GATES SX-6307 Fuel Tank Cap Fq 3.5L 3.8L 4.1L 5.3L 5.7L

( Brand: Gates ), ( Manufacturer Part Number: SX-6307 ), ( 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: C480 58-21 ), ( Compatible Year: 1974 1973 1972 1971 1970 1969 1968 1967 1966 1965 ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement ), ( Bundle Description: 1 Pc Genuine Gates Fuel Tank Cap )

Review GATES Fuel Tank Cap Pontiac 3.5l 3.8l 4.1l 5.3l 5.7l Fq fits LEMANS 1965–1974

The **Gates SX-6307 Fuel Tank Cap** is a meticulously engineered, high-performance replacement part designed specifically for the iconic 1965 through 1974 Pontiac Lemans with a range of legendary 3.5L, 3.8L, 4.1L, 5.3L, and 5.7L F-body engines, including the legendary Firebird and Trans Am variants. Crafted from durable, corrosion-resistant materials, this fuel tank cap is built to withstand the demands of high-performance driving while maintaining a sleek, factory-inspired appearance. The cap features a robust, threaded design that ensures a secure, airtight seal, preventing fuel vapors from escaping and reducing the risk of evaporative emissions, which is particularly important for maintaining optimal engine performance and fuel efficiency. Its precision-machined components guarantee a snug fit on the fuel filler neck, eliminating leaks and ensuring a smooth, reliable operation even under heavy acceleration or aggressive driving conditions. The Gates SX-6307 is not just a functional replacement it s a nod to the classic styling of the original, with a clean, aerodynamic silhouette that complements the aggressive stance of the F-body s iconic muscle-car heritage. Whether you're restoring a vintage Lemans to its former glory or upgrading a modern high-performance build, this fuel tank cap delivers both form and function, ensuring that your vehicle s fuel system operates with the same precision and reliability as the engines it powers. Built to last, the Gates SX-6307 is an essential component for enthusiasts who demand nothing less than perfection in every detail.

### **Pros and Cons of Buying a Gates SX-6307 Fuel Tank Cap for 1965 1974 Pontiac Lemans (3.5L 5.7L FQ Engines)**

1. **Direct Fitment** The Gates SX-6307 is specifically designed for Pontiac Lemans (and other F-body models) from 1965 to 1974, ensuring compatibility with the 3.5L, 3.8L, 4.1L, 5.3L, and 5.7L FQ engines. This eliminates the need for modifications or adapters.

2. **High-Quality Material** Gates is a well-known manufacturer of fuel system components, and their caps are typically made from durable, corrosion-resistant materials, reducing the risk of leaks or failure over time.

3. **Sealed Design** The cap features a reliable sealing mechanism, which helps prevent fuel vapors from escaping and keeps moisture out, protecting the fuel system from contamination.

4. **Easy Installation** The design is straightforward, making it a relatively simple DIY replacement for those with basic mechanical skills. No specialized tools are usually required.

5. **Compatibility with Aftermarket Fuel Systems** If you ve modified your fuel system (e.g., added a fuel pump, pressure regulator, or secondary fuel tank), this cap will integrate smoothly without conflicts.

6. **Long-Term Reliability** Gates components are known for lasting longer than generic or low-quality alternatives, reducing the likelihood of frequent replacements.

7. **Availability** This part is widely stocked by performance parts retailers, making it easy to purchase online or in-store.

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1. **Cost** Compared to generic or aftermarket fuel tank caps, the Gates SX-6307 may be more expensive. However, the price reflects its quality and reliability.

2. **Potential Overkill for Stock Applications** If you re not running a modified fuel system or high-performance setup, a stock Pontiac cap (if still functional) might suffice, saving money.

3. **Fuel System Compatibility Concerns (Rare)** While rare, some older fuel systems (especially those with high-mileage or degraded seals) may still leak around the cap even with a Gates product. Ensuring the fuel tank itself is intact is critical.

4. **Thread Stripping Risk (If Over-Tightened)** Like any fuel cap, improper installation (e.g., excessive torque) could strip the threads on the tank or cap. Using a torque wrench or applying even, moderate pressure is recommended.

5. **Limited Customization** Unlike some aftermarket caps, the Gates SX-6307 does not offer additional features like pressure relief valves or specialized sealing compounds, which may be desired in extreme performance applications.

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### **Conclusion**

The **Gates SX-6307 fuel tank cap** is an excellent choice for Pontiac Lemans owners, particularly those who prioritize **reliability, direct fitment, and long-term performance**. Its high-quality construction and compatibility with a wide range of FQ engines make it a strong investment, especially if you plan to keep the vehicle for years or run modifications. However, if you re on a tight budget and the stock cap is still functional, the extra cost may not be justified.

For most **restoration projects, performance builds, or long-term ownership**, the Gates cap is **highly recommended** due to its durability and peace of mind. If you re unsure, checking for leaks in the existing cap before purchasing is wise sometimes a simple replacement of the O-ring or a thorough cleaning resolves issues without needing a full upgrade.

- You want a reliable, long-lasting replacement.

- You re modifying the fuel system or running a high-mileage vehicle.

- You prefer a brand known for quality over generic alternatives.

- The stock cap is still functional and you re not planning modifications.

- You re working with a very tight budget and can find a verified alternative at a lower cost.

Details:

Gates Fuel Tank Cap for 1965-1974 Pontiac LeMans 3.5L 3.8L 4.1L 5.3L 5.7L fq: Status: In Stock.

part #: sx6307 prices

• $25.61-$58.40

specifications fueltanksysteme:

• for models: Lemans
• for makes: Pontiac
• for years: 1965-1974
• brand: Gates
• mpn: Sx-6307
• 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: C480 58-21
• compatible year: 1974 1973 1972 1971 1970 1969 1968 1967 1966 1965
• core charge: Free No Core Charge
• fitment type: Direct Replacement
• bundle description: 1 Pc Genuine Gates Fuel Tank Cap

seller fueltanksysteme:

• city: Indianapolis, Indiana
• # reviews: 661556
• rating: 99.6%

general fueltanksysteme:

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

returns fueltanksysteme:

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

offer fueltanksysteme:

• started: May 26, 2026
• quantity: 10
• availability: In Stock
• sold: 0
• options: Ship-to-home

payments fueltanksysteme:

• other
• credit card: Mastercard
• wallet: Apple-pay

shipping fueltanksysteme:

• transit: 3-6 Days
• cost: $0.00
• service: Standard, Expedited
• class: Standard, Expedited
• type: Fixed

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