JBphxior Fuel Injectors FJ504 for 1996–2002 Chevy GMC 5.7L V8 — Direct Replacement, Includes Mounting Bracket

JBphxior Spider Injectors FJ504 are direct-replacement fuel injectors designed to restore proper fuel delivery for 1996–2002 GM 5.0L and 5.7L V8 engines.

If your older Chevy, GMC, Cadillac or Isuzu V8 is showing rough idle, reduced throttle response, or poor fuel economy, worn or failing injectors are a common cause. These JBphxior FJ504 injectors match original service fitment for a long list of 1996–2002 models — including C/K trucks, Suburban, Tahoe, Express/Savana vans, Yukon, Escalade and more — and come with a mounting bracket and one-year replacement support to help simplify installation and reduce downtime.

Which vehicles will these injectors fit?

These injectors are engineered to fit many GM and related platforms from the late 1990s to early 2000s. Always verify the OEM part numbers and engine displacement before ordering.

• Covers 1996–2002 Chevrolet and GMC models with 5.0L or 5.7L V8 engines, including C1500, C2500, C3500, K-series, Tahoe, Yukon, Suburban, Express vans and Savana.
• Also fits 1999–2000 Cadillac Escalade Base 5.7L and some Isuzu NPR models using the 5.7L V8.
• Cross-references common OEM numbers such as FJ504 and multiple manufacturer part codes listed in the product features.

How do these injectors affect drivability and fuel use?

Properly operating injectors supply the right amount of fuel for combustion, which helps reduce misfires and hesitation while improving throttle response. Replacing worn injectors can also help bring fuel consumption closer to expected levels for the vehicle’s condition.

• Delivers consistent spray patterns to improve atomization and combustion efficiency.
• Helps reduce fuel pooling and injector sticking that cause rough idle or stalling.
• Maintains fuel economy by restoring correct injector flow rates.

What should I know about installation and included parts?

JBphxior supplies each injector with a bracket for secure mounting; installers should attach the bracket before finalizing installation to prevent leaks or misalignment. Basic mechanical skill and common tools are sufficient, but consult a service manual for torque specs and safety procedures.

• Includes mounting bracket — secure it to the injector before installation.
• OEM-style electrical connectors and O-ring seals required; inspect and replace seals if cracked.
• Recommend fuel system cleaning and inspection of rails and pressure regulator while replacing injectors.

What warranty and post-sale support is available?

JBphxior offers a one-year replacement window for quality issues that arise after purchase. Keep your proof of purchase and photos of the defective unit to expedite support.

• One-year replacement for manufacturing defects.
• Customer service can advise on fitment questions when provided vehicle year, model and engine size.
• Follow safe handling instructions and proper disposal for old injectors.

Who is this for: These JBphxior FJ504 injectors are intended for DIY mechanics, independent repair shops and fleet owners who maintain late-1990s to early-2000s GM and GM-derived V8 vehicles. If you own a Chevy, GMC, Cadillac or Isuzu truck or van with a 5.0L or 5.7L V8 and you want a cost-effective, OEM-type replacement to restore reliable fuel delivery, these injectors are built to meet that need while offering simple installation and a one-year replacement safeguard.