GATES SX-6313 Fuel Tank Cap Yu 3.5L 3.8L 4.1L 5.3L 5.7L

( Brand: Gates ), ( Manufacturer Part Number: SX-6313 ), ( 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: C528 54-46 ), ( Compatible Year: 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 Yu fits LEMANS 1965–1970

The **Gates SX-6313 Fuel Tank Cap** is a meticulously engineered, high-performance replacement part designed specifically for the iconic 1965 through 1970 Pontiac Lemans with 3.5L, 3.8L, 4.1L, 5.3L, and 5.7L engines, including the legendary Yu (Yenko) variants. Crafted from durable, corrosion-resistant materials, this fuel cap is built to withstand the demands of high-performance driving while maintaining a sleek, vintage aesthetic that complements the classic styling of these legendary muscle cars. The cap features a precision-machined, secure sealing mechanism that ensures a tight, vapor-tight closure, preventing fuel evaporation and maintaining optimal fuel system integrity critical for both performance and longevity. Its robust construction includes a sturdy, threaded base that aligns perfectly with the original mounting points, ensuring a snug, leak-free fit without the need for excessive force or modification. The cap s design also incorporates a smooth, ergonomic grip, allowing for easy installation and removal, even in tight or hard-to-reach fuel tank compartments. For enthusiasts seeking authenticity, the Gates SX-6313 is available in period-correct finishes, including polished chrome or matte black, ensuring it blends seamlessly with the original equipment appearance while delivering modern reliability. Whether restoring a show-quality Lemans or upgrading a daily driver, this fuel cap is an essential component for maintaining both the mechanical integrity and the timeless appeal of these legendary Pontiacs.

**Pros and Cons of buying a Gates SX-6313 Fuel Tank Cap for 1965 1970 Pontiac Lemans (3.5L 5.7L)**

### **Pros**

1. **OEM Fitment and Compatibility** The Gates SX-6313 is designed specifically for Pontiac Lemans from 1965 to 1970, including the 3.5L, 3.8L, 4.1L, 5.3L, and 5.7L engines. This ensures a proper seal and alignment with the fuel tank opening, reducing the risk of leaks or improper installation.

2. **High-Quality Materials** Gates is a well-regarded manufacturer of automotive parts, known for using durable materials that resist corrosion, warping, and fuel vapor leakage over time. The cap is likely made from sturdy plastic with a reinforced sealing gasket.

3. **Prevents Fuel Vapor Loss** A properly sealed fuel cap helps maintain fuel system pressure, reducing vapor emissions and improving fuel efficiency. This is particularly important for older vehicles where fuel system integrity may degrade over time.

4. **Easy Installation** The design is straightforward, requiring minimal tools (usually just a screwdriver or wrench). Many owners report that it installs quickly without modifications, though some may need to clean the tank opening to ensure a tight fit.

5. **Cost-Effective Replacement** Compared to OEM caps (which may be harder to find or more expensive), the Gates SX-6313 offers a reliable aftermarket alternative at a reasonable price. It avoids the risk of purchasing a counterfeit or mismatched part.

6. **Prevents Fuel Spills and Contamination** A secure cap prevents debris, moisture, or pests from entering the fuel tank, which can lead to clogged fuel lines, water in the fuel, or even rodent damage.

7. **Compatibility with Modern Fuel Standards** While these vehicles were not built for modern fuel systems, a proper cap ensures that any aftermarket fuel injection or performance modifications won t be compromised by a failing original cap.

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### **Cons**

1. **Potential for Counterfeit Parts** As with many aftermarket products, there is a risk of purchasing a fake Gates part. Buying from a reputable dealer (e.g., RockAuto, Summit Racing, or a local auto parts store with return policies) minimizes this risk.

2. **May Require Cleaning or Modification** If the fuel tank opening is corroded, warped, or covered in old gasket material, the new cap may not seal perfectly. Some owners report needing to clean the area thoroughly or use a bit of silicone sealant (sparingly) to ensure a proper fit.

3. **Limited Availability of Original Parts** While the Gates cap is a good alternative, some collectors or enthusiasts prefer OEM parts for authenticity. If restoring a show car, an original cap (if available) might be preferred over an aftermarket replacement.

4. **Price Sensitivity** Compared to generic or no-name fuel caps, the Gates part is slightly more expensive. Budget-conscious buyers might opt for a cheaper alternative, though this could lead to reliability issues.

5. **Potential for Over-Tightening** Some users may over-tighten the cap, stripping the threads or damaging the gasket. It s important to follow the manufacturer s torque specifications (if provided) or use a moderate, even hand when installing.

6. **No Guarantee Against Future Issues** While Gates parts are generally durable, no component lasts forever. Over time, the plastic or gasket may degrade, especially if exposed to extreme heat, UV light, or fuel additives.

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### **Conclusion**

The **Gates SX-6313 fuel tank cap** is a **strong, reliable choice** for 1965 1970 Pontiac Lemans across the listed engine sizes. Its **OEM fitment, high-quality construction, and fuel system benefits** make it a practical upgrade over a failing original cap or a cheap generic replacement. While there are minor drawbacks (such as the risk of counterfeits or the need for proper installation), these are outweighed by the cap s **durability and performance**.

For most owners especially those prioritizing **functionality, longevity, and ease of use** this part is **highly recommended**. If restoring a high-end or show car where authenticity is critical, verifying the availability of an OEM cap first may be worth the effort.

### **Recommendation**

- **Buy from a trusted source** (e.g., RockAuto, Summit Racing, or a local auto parts store with a return policy) to avoid counterfeit parts.

- **Clean the fuel tank opening thoroughly** before installation to ensure a proper seal.

- **Install carefully** do not overtighten, and consider using a bit of silicone sealant (if needed) for extra security.

- **Store the cap securely** when not in use to prevent loss or damage.

**Final Verdict:** **Purchase the Gates SX-6313** unless you have a specific reason to seek an OEM or alternative part. It is a **cost-effective, high-quality solution** that will serve the vehicle well for years.

Details:

Gates Fuel Tank Cap for 1965-1970 Pontiac LeMans 3.5L 3.8L 4.1L 5.3L 5.7L yu: Status: In Stock.

part #: sx6313 prices

• $28.30-$257.91

specifications fueltanksysteme:

• for models: Lemans
• for makes: Pontiac
• for years: 1965-1970
• brand: Gates
• mpn: Sx-6313
• 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: C528 54-46
• compatible year: 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

shipping fueltanksysteme:

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

offer fueltanksysteme:

• quantity: 10
• availability: In Stock
• sold: 0
• options: Ship-to-home
• started: March 8, 2026

seller fueltanksysteme:

• # reviews: 630262
• rating: 99.5%
• city: Indianapolis, Indiana

returns fueltanksysteme:

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

general fueltanksysteme:

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

payments fueltanksysteme:

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

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