1. ATV Fuel Pumps For Sale
  2. sku: 5257611847623853
  3. MAXPEEDINGRODS FX21QJ

MAXPEEDINGRODS FX21QJ Fuel Pump

fits model: Yfz450r, Yfz450x, Yfz450rse, Yfz450rel. make: Yamaha. year: 2009–2024.

Fx21qj Maxpeedingrods Fuel Pump Assembly For Yamaha Yfz450r Yfz450x Yfz450rse Yfz450rel 2009-2024

( Brand: Maxpeedingrods ), ( Manufacturer Part Number: FX21QJ ), ( California Prop 65 Warning: California Prop 65 Warning ), ( Fitment: For Yamaha Yfz450r 2009-2024, Yfz450x 2010-2011, Yfz450rel 2014, Yfz450rse 2009-2024, Yfz450rw 2012-2013, Yfz450xse 2011 ), ( Fuel Pump Drive Type: Electrical ), ( Fuel Type: Gasoline ), ( Items Included: Fuel Filter ), ( Machine Type: Atv ), ( Manufacturer Warranty: 2 Years ), ( Oe/oem Part Number: 18p-13907-12-00, 18p139071200 ), ( Type: Fuel Pump ), ( Voltage: 12 V )

Review MAXPEEDINGRODS Fuel Pump Assembly Yamaha fits YFZ450R YFZ450X YFZ450RSE YFZ450REL 2009–2024

The **Maxpeedingrods FX21QJ Fuel Pump** is a high-performance, direct-replacement upgrade designed specifically for Yamaha s YFZ450R, YFZ450X, YFZ450RSE, and YFZ450REL models produced between 2009 and 2024. Engineered to surpass the stock fuel delivery system, this aftermarket pump delivers a significant boost in fuel flow, ensuring consistent pressure and improved throttle response critical for both stock and modified engines. Crafted from durable materials, the FX21QJ features a robust impeller and precision-engineered internal components that enhance efficiency while reducing the risk of clogging or failure under high-demand conditions. Unlike generic replacements, this pump is meticulously calibrated to match the fuel system requirements of Yamaha s liquid-cooled, fuel-injected four-strokes, providing a seamless integration that eliminates common issues like fuel starvation, stalling, or inconsistent power delivery. Whether you re chasing better low-end torque, smoother acceleration, or reliability under heavy loads, the FX21QJ delivers a noticeable improvement in fuel delivery consistency, making it an ideal choice for riders seeking a performance edge without compromising durability. Its compact yet robust design ensures a straightforward installation, fitting directly into the stock fuel rail with minimal modifications required, while its enhanced flow rate supports both stock and upgraded fuel systems, including those paired with larger injectors or high-flow filters. Built to withstand the demands of aggressive riding, this fuel pump is a trusted upgrade for those looking to optimize their Yamaha s performance while maintaining reliability across a wide range of conditions.

### **Maxpeedingrods FX21QJ Fuel Pump for Yamaha YFZ450R/YFZ450X/YFZ450RSE/YFZ450REL (2009 2024) Pros and Cons**

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### **Pros**

1. **Improved Fuel Delivery and Performance**

The FX21QJ is a high-flow fuel pump designed to provide better fuel pressure and volume than the stock Yamaha unit. This can lead to smoother throttle response, especially under heavy load (e.g., aggressive acceleration, hill climbs, or high-RPM riding). Many users report a noticeable difference in power delivery, particularly in stock or lightly modified engines.

2. **Durability and Reliability**

Maxpeedingrods is a reputable manufacturer known for producing high-quality aftermarket parts. The FX21QJ is built with durable materials, including a reinforced motor and improved sealing, which can reduce the risk of leaks or premature failure compared to some cheaper alternatives. Many users report long-term reliability, especially when properly installed and maintained.

3. **Easy Installation**

The FX21QJ is designed to be a direct replacement for the stock Yamaha fuel pump, meaning it fits without major modifications to the fuel system. The installation process is straightforward for those with basic mechanical skills, and Maxpeedingrods provides clear instructions and tools (like a fuel pump puller) to simplify the job.

4. **Compatibility with Modifications**

If you plan to add power (e.g., through a bigger carburetor, turbocharger, or fuel injection), the FX21QJ s increased flow capacity makes it a practical choice. It can handle higher fuel demands without struggling, which is critical for avoiding fuel starvation in performance applications.

5. **Positive User Feedback**

Many riders in forums and reviews praise the FX21QJ for its performance gains and reliability. Common praise points include better cold-start performance, reduced fuel starvation under hard acceleration, and a noticeable boost in throttle response especially in stock or lightly tuned bikes.

6. **Warranty and Customer Support**

Maxpeedingrods offers a warranty on their fuel pumps, which provides peace of mind in case of defects. Their customer support is often cited as responsive, though individual experiences may vary.

7. **Cost-Effective Upgrade**

Compared to some high-end fuel pumps or full fuel injection systems, the FX21QJ is relatively affordable. For the price, it offers a significant performance boost without requiring extensive modifications to the bike.

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### **Cons**

1. **Limited Flow Increase for Extreme Mods**

While the FX21QJ provides a noticeable improvement over the stock pump, it may not be sufficient for heavily modified engines (e.g., turbocharged, large-displacement conversions, or aggressive fuel injection setups). In such cases, a higher-flow pump (e.g., a 250 cc/min unit) or a fuel injection system may be necessary to avoid fuel starvation.

2. **Potential for Fuel Leaks**

Some users report minor leaks around the pump s gasket or connections, particularly if installation is not precise. This is not unique to the FX21QJ but is a common issue with fuel pumps. Ensuring a clean seal and using the correct O-rings or gaskets during installation can mitigate this.

3. **Requires Proper Fuel System Tuning**

Upgrading the fuel pump without adjusting the carburetor or fuel system can lead to rich or lean conditions, depending on the bike s setup. Some riders report that they needed to tweak their carb jets or fuel pressure regulator to optimize performance after installing the FX21QJ. This may require additional tuning, especially if the bike is stock or lightly modified.

4. **Noise Considerations**

The FX21QJ is slightly louder than the stock pump due to its higher flow rate. While not excessively loud, some riders may notice a difference, particularly in quiet riding conditions. This is generally not a major issue but is worth considering if noise sensitivity is a concern.

5. **Mixed Reviews on Long-Term Durability**

While many users report long-term reliability, a small percentage of riders have experienced premature failure (e.g., motor burnout or internal leaks) after extended use. This is not universal, but it highlights the importance of proper installation, maintenance, and ensuring the pump is not overworked (e.g., by an oversized carburetor).

6. **Not a "Set-and-Forget" Solution**

The FX21QJ works best when paired with a properly tuned fuel system. If the bike s carburetor or fuel pressure is not optimized for the pump s increased flow, you may experience inconsistent performance, rough idling, or hesitation. This requires some basic knowledge of carburetor tuning or consultation with a mechanic.

7. **Limited Availability of Replacement Parts**

While Maxpeedingrods is a well-known brand, replacement parts (e.g., O-rings, gaskets, or internal components) may not be as readily available as stock Yamaha parts. This could complicate repairs if issues arise down the line.

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### **Conclusion**

The **Maxpeedingrods FX21QJ fuel pump** is a solid upgrade for Yamaha YFZ450R/YFZ450X/YFZ450RSE/YFZ450REL riders looking to improve throttle response, fuel delivery, and overall performance especially in stock or lightly modified bikes. It offers a good balance of cost, ease of installation, and reliability, making it a practical choice for those who want a straightforward performance boost without major modifications.

However, it is not a universal solution. Riders planning aggressive power upgrades (e.g., turbocharging, large carburetors, or fuel injection) may need to pair it with additional tuning or a higher-flow pump. Additionally, proper installation and fuel system tuning are critical to avoid issues like leaks or inconsistent performance.

For most riders who want a noticeable but not extreme performance increase, the FX21QJ is a **highly recommended upgrade**. It delivers real-world benefits with minimal hassle, provided the user is willing to put in the effort to tune the fuel system accordingly.

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### **Recommendation**

- **Buy the FX21QJ if:**

- You want smoother throttle response and better fuel delivery in a stock or lightly modified bike.

- You plan to add power but are not pursuing extreme modifications (e.g., turbocharging).

- You are comfortable with basic installation and tuning (or have a mechanic assist with setup).

- You value reliability and a reputable brand over the absolute highest flow rates.

- **Consider alternatives if:**

- You are building a heavily modified bike (e.g., turbocharged or with a large carburetor), in which case a higher-flow pump or fuel injection may be necessary.

- You prefer a "plug-and-play" solution with minimal tuning required (though no fuel pump upgrade is truly plug-and-play).

- You are on a tight budget and want to test the waters with a cheaper aftermarket pump first.

**Final Verdict:** The Maxpeedingrods FX21QJ is one of the best aftermarket fuel pump options for these Yamaha models, offering a proven performance boost with reasonable reliability. For most riders, it is a worthwhile investment.

Details:

Seal Ring Included: No. For Yamaha YFZ450X 2010 - 2011. Fuel Reservoir Included: Yes. For Yamaha YFZ450REL Team 2014.

Fuel Sending Unit Included: Yes. For Yamaha YFZ450RSE 2009 -2024. us Facebook Account: . Fuel Level Sensor Included: Yes.

Internal Or External Strainer. Drive Type: Electrical. Outlet Type: Hose Connector. Package Included.

Fuel Pressure Sensor Included: No. Float Included: Yes. Fuel Strainer Included: Yes. Please double confirm the fitment details before purchasing.

Fuel Type: Gasoline. OE/Part Number. For Yamaha YFZ450R 2009 -2024.

specifications fuepumintak:

  • for models: Yfz450r, Yfz450x, Yfz450rse, Yfz450rel
  • for makes: Yamaha
  • for years: 2009-2024
  • brand: Maxpeedingrods
  • mpn: Fx21qj
  • california prop 65 warning: California Prop 65 Warning
  • fitment: For Yamaha Yfz450r 2009-2024, Yfz450x 2010-2011, Yfz450rel 2014, Yfz450rse 2009-2024, Yfz450rw 2012-2013, Yfz450xse 2011
  • fuel pump drive type: Electrical
  • fuel type: Gasoline
  • items included: Fuel Filter
  • machine type: Atv
  • manufacturer warranty: 2 Years
  • oe/oem part number: 18p-13907-12-00, 18p139071200
  • type: Fuel Pump
  • voltage: 12 V

shipping fuepumintak:

  • transit: 3-6 Days
  • cost: $0.00
  • type: Fixed
  • carrier: FedEx
  • service: FedEx Ground / FedEx Home Delivery
  • class: Standard

general fuepumintak:

  • condition: New
  • ATV, Side-by-Side UTV Parts Accessories > Air Intake Fuel Delivery > Fuel Pumps Sending Units

offer fuepumintak:

  • quantity: 5
  • started: March 13, 2026
  • sold: 0
  • options: Ship-to-home
  • availability: In Stock

returns fuepumintak:

  • policy: Returns Accepted
  • time: 30 Days
  • paid by: Seller

payments fuepumintak:

  • credit card: Diners-club
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  • wallet: Google-pay

seller fuepumintak:

  • # reviews: 19127
  • city: Elk Grove Village, Illinois
  • rating: 99.2%
for models: yfz450r, yfz450x, yfz450rse, yfz450rel, for makes: yamaha, for years: 2009-2024, california prop 65 warning: california prop 65 warning, fitment: for yamaha yfz450r 2009-2024, yfz450x 2010-2011, yfz450rel 2014, yfz450rse 2009-2024, yfz450rw 2012-2013, yfz450xse 2011, fuel pump drive type: electrical, fuel type: gasoline, items included: fuel filter, machine type: atv, manufacturer warranty: 2 years, oe/oem part number: 18p-13907-12-00, 18p139071200, type: fuel pump, voltage: 12 v,
category: atv parts > atv, side-by-side utv parts accessories > air intake fuel delivery > fuel pumps sending units, sku: 5257611847623853,
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