GATES SX-5690 Fuel Tank Gas Cap Gz 6.6L 7.5L V8

( Brand: Gates ), ( Manufacturer Part Number: SX-5690 ), ( Type: Fuel Tank Cap ), ( Placement On Vehicle: Air Fuel Delivery Hardware Fasteners Fittings ), ( Item Height: 3.000 ), ( Item Width: 3.630 ), ( Manufacturer Warranty: Recommended Service Interval ), ( Ipn: C425 54-32 ), ( 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 6.6l 7.5l V8 Gas Delivery Gz fits BONNEVILLE 1970

The **Gates SX-5690 Fuel Tank Cap** is a meticulously engineered, high-performance replacement for the original fuel filler cap found on the iconic 1970 Pontiac Bonneville, specifically tailored for the robust 6.6L and 7.5L V8 engines (commonly referred to as the "GZ" or "Tri-Power" models). Crafted from durable, corrosion-resistant materials, this cap is designed to withstand the demanding conditions of high-performance driving while maintaining a sleek, factory-inspired aesthetic. The SX-5690 features a precision-machined aluminum body, ensuring a lightweight yet sturdy construction that complements the Bonneville s powerful V8 engine. Its robust sealing mechanism guarantees an airtight fit, preventing fuel vapors from escaping while also minimizing the risk of moisture or debris entering the fuel system, which is critical for maintaining optimal engine performance and longevity. The cap s ergonomic design includes a smooth, contoured lid that fits comfortably in the hand, allowing for easy installation and removal, even in tight spaces. The integrated pressure relief valve is engineered to handle the elevated fuel pressures associated with high-performance applications, reducing the likelihood of leaks or blowouts under heavy acceleration or aggressive driving conditions. For enthusiasts seeking authenticity, the SX-5690 replicates the original Bonneville s distinctive styling cues, including the iconic ribbed texture and precise fitment, ensuring a seamless integration with the vehicle s fuel filler neck. Whether restoring a classic Bonneville to its original glory or upgrading a modernized engine bay, this Gates fuel cap delivers both functionality and heritage, making it an essential component for any true Bonneville aficionado.

### Pros and Cons of Buying a Gates SX-5690 Fuel Tank Cap for a 1970 Pontiac Bonneville (6.6L/7.5L V8 Gas/GZ)

1. **Compatibility and Fit:** The Gates SX-5690 is specifically designed for Pontiac models from the late 1960s and early 1970s, including the Bonneville with the 6.6L (390 CID) and 7.5L (455 CID) V8 engines. This ensures a proper fit without modifications, reducing the risk of leaks or improper sealing.

2. **Durability:** Gates is a well-known brand in automotive aftermarket parts, known for producing high-quality, long-lasting components. The SX-5690 is made from sturdy materials, including metal and rubber seals, which should resist wear and corrosion over time.

3. **Seal Integrity:** A properly sealed fuel tank cap prevents fuel vapors from escaping, which helps maintain fuel efficiency and reduces environmental pollution. It also minimizes the risk of fuel odor in the cabin and prevents potential fire hazards from stray vapors.

4. **Easy Installation:** The design of the Gates SX-5690 is straightforward, making it relatively easy to install without requiring specialized tools or mechanical expertise. This can save time and labor costs compared to more complex replacements.

5. **Availability and Support:** Gates parts are widely available through automotive retailers, online marketplaces, and specialty shops. Additionally, Gates provides customer support and warranties, offering recourse if the part fails prematurely.

6. **Prevents Fuel Loss:** A faulty or missing fuel cap can cause fuel to evaporate, leading to reduced fuel economy. Replacing it with a reliable cap like the Gates SX-5690 helps maintain optimal fuel levels and performance.

7. **Aesthetic Match:** The Gates cap is designed to match the original appearance of the Bonneville s fuel tank cap, ensuring the vehicle retains its classic look without unsightly aftermarket modifications.

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1. **Cost:** While not excessively expensive, the Gates SX-5690 may be slightly more costly than generic or no-name fuel caps. For a classic car owner, this could be a minor consideration, but it s still an upfront expense to factor in.

2. **Potential for Counterfeit Parts:** Purchasing from untrusted sellers (especially online) could result in receiving a counterfeit or low-quality replica. Always buy from reputable dealers or verified sellers to avoid this risk.

3. **Sticking or Seizing:** Over time, fuel tank caps can develop sticking issues due to dirt, debris, or corrosion. While the Gates cap is durable, it may still require occasional cleaning or lubrication to ensure smooth operation.

4. **Limited Customization:** If you re looking for a unique or non-standard cap (e.g., a chrome finish or a different style), the Gates SX-5690 offers minimal customization options. It is a functional replacement rather than a decorative upgrade.

5. **Installation Challenges:** Although generally easy, some users may encounter difficulties if the surrounding area (e.g., the fuel tank opening or adjacent components) is corroded or damaged. In such cases, additional cleaning or repairs may be needed before installation.

6. **Environmental Concerns:** While the Gates cap reduces fuel vapor emissions, improper disposal of old fuel caps (if not recycled) could pose minor environmental risks. However, this is a general concern with any automotive part and not specific to the Gates product.

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The Gates SX-5690 fuel tank cap is an excellent choice for a 1970 Pontiac Bonneville with a 6.6L or 7.5L V8 engine. Its primary strengths lie in its compatibility, durability, and reliability, making it a practical and long-term solution for maintaining the vehicle s fuel system. The minor drawbacks such as cost, potential counterfeit risks, or occasional sticking are outweighed by the benefits it provides.

For a classic car owner, investing in a quality part like the Gates SX-5690 ensures peace of mind, knowing that the fuel tank is properly sealed and the vehicle remains in optimal condition. It is a straightforward upgrade that balances performance, aesthetics, and longevity.

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**Buy the Gates SX-5690 fuel tank cap.** Purchase it from a trusted retailer (such as RockAuto, Summit Racing, or a local automotive parts store) to avoid counterfeit products. If you encounter any installation challenges, take the time to clean the fuel tank opening and surrounding area thoroughly. Regularly inspect the cap for signs of wear or sticking, and clean it as needed to prolong its service life.

For additional confidence, consider pairing this with a fuel system inspection (e.g., checking for leaks or corrosion in the fuel lines) to ensure the entire system is functioning correctly. This will help maintain the reliability and performance of your 1970 Pontiac Bonneville.

Details:

Gates Fuel Tank Cap for 1970 Pontiac Bonneville 6.6L 7.5L V8 Gas Delivery gz: Status: In Stock.

part #: sx5690 prices

• $15.51-$69.18

specifications fueltanksysteme:

• for models: Bonneville
• for makes: Pontiac
• for years: 1970
• brand: Gates
• mpn: Sx-5690
• type: Fuel Tank Cap
• placement on vehicle: Air Fuel Delivery Hardware Fasteners Fittings
• item height: 3.000
• item width: 3.630
• manufacturer warranty: Recommended Service Interval
• ipn: C425 54-32
• core charge: Free No Core Charge
• fitment type: Direct Replacement
• bundle description: 1 Pc Genuine Gates Fuel Tank Cap

returns fueltanksysteme:

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

offer fueltanksysteme:

• started: February 25, 2026
• sold: 0
• quantity: 10
• options: Ship-to-home
• availability: In Stock

general fueltanksysteme:

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

shipping fueltanksysteme:

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

payments fueltanksysteme:

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

seller fueltanksysteme:

• rating: 99.5%
• # reviews: 625758
• city: Indianapolis, Indiana

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