GATES SX-3336 Fuel Tank Gas Cap Riviera 7.0L 7.5L V8

( Brand: Gates ), ( Manufacturer Part Number: SX-3336 ), ( 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: C184 34-66 ), ( Compatible Model: Riviera ), ( Compatible Year: 1974 1973 1972 1971 1970 1969 1968 1967 1966 ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement ), ( Bundle Description: 1 Pc Genuine Gates Fuel Tank Cap )

Review GATES Fuel Tank Cap Buick Riviera 7.0l 7.5l V8 Gas Delivery fits HX 1966–1974

The **Gates SX-3336 Fuel Tank Cap** is a meticulously engineered, high-performance replacement part designed specifically for the iconic 1966 through 1974 Buick Riviera models equipped with the legendary **7.0L (425 ci) and 7.5L (455 ci) V8 gas-powered engines**, including the high-output **HX** variants. Crafted from durable, corrosion-resistant materials, this fuel tank cap is built to withstand the demands of aggressive driving, high-performance applications, and the harshest environmental conditions, ensuring a secure and reliable seal every time. The cap features a **precision-machined, heavy-duty metal body** with a robust internal spring mechanism, providing an airtight closure that prevents fuel vapors from escaping while maintaining optimal pressure within the fuel system. Its **smooth, ergonomic grip** allows for easy installation and removal, even in tight spaces under the hood, while the **chrome-plated finish** not only enhances its aesthetic appeal but also protects against rust and wear over time. Engineered to meet or exceed OEM specifications, this Gates cap is a direct-fit replacement, ensuring compatibility with the Riviera s fuel system without the need for modifications. Whether you're restoring a classic Riviera to its original glory or upgrading a high-performance build, the SX-3336 is the ideal choice for maintaining fuel integrity, preventing leaks, and preserving the engine s efficiency all while delivering the confidence of a premium, long-lasting solution.

### Pros and Cons of buying a Gates SX-3336 Fuel Tank Cap for a 1966 1974 Buick Riviera (7.0L/7.5L V8 Gas HX)

1. **OEM Fitment and Compatibility** The Gates SX-3336 is designed as a direct replacement for the original fuel tank cap on your Buick Riviera, ensuring an exact fit without modifications. This reduces the risk of leaks or improper sealing, which can lead to fuel evaporation or contamination.

2. **High-Quality Materials** Gates is a reputable brand known for durable, corrosion-resistant components. The cap is likely made from sturdy plastic and metal, with a reliable sealing mechanism to prevent moisture and debris from entering the fuel system.

3. **Prevents Fuel Evaporation** A properly sealed fuel cap reduces fuel vapor loss, which is especially important for older vehicles prone to fuel line deterioration or carburetor issues. This can improve engine performance and fuel efficiency over time.

4. **Easy Installation** As a direct replacement, the cap should be straightforward to install, requiring no special tools beyond a basic wrench or socket set. This makes it a convenient DIY-friendly upgrade.

5. **Compatibility with Aftermarket Mods** If you ve modified your fuel system (e.g., upgraded fuel lines, added a fuel pressure regulator, or installed an electric fuel pump), a reliable cap ensures the system operates correctly without restrictions.

6. **Prevents Contamination** A faulty or missing cap allows moisture, dirt, and debris to enter the fuel tank, which can clog fuel lines, damage the carburetor, or even cause corrosion inside the tank. The Gates cap mitigates this risk.

7. **Maintenance of Resale Value** Keeping original or high-quality aftermarket parts (like this fuel cap) can help maintain the vehicle s authenticity and resale appeal, particularly if you plan to sell or restore the Riviera in the future.

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1. **Potential for Counterfeit or Low-Quality Replicas** While Gates is a trusted brand, purchasing from unverified sellers (e.g., third-party online marketplaces) could result in a knockoff that doesn t fit properly or fails prematurely. Always buy from authorized dealers or reputable automotive parts retailers.

2. **Limited Availability in Some Regions** Gates parts may not be as widely stocked as more common OEM or generic alternatives. You might need to order online or visit a specialty auto parts store, which could involve shipping delays.

3. **Price Compared to Generic Alternatives** The Gates SX-3336 may cost more than a generic fuel cap from a big-box store or discount retailer. For some buyers, the extra cost may not justify the brand-name premium, especially if the vehicle is not a high-priority restoration project.

4. **No Additional Features** Unlike some modern fuel caps (e.g., those with pressure relief valves or electronic sensors), this is a basic mechanical cap. If you re running a modified fuel system (e.g., with a fuel pressure regulator or electric pump), you may need to ensure compatibility with the rest of your setup.

5. **Potential for Wear Over Time** While Gates parts are durable, no component lasts forever. If the cap is exposed to extreme heat, UV degradation, or frequent handling, the sealing gasket or threads could wear out, requiring eventual replacement.

6. **Mismatch with Modern Fuel Systems (If Applicable)** If you ve upgraded to a fuel-injected system (unlikely on these Rivieras, as they were carbureted), ensure the cap s design doesn t interfere with fuel pressure or vapor recovery systems. However, for your 7.0L/7.5L V8, this is unlikely to be an issue.

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The Gates SX-3336 fuel tank cap is a **highly recommended choice** for your 1966 1974 Buick Riviera for several key reasons. Its OEM fitment, durability, and role in preventing fuel loss and contamination make it a practical and reliable upgrade. While it may cost more than generic alternatives, the long-term benefits such as improved fuel system integrity and reduced maintenance headaches often justify the investment.

If you prioritize **authenticity, performance, and longevity**, this is the best option. However, if budget is a major concern and you re confident in the quality of a generic cap, you could explore alternatives though you risk compromising fit or function. Always verify the seller s reputation to avoid counterfeit parts.

**Purchase the Gates SX-3336 fuel tank cap** from an authorized dealer or a trusted online retailer (e.g., RockAuto, Summit Racing, or a local Buick specialty shop). If possible, inspect the cap upon arrival to ensure it matches the original in size, threading, and sealing mechanism. Install it promptly to prevent any potential fuel system issues. For added peace of mind, consider pairing it with a fuel system inspection (e.g., checking for leaks, corrosion, or degraded fuel lines) during the same maintenance window. This will help ensure your Riviera s fuel system remains in optimal condition.

Details:

Gates Fuel Tank Cap for 1966-1974 Buick Riviera 7.0L 7.5L V8 Gas Delivery Hx: Status: In Stock.

part #: sx3336 prices

• $30.09-$37.73

specifications fueltanksysteme:

• for models: Hx
• for makes: Buick
• for years: 1966-1974
• brand: Gates
• mpn: Sx-3336
• 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: C184 34-66
• compatible model: Riviera
• compatible year: 1974 1973 1972 1971 1970 1969 1968 1967 1966
• core charge: Free No Core Charge
• fitment type: Direct Replacement
• bundle description: 1 Pc Genuine Gates Fuel Tank Cap

offer fueltanksysteme:

• quantity: 10
• availability: In Stock
• options: Ship-to-home
• started: April 13, 2026
• sold: 0

payments fueltanksysteme:

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

returns fueltanksysteme:

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

general fueltanksysteme:

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

seller fueltanksysteme:

• city: Indianapolis, Indiana
• # reviews: 644225
• rating: 99.6%

shipping fueltanksysteme:

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

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