GATES SX-3721 Fuel Tank Gas Cap Storage 4.5L V8

( Brand: Gates ), ( Manufacturer Part Number: SX-3721 ), ( Type: Fuel Tank Cap ), ( Placement On Vehicle: Air Fuel Delivery Hardware Fasteners Fittings ), ( Item Width: 3.630 ), ( Item Height: 3.000 ), ( Manufacturer Warranty: Recommended Service Interval ), ( Ipn: C397 42-56 ), ( Compatible Year: 2009 2008 2007 2006 2005 2004 2003 ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement ), ( Bundle Description: 1 Pc Genuine Gates Fuel Tank Cap )

Review GATES Fuel Tank Cap Infiniti 4.5l V8 Gas Delivery Storage fits M45 YZ 2003–2009

The **Gates SX-3721 Fuel Tank Cap** is a meticulously engineered, high-performance replacement part designed specifically for the **2003 2009 Infiniti M45** equipped with the **4.5L V8 gasoline-powered engine**. Crafted with precision and built to exacting standards, this fuel tank cap ensures a secure, airtight seal while maintaining optimal fuel system integrity. The cap features a **durable, corrosion-resistant construction**, utilizing high-grade materials to withstand the harsh conditions of frequent use, temperature fluctuations, and exposure to fuel vapors, thereby preventing leaks and maintaining fuel efficiency. Its **threaded design** is engineered to match the original equipment manufacturer (OEM) specifications, guaranteeing a snug fit that eliminates any potential for fuel evaporation or contamination. The cap also incorporates a **vapor recovery system**, which helps minimize emissions by trapping and recirculating fuel vapors back into the tank, adhering to modern environmental regulations. Whether you're restoring an M45 to its original condition or performing routine maintenance, this Gates SX-3721 cap is an ideal choice for enthusiasts and mechanics alike who demand reliability, durability, and performance. Its compatibility with the **M45 s fuel storage system** ensures seamless integration, making it a trusted upgrade for those seeking both functionality and longevity in their vehicle s fuel management.

**Pros and Cons of buying a Gates SX-3721 Fuel Tank Cap for a 2003-2009 Infiniti M45 (4.5L V8 Gas Storage YZ)**

1. **OEM Compatibility** The Gates SX-3721 is designed as an original equipment replacement part, meaning it matches the factory specifications for your Infiniti M45. This ensures proper fitment, functionality, and compatibility with the vehicle s fuel system.

2. **Durability and Quality** Gates is a well-known manufacturer of automotive parts, particularly for fuel system components. Their products are generally built to last, offering reliable sealing and resistance to fuel vapors, moisture, and temperature fluctuations.

3. **Prevents Fuel Evaporation and Emissions Leaks** A properly functioning fuel cap helps maintain the vehicle s evaporative emissions system (EVAP) by sealing the fuel tank. This prevents fuel vapors from escaping, which is important for passing emissions tests and avoiding potential check engine lights.

4. **Easy Installation** The cap is straightforward to install, requiring no special tools beyond a basic socket or wrench. Most drivers can replace it themselves in a few minutes.

5. **Cost-Effective Solution** Compared to some aftermarket alternatives, the Gates cap is reasonably priced while still offering OEM-level quality. It avoids the risk of purchasing a low-quality knockoff that could fail prematurely.

6. **Compatibility with Aftermarket Mods** If you ve modified your vehicle s fuel system (e.g., added a fuel cap delete or modified EVAP system), this cap can still serve as a reliable stopgap solution until a more customized part is installed.

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1. **Potential for Counterfeit Products** Since Gates parts are widely available, there is a risk of purchasing a counterfeit or low-quality imitation, especially if buying from untrusted online sellers. Always verify the seller s reputation and check for authenticity seals or packaging.

2. **Limited Customization** If you ve removed the fuel cap for performance reasons (e.g., reducing backpressure in a high-flow fuel system), this standard OEM cap won t provide any performance benefits. In such cases, a specialized aftermarket cap (e.g., with a larger vent or different sealing mechanism) may be needed.

3. **Wear and Tear Over Time** Like any rubber or plastic component, the sealing gasket inside the cap can degrade over time due to exposure to fuel vapors, heat, and UV light. If the cap is old or has been exposed to extreme conditions, it may need replacement sooner than expected.

4. **No Additional Features** The Gates SX-3721 is a basic fuel cap with no extra features like pressure relief valves, temperature-resistant coatings, or compatibility with alternative fuels. If you require specialized functionality, you may need to look elsewhere.

5. **Possible Misalignment Issues** If the fuel tank s filler neck or surrounding area is damaged or misaligned, the cap may not seal properly, leading to leaks or EVAP system issues. In such cases, addressing the underlying problem (e.g., repairing the filler neck) may be necessary.

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The Gates SX-3721 fuel tank cap is a solid choice for replacing a worn-out or damaged OEM cap on your 2003-2009 Infiniti M45. It offers reliability, compatibility, and ease of installation, making it a practical option for most drivers. However, if you re looking for performance modifications or have concerns about counterfeit products, additional research or alternative parts may be warranted.

For standard replacement purposes such as fixing a loose or leaking cap the Gates part is highly recommended due to its quality and trustworthiness. Always ensure you purchase from a reputable source to avoid counterfeit items.

- **Buy the Gates SX-3721** if you need a direct OEM replacement for your Infiniti M45 s fuel cap, especially for emissions compliance or fixing a leak.

- **Verify the seller s authenticity** to avoid counterfeit parts. Look for reviews, return policies, and direct purchases from authorized dealers or well-known online retailers.

- **Consider an aftermarket alternative** only if you have specific needs (e.g., fuel cap deletion for performance tuning) and are willing to research specialized options.

- **Inspect the fuel tank area** before installation to ensure no other issues (e.g., cracked filler neck) are contributing to leaks or EVAP problems.

Details:

Gates Fuel Tank Cap for 2003 - 2009 Infiniti M45 4.5L V8 Gas Delivery storage Yz: Status: In Stock.

part #: sx3721 prices

• $37.03-$132.43

specifications fueltanksysteme:

• for models: M45, Yz
• for makes: Infiniti
• for years: 2003-2009
• brand: Gates
• mpn: Sx-3721
• type: Fuel Tank Cap
• placement on vehicle: Air Fuel Delivery Hardware Fasteners Fittings
• item width: 3.630
• item height: 3.000
• manufacturer warranty: Recommended Service Interval
• ipn: C397 42-56
• compatible year: 2009 2008 2007 2006 2005 2004 2003
• core charge: Free No Core Charge
• fitment type: Direct Replacement
• bundle description: 1 Pc Genuine Gates Fuel Tank Cap

payments fueltanksysteme:

• credit card: Diners-club
• wallet: Apple-pay
• other

seller fueltanksysteme:

• rating: 99.5%
• # reviews: 627067
• city: Indianapolis, Indiana

offer fueltanksysteme:

• options: Ship-to-home
• sold: 0
• quantity: 10
• started: February 28, 2026
• availability: In Stock

returns fueltanksysteme:

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

general fueltanksysteme:

• Car Truck Parts Accessories > Air Fuel Delivery > Fuel Tanks Filler Necks
• condition: New

shipping fueltanksysteme:

• class: Standard, Expedited
• service: Standard, Expedited
• cost: $0.00
• type: Fixed
• transit: 4-7 Days

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