GATES SX-3363 Fuel Tank Cap Supreme 4.3L 5.7L V6 V8

( Brand: Gates ), ( Manufacturer Part Number: SX-3363 ), ( 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: C719 58-42 ), ( Compatible Model: Cutlass Supreme ), ( Compatible Year: 1985 1984 1983 1982 1981 1980 1979 ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement ), ( Bundle Description: 1 Pc Genuine Gates Fuel Tank Cap )

Review GATES Fuel Tank Cap Oldsmobile Supreme 4.3l 5.7l V6 V8 fits CUTLASS 1979–1985

The **Gates SX-3363 Fuel Tank Cap** is a meticulously engineered, high-performance replacement part designed specifically for the iconic **1979 1985 Oldsmobile Cutlass Supreme** with either the **4.3L V6 or the 5.7L V8 engine**, ensuring a perfect fit and seamless integration into your vehicle s fuel system. Crafted from durable, corrosion-resistant materials, this cap is built to withstand the rigors of daily driving while maintaining a tight, secure seal to prevent fuel vapors from escaping, thus enhancing both performance and fuel efficiency. The **SX-3363** features Gates signature **dual-lip sealing system**, which provides an airtight barrier against moisture, dirt, and debris, protecting your fuel system from contamination and ensuring optimal engine operation. Unlike generic aftermarket alternatives, this cap is engineered to match the exact specifications of the original equipment manufacturer (OEM), including the precise thread pitch and venting design, which is critical for maintaining proper fuel pressure and preventing vapor lock especially in high-performance or heavily modified applications. Its **smooth, low-friction venting mechanism** allows for efficient pressure equalization while minimizing resistance, reducing the risk of fuel starvation during aggressive driving or steep inclines. Additionally, the cap s **durable plastic construction** is resistant to UV degradation, ensuring longevity even when exposed to prolonged sunlight, while its **ergonomic grip** makes it easy to install and remove without tools. Whether you re restoring a classic Cutlass Supreme to its original glory or upgrading an existing vehicle for better reliability, the **Gates SX-3363** is the premium choice combining precision engineering, durability, and performance to keep your engine running at its best.

Buying a replacement fuel tank cap for a 1979 1985 Oldsmobile Cutlass Supreme with a 4.3L, 5.7L V6, or V8 engine specifically the Gates SX-3363 has both advantages and drawbacks. Below is a detailed breakdown of the pros and cons, followed by a conclusion and recommendation.

---

### **Pros of buying a Gates SX-3363 Fuel Tank Cap**

1. **OEM Fitment and Compatibility**

The Gates SX-3363 is designed as an exact replacement for the original equipment manufacturer (OEM) fuel tank cap on these Cutlass Supreme models. This ensures a proper seal, preventing fuel vapors from escaping and maintaining the vehicle s emissions system integrity. Aftermarket caps that don t match the OEM specifications may not fit correctly, leading to leaks or improper sealing.

2. **Durability and Quality**

Gates is a well-known manufacturer of automotive parts, particularly for fuel system components. Their caps are typically made from durable materials like polypropylene or ABS, which resist corrosion, cracking, and warping over time. The SX-3363 is built to withstand the pressures and temperatures inside a fuel tank, reducing the risk of failure.

3. **Emissions Compliance**

Older vehicles like the Cutlass Supreme were subject to emissions regulations that required a properly sealed fuel tank cap to pass inspections (e.g., smog checks in some states). A non-OEM cap that doesn t meet these specifications could cause the vehicle to fail emissions testing, leading to unnecessary expenses for repairs or replacements.

4. **Easy Installation**

The Gates SX-3363 is straightforward to install, requiring no special tools beyond a basic socket set or wrench. The design is compatible with the original mounting points, and the threaded connection ensures a secure fit without modifications to the fuel tank or filler neck.

5. **Availability and Reliability**

Gates parts are widely available through automotive supply chains, including online retailers (e.g., RockAuto, Amazon, eBay), local auto parts stores, and dealerships. This makes it easier to purchase without long wait times or shipping delays. Additionally, Gates offers a reputation for reliability, reducing the likelihood of needing to replace the cap prematurely.

6. **Compatibility with Aftermarket Fuel Systems**

If you ve modified your vehicle s fuel system (e.g., upgraded fuel lines, added a fuel pump, or installed an aftermarket fuel gauge), the Gates SX-3363 will still function correctly as long as the filler neck and tank connections are compatible. It won t interfere with these modifications.

7. **Cost-Effective Solution**

While the price of the Gates SX-3363 may be slightly higher than some generic aftermarket alternatives, it represents a cost-effective solution in the long run. Cheaper caps may fail sooner, leading to repeated replacements and potential fuel leaks or emissions issues.

---

### **Cons of buying a Gates SX-3363 Fuel Tank Cap**

1. **Price Compared to Generic Alternatives**

The Gates SX-3363 is more expensive than some no-name or generic fuel tank caps available on the market. For example, you might find caps priced at $5 $10 from unknown brands, while Gates typically ranges from $15 $25. This higher cost may be a deterrent for budget-conscious buyers, especially if the cap is only needed for emissions compliance rather than performance or reliability.

2. **Potential for Overkill**

If the original cap on your Cutlass Supreme was already functioning correctly (no leaks, proper sealing, and passing emissions), replacing it with a Gates part may be unnecessary. Unless the original cap is damaged or worn, there s no performance benefit to upgrading, making the purchase redundant.

3. **Limited Customization**

The Gates SX-3363 is a standard replacement part with no customizable features (e.g., color, material, or additional functions like a built-in fuel gauge). If you re looking for aesthetic upgrades or specialized features, this cap won t offer those options.

4. **Risk of Counterfeit or Misrepresented Parts**

While Gates is a reputable brand, purchasing from untrusted sellers (e.g., unknown online marketplaces or discount stores) could result in receiving a counterfeit or inferior-quality part. Always buy from authorized dealers, Amazon, or well-reviewed suppliers to avoid this risk.

5. **Potential for Over-Tightening**

Some users may accidentally overtighten the cap during installation, stripping the threads on the fuel tank filler neck. While this is rare with the Gates SX-3363 (due to its sturdy design), it s a possibility if the user lacks experience with fuel system components. Over-tightening can damage the filler neck, requiring additional repairs.

6. **Environmental Concerns (Minor)**

The Gates SX-3363, like most plastic fuel caps, is not biodegradable. If you re environmentally conscious and prefer recyclable or eco-friendly parts, this may be a minor drawback. However, the environmental impact is negligible compared to the cap s functional benefits.

---

### **Conclusion**

The Gates SX-3363 fuel tank cap is an excellent choice for owners of a 1979 1985 Oldsmobile Cutlass Supreme with a 4.3L, 5.7L V6, or V8 engine. Its primary advantages OEM fitment, durability, emissions compliance, and ease of installation outweigh the minor drawbacks, such as its higher price and lack of customization. The cap ensures that your vehicle meets emissions standards, prevents fuel vapors from escaping, and avoids potential leaks that could damage the fuel system or environment.

If your original cap is damaged, leaking, or causing emissions issues, the Gates SX-3363 is the most reliable and long-term solution. However, if the original cap is still functional and you re on a tight budget, a generic aftermarket cap *might* suffice for basic operation, though it could risk emissions failures or leaks down the line.

---

### **Recommendation**

- Your original cap is damaged, cracked, or leaking.

- Your vehicle is failing emissions tests due to a faulty cap.

- You want a durable, long-lasting replacement that meets OEM specifications.

- You prefer a trusted brand over cheaper, untested alternatives.

- Your original cap is still in good condition and functioning correctly.

- You re on a very tight budget and can accept the risk of using a generic cap (though this is not recommended for emissions compliance).

- You re purchasing from an untrusted seller and risk receiving a counterfeit part.

**Final Verdict:** For the reliability, emissions compliance, and peace of mind it provides, the Gates SX-3363 is the best choice for this application. It s a small but critical part that, when functioning properly, ensures your Cutlass Supreme runs smoothly and legally.

Details:

Gates Fuel Tank Cap for 1979 1985 Oldsmobile Cutlass Supreme 4.3L 5.7L V6 V8 nn: Status: In Stock.

part #: sx3363 prices

• $24.40-$24.90

specifications fueltanksysteme:

• for models: Cutlass
• for makes: Oldsmobile
• for years: 1979-1985
• brand: Gates
• mpn: Sx-3363
• 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: C719 58-42
• compatible model: Cutlass Supreme
• compatible year: 1985 1984 1983 1982 1981 1980 1979
• core charge: Free No Core Charge
• fitment type: Direct Replacement
• bundle description: 1 Pc Genuine Gates Fuel Tank Cap

general fueltanksysteme:

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

payments fueltanksysteme:

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

offer fueltanksysteme:

• options: Ship-to-home
• sold: 0
• availability: In Stock
• quantity: 4
• started: May 12, 2026

returns fueltanksysteme:

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

shipping fueltanksysteme:

• transit: 2-6 Days
• class: Standard, Expedited
• cost: $0.00
• service: Standard, Expedited
• type: Fixed

seller fueltanksysteme:

• rating: 99.6%
• # reviews: 656213
• city: Indianapolis, Indiana

Gates SX-3363 Is Similar To:

• 10823 Stant Fuel Tank Cap Carquest Gates Cl 00333420082364 (34.5% similar) ...(March 25th, 2018)
• 23924 Gates Corporation Fuel Fill Hose (27.2% similar) Suitable for use with gasoline, gasohol blends of ethanol, methanol, ether's. 5 weight lbs. Suitable for diesel and bio diesel to B20. Cuts easily with knife and wire cutters. Also works well on auxiliary fuel tanks recreational vehicles. Note: use Gates super hex clamps for reliable installation ...(May 27th, 2018)
• 23930 Gates Fuel Filler Hose (29.6% similar) ...(November 4th, 2017)
• 23936 Gates Corporation Fuel Fill Hose (27.2% similar) Note: use Gates super hex clamps for reliable installation. Cuts easily with knife and wire cutters. 25 weight lbs. Suitable for use with gasoline, gasohol blends of ethanol, methanol, ether's. Packaging 5 per carton standard pack 8 product attributes type fuel fill hose specifications center line ...(April 25th, 2018)
• 23940 Gates Fuel Filler Hose (29.6% similar) If your looking to increase gas mileage, get better engine performance, or help the environment 123AUTOPARTS on motors is place buy now...(January 24th, 2019)
• 23964 Gates Fuel Filler Hose (29.6% similar) ...(June 30th, 2018)
• 23968 Gates Fuel Filler Hose (29.6% similar) Get in, sit down, hold on, shut up and enjoy the ride...(March 10th, 2018)
• 23972 Gates Fuel Filler Hose (29.6% similar) Thanks again for trusting DI-auto to get you the right part as quickly possible...(October 15th, 2018)
• 24702 Gates Fuel Filler Hose (29.6% similar) ...(April 3rd, 2018)
• 24703 Gates Fuel Filler Hose (29.6% similar) Small manufacture updates to finish or fit may occur on some parts without stock photo. The return address support most times is incorrect. The photos provide a product presentation of part being sold...(May 5th, 2018)
• 24711 Gates Fuel Hose Degree 72053981315 (33.1% similar) One per package fuel fill hose - angled. Gates fuel fill hose - angled x deg...(September 18th, 2018)