covers vehicle-specific replacement parts, performance upgrades, supporting hardware, and universal components for street cars, trucks, SUVs, Jeeps, diesel vehicles, off-road builds, and motorsport applications. Engine Parts and Performance Components The Engine collection brings together components used throughout the engine, lubrication system, cooling system, ignition system, fuel system, crankcase ventilation, accessory drive, and engine compartment. Available products range from replacement sensors and gaskets to rotating-assembly parts, performance cooling systems, supercharger pulleys, catch cans, cylinder heads, camshafts, intake manifolds, and engine-bay dress-up components. Engine compatibility cannot be determined from vehicle model alone. Confirm the exact year, make, ...
View Engine Products
FAST
Shop FAST intake manifolds, throttle bodies, EFI retrofit components, fuel rails, sensors, and wiring at Black Ops Auto Works. Explore Fuel Air Spark Technology products for compatible LS, Gen III HEMI, and custom engine configurations. From updating an intake assembly to planning a multiport EFI installation, choose components that match the cylinder heads, throttle controls, fuel system, and engine-management requirements. FAST LSX, LSXR, LSXRT, and LSXHR Intake Manifolds This collection includes multiple FAST manifold families for supported LS applications, with cathedral-port, rectangular-port, and LS7-specific configurations represented. These manifolds differ in port geometry, packaging, and intended engine combination. An LS designation alone does not establish compatibility. Identify the cylinder heads actually installed on the engine, especially on swapped or modified vehicles. Confirm the manifold’s port configuration, inlet size, overall height, fuel-rail requirements, an...
View FAST Products
Fuel Delivery
Shop performance fuel delivery parts for gasoline, diesel, EFI, carbureted, boosted, and flex-fuel builds at Black Ops Auto Works. This collection brings together fuel pumps, pump modules, rails, pressure regulators, filters, tanks, surge tanks, carburetors, flex-fuel kits, sensors, injection-pump components, and installation hardware for street, towing, off-road, and motorsport applications. Choose vehicle-specific and universal components from trusted manufacturers including Aeromotive, DeatschWerks, Radium Engineering, Walbro, Fleece Performance, Fuelab, Injector Dynamics, COBB, Turbosmart, AEM, Titan Fuel Tanks, Edelbrock, and more. Always verify the exact year, make, model, engine, fuel type, pressure requirements, and connection sizes before ordering. Fuel Pumps and Pump Modules Replace a weak factory pump or build a higher-capacity fuel system with in-tank pumps, external pumps, brushless pumps, complete modules, hangers, controllers, and fitment kits. Pump selection should...
View Fuel Delivery Products
Fuel Rails
Fuel Rails parts and accessories for LS, Hemi, Coyote, K-series, 2JZ, RB26, EJ, BMW S58, Mazda rotary, Miata, Ford modular, and other EFI engine swaps are stocked at Black Ops Auto Works. Shop billet fuel rails, dual-feed rails, return-style rail kits, top-feed conversions, crossover lines, fuel rail plumbing, injector hardware, and high-flow EFI components for street cars, track cars, trucks, and focused performance builds. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 197 Fuel Rails SKUs across fitment-specific product lines. What This Fuel Rails Collection Covers Fuel rails distribute pressurized fuel to the injectors. This collection includes billet rail assemblies, dual-feed and return-style kits, crossover parts, top-feed conversions, rail plumbing, brackets, and engine-specific EFI hardware. Fitment Comes First Confirm engine family, intake manifold, injector style and ...
View Fuel Rails Products


