STANDARD MOTOR PRODUCTS FJ804 Fuel Injector
( Brand: Standard Motor Products ), ( Manufacturer Part Number: FJ804 ), ( Part Type: Fuel Injector Motor ), ( Manufacturer Warranty: No Warranty ), ( Mfr Code: 279 ), ( California Prop 65 Warning: This Product Contains A Chemical Known To The State Of California To Cause Cancer. )
Review STANDARD MOTOR PRODUCTS New Fuel Injector
The **Standard Motor FJ804 Fuel Injector** is a high-performance, precision-engineered component designed to deliver optimal fuel delivery in modern internal combustion engines, ensuring efficient combustion, enhanced power output, and improved fuel economy. Part of Standard Motor s trusted line of fuel injection systems, the FJ804 is meticulously crafted to meet the demanding requirements of high-performance and high-revving applications, including turbocharged, supercharged, and naturally aspirated engines. Constructed from durable materials, including high-grade stainless steel and corrosion-resistant alloys, this injector is built to withstand extreme operating conditions, including high-pressure fuel environments and prolonged exposure to heat and mechanical stress. Its robust design incorporates a sealed internal mechanism, minimizing the risk of fuel leaks and ensuring consistent performance over extended periods of use.
The FJ804 features a **multi-hole nozzle** configuration, allowing for precise atomization of fuel, which promotes better air-fuel mixture distribution within the combustion chamber. This design enhances combustion efficiency, reduces carbon buildup, and minimizes the likelihood of misfires or engine knocking, particularly in high-performance setups where fuel demand fluctuates rapidly. The injector operates within a wide pressure range, making it compatible with a variety of fuel systems, including direct injection and port injection applications. Its **electromagnetic solenoid** is engineered for rapid response, enabling quick opening and closing cycles that match the engine s demand for fuel with millisecond precision. This ensures smooth acceleration, better throttle response, and a more refined driving experience, even under heavy loads or high-speed conditions.
For ease of installation and maintenance, the FJ804 is equipped with a **threaded connection** compatible with standard fuel rail fittings, allowing for straightforward integration into existing fuel systems. The injector s **O-ring seals** provide a secure, leak-proof interface, while its **resistant coatings** help prevent corrosion and wear, extending its operational lifespan. Standard Motor s commitment to quality assurance means that each FJ804 undergoes rigorous testing for flow rate accuracy, durability, and reliability, ensuring that it meets or exceeds industry standards. Whether used in stock applications for improved performance or in high-end tuning scenarios, this injector serves as a dependable choice for enthusiasts and professionals seeking a balance of performance, durability, and cost-effectiveness. Its compatibility with a range of fuel types, including ethanol blends, further expands its versatility, making it a versatile upgrade for a wide array of vehicles.
### Pros and Cons of Buying a Standard Motor FJ804 Fuel Injector
#### **Pros:**1. **Compatibility and Fitment** The FJ804 fuel injector is specifically designed for the Ford FJ80 series (e.g., FJ60, FJ80, and some early FJ100 models). This ensures a direct fit without the need for extensive modifications, reducing installation complexity and potential issues.
2. **Reliability and Durability** Standard Motor is a well-established manufacturer known for producing high-quality aftermarket automotive parts. Their fuel injectors are built to last, often with robust materials and precise engineering to handle high-pressure fuel systems effectively.
3. **Performance Improvements** Upgrading to a new or high-quality injector can improve fuel delivery, leading to better engine performance, smoother operation, and potentially higher horsepower and torque if paired with a tuned engine management system.
4. **Fuel Efficiency** A properly functioning injector ensures optimal fuel atomization, which can enhance combustion efficiency. This may result in better fuel economy, especially if the original injectors were worn or clogged.
5. **Warranty and Support** Standard Motor typically offers warranties on their injectors, providing peace of mind against defects. Their customer support and availability of replacement parts are also generally reliable.
6. **Compatibility with Modifications** If you plan to modify your engine (e.g., forced induction, turbocharging, or performance tuning), the FJ804 injector can often handle increased fuel demands better than stock units, provided it is the correct flow rate.
7. **Ease of Installation** Since these injectors are designed for the FJ80 platform, they usually require minimal adaptation. Most can be installed as a direct replacement for the original injectors, reducing labor costs and time.
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#### **Cons:**1. **Cost** While not excessively expensive, fuel injectors are not cheap. A single Standard Motor FJ804 injector can cost between $50 and $150, depending on the model and flow rate. For a full set (typically 4 or 8 injectors), the cost can add up quickly, especially if labor is required for installation.
2. **Flow Rate Mismatch** If you are upgrading for performance reasons, you may need injectors with a higher flow rate than the stock units. Standard Motor offers various flow rates, but selecting the wrong one (either too high or too low) can lead to poor performance, fuel waste, or even engine damage if the system cannot keep up with demand.
3. **Compatibility with Modern Tuning** If your vehicle has been modified with a modern ECU (e.g., Haltech, MegaSquirt, or factory ECU with tuning), you may need to calibrate the injectors properly. Incorrect tuning can result in lean or rich fuel mixtures, reducing performance or causing damage.
4. **Installation Complexity** While the FJ804 injectors are designed for the platform, installation still requires careful handling. Improper installation (e.g., incorrect wiring, leaks, or improper sealing) can lead to fuel leaks, electrical issues, or poor performance. This may necessitate professional installation, adding to the cost.
5. **Potential for Counterfeit Parts** As with many aftermarket parts, there is a risk of purchasing counterfeit or low-quality injectors masquerading as Standard Motor products. Always buy from reputable dealers or authorized distributors to avoid this issue.
6. **Limited Customization** Unlike some high-end performance injectors, Standard Motor s FJ804 injectors may not offer as many customization options (e.g., different body styles, materials, or advanced features like sequential fueling). This can limit their suitability for highly modified or specialized builds.
7. **Maintenance Requirements** Fuel injectors require periodic cleaning or replacement if they become clogged with carbon deposits or other contaminants. Neglecting maintenance can lead to reduced performance or failure over time.
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### **Conclusion:**The Standard Motor FJ804 fuel injector is a solid choice for owners of Ford FJ80 series vehicles, particularly those looking to replace worn or failing stock injectors or upgrade for performance. Its compatibility, reliability, and ease of installation make it a practical option for both stock and lightly modified engines. However, the decision to purchase should consider factors such as budget, intended use (stock vs. performance), and the need for proper tuning and installation.
If your primary goal is to restore or maintain stock performance, the FJ804 injector is a straightforward and effective solution. For performance applications, ensure you select the correct flow rate and pair it with a compatible ECU tune to avoid issues. Always prioritize quality and authenticity when purchasing to guarantee optimal performance and longevity.
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### **Recommendation:**- **For Stock or Lightly Modified Engines:** Purchase a set of Standard Motor FJ804 injectors with the same flow rate as the originals (typically around 300-400 cc/min for naturally aspirated FJ80 engines). This ensures compatibility and reliability without unnecessary complexity.
- **For Performance Applications:** If you are adding forced induction or significant power, opt for injectors with a higher flow rate (e.g., 600-1000 cc/min or more, depending on your goals) and consult with a tuner to adjust fuel delivery accordingly. Consider pairing them with a high-quality fuel system (e.g., upgraded fuel pump, fuel rail, and fuel pressure regulator) to support the increased demand.
- **Installation:** If you lack experience with fuel systems, have a professional install the injectors to ensure proper wiring, sealing, and calibration. Improper installation can lead to serious issues.
- **Source:** Buy from authorized Standard Motor dealers or reputable aftermarket suppliers to avoid counterfeit parts. Check reviews or ask for recommendations within Ford FJ80 communities for trusted vendors.
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part #: fj804 prices
- $39.99-$89.25
specifications carfuelinjector:
- brand: Standard Motor Products
- mpn: Fj804
- part type: Fuel Injector Motor
- manufacturer warranty: No Warranty
- mfr code: 279
- california prop 65 warning: This Product Contains A Chemical Known To The State Of California To Cause Cancer.
shipping carfuelinjector:
- type: Fixed
- transit: 3-6 Days
- service: Standard
- cost: $0.00
- class: Standard
returns carfuelinjector:
- policy: Returns Accepted
- time: 30 Days
- paid by: Seller
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offer carfuelinjector:
- quantity: 2
- started: March 29, 2026
- sold: 0
- options: Ship-to-home
- availability: In Stock
seller carfuelinjector:
- # reviews: 4623
- rating: 99.8%
- city: Port Washington, New York
general carfuelinjector:
- condition: New
- Air Fuel Delivery > Fuel Injection Parts > Fuel Injectors
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