Chevrolet GMC Vortec 4.3L Spider Injector Assembly 1996-2005: OEM FJ503

Restore Fuel Precision on Chevrolet & GMC Vortec 4.3L (1996–2005)

What is it?
The Chevrolet GMC Vortec 4.3L Spider Injector Assembly OEM FJ503 is a complete set of fuel injectors and delivery rails designed to feed fuel efficiently and accurately to each cylinder in the Vortec 4.3L engine. Operating under high pressure, this assembly ensures the right fuel amount is delivered at the right time, supporting smooth combustion and reliable engine performance across driving conditions.

Why choose OEM FJ503?
This spider injector assembly is built to match the original specifications for Chevrolet and GMC Vortec 4.3L engines from 1996 through 2005. As a genuine OEM-aligned part, the FJ503 assembly offers dependable compatibility with your vehicle’s fuel system, helping reduce issues such as rough idle, hesitation, hard starting, or poor throttle response that can occur with worn or mismatched injectors.

Key Benefits
✅ Designed for Chevrolet & GMC Vortec 4.3L engines (1996–2005)
✅ Helps restore precise fuel delivery to all cylinders
✅ Supports smoother idle, better throttle response, and efficiency
✅ Built to resist heat, vibration, and fuel contaminants
✅ Direct-fit assembly for easier installation

Applications
This spider injector assembly is ideal for pickup trucks, SUVs, and vans powered by Chevrolet or GMC Vortec 4.3L engines from 1996–2005. It’s commonly used in daily drivers, work vehicles, and fleet units that demand reliable fuel delivery and stable performance.

Installation Notes
Before installation, ensure the engine is cool and depressurize the fuel system. Clean the injector ports and inspect surrounding fuel lines for wear. Install the new assembly, replace any aging seals or O-rings, and torque all fittings to manufacturer specifications. After installation, cycle the key to build fuel pressure and check for leaks before full operation.

Final Thoughts
If your Chevy or GMC with a Vortec 4.3L engine starts showing signs of uneven fuel delivery, the OEM FJ503 spider injector assembly offers a reliable, factory-matched solution. With precise fuel metering and dependable performance, it helps revitalize engine responsiveness and keep your vehicle running smoothly. Tamerx has this injector assembly in stock and ready to ship.