Part #: FJ304

Standard Ignition FJ304 Fuel Injector

8 vehicles fit this part
Select your vehicle to confirm fitment
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OE Direct Replacement — Bolt-on fit, no modifications needed
Fitment: Ford, Mazda, and Mercury, Explorer, Ranger, B4000, and Mountaineer
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Overview of Standard Ignition Fuel Injector FJ304

The Standard Ignition FJ304 fuel injector is designed for reliable fuel delivery in select Ford, Mazda, and Mercury vehicles. This new MFI injector features a top feed system and includes an o-ring for a secure fit, making it a practical replacement part for models like the Ford Explorer and Mazda B4000.

  • New MFI fuel injector with top feed design
  • Compatible with gas fuel systems
  • Includes o-ring for proper sealing
  • White color for easy identification
  • Male blade terminals with two connections

Detailed Product Description

The Standard Ignition FJ304 fuel injector is engineered to meet the specifications required for fuel injection systems in Ford, Mazda, and Mercury vehicles, including the Ford Ranger and Mercury Mountaineer. This injector is a new part, not remanufactured, ensuring consistent performance and durability. It features a top feed system type, which is common in multi-port fuel injection (MFI) setups, and is designed specifically for gasoline engines. The injector terminals are male blade type with two terminals, facilitating straightforward electrical connections. The included o-ring helps maintain a tight seal to prevent fuel leaks and maintain system integrity.

Applications and Common Issues Addressed

  • Replacement for faulty or leaking fuel injectors in Ford Explorer and Mazda B4000
  • Resolves rough idling and engine misfires caused by injector failure
  • Improves fuel delivery consistency in Mercury Mountaineer fuel systems
  • Addresses poor fuel economy related to injector wear
  • Eliminates hesitation or stalling during acceleration in Ford Ranger models

Installation Notes and Tips

  • Ensure the engine is cool before beginning installation
  • Use the included o-ring to prevent fuel leaks and ensure proper sealing
  • Verify electrical connections match the male blade terminal configuration
  • Inspect fuel rail and injector ports for debris before installation
  • Follow vehicle-specific service manual instructions for injector replacement

Quality Assurance and Warranty

Standard Ignition parts are manufactured to meet or exceed OEM standards for fit and function. The FJ304 fuel injector undergoes rigorous quality control to ensure reliable operation within the specified vehicle applications. This part comes with a limited warranty covering defects in materials and workmanship, providing confidence in its durability and performance.

BrandStandard Ignition
Part NumberFJ304
ColorWhite
Fuel Injector TypeMFI Injector
Fuel TypeGas
New or RemanNew
NotesIncludes O-Ring
System TypeTop Feed
Terminal GenderMale
Terminal TypeBlade

This part fits 8 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2000FordExplorer4.0LV6N/APerformance fuel injector fits various vehicle makes and models.
2000FordRanger4.0LV6N/APerformance fuel injector fits various vehicle makes and models.
2000MazdaB40004.0LV6N/APerformance fuel injector fits various vehicle makes and models.
1999FordExplorer4.0LV6N/Aw/ Calif. Emissions; New
1999FordRanger4.0LV6N/APerformance fuel injector fits various vehicle makes and models.
1999MazdaB40004.0LV6N/APerformance fuel injector fits various vehicle makes and models.
1999MercuryMountaineer4.0LV6N/Aw/ Calif. Emissions; New
1998MazdaB40004.0LV6N/APerformance fuel injector fits various vehicle makes and models.

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

142-273155-03262-38759217-169842-122054G127767359800-1307N842-12205CM4895F87Z9F593FAFIDL1307NFJ10536MP-10100ZZP213250A

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.