GATES SX-0798 Fuel Tank Gas Cap Firedome Iu 5.6L 5.9L 6.3L V8

( Brand: Gates ), ( Manufacturer Part Number: SX-0798 ), ( 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: C512 17-23 ), ( Compatible Model: Firedome ), ( Compatible Year: 1959 1958 1957 ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement ), ( Bundle Description: 1 Pc Genuine Gates Fuel Tank Cap )

Review GATES Fuel Tank Cap Desoto Firedome 5.6l 5.9l 6.3l V8 Gas Iu fits 1957–1959

The **Gates SX-0798 Fuel Tank Cap** is a meticulously crafted, high-performance replacement part designed specifically for the iconic 1957 through 1959 Chrysler Corporation Desoto Firedome models equipped with the legendary 5.6L, 5.9L, or 6.3L V8 gasoline engines. Engineered to meet the rigorous demands of classic American muscle, this fuel tank cap is built with premium materials and precision machining to ensure a perfect fit and reliable operation. The cap features a robust, durable construction with a sturdy metal body and a secure, tamper-resistant locking mechanism, preventing accidental dislodging during transit or rough handling. Its sleek, vintage-inspired design complements the aggressive styling of the Firedome, blending seamlessly with the vehicle s original aesthetic while delivering modern functionality. The cap is equipped with a high-quality rubber gasket that ensures an airtight seal, preventing fuel vapors from escaping and maintaining optimal fuel system performance. Whether you're preparing your Desoto for a weekend cruise, a restoration project, or a high-performance modification, this Gates fuel tank cap provides the confidence of a reliable, long-lasting solution. Built to withstand the test of time, it s an essential component for preserving the integrity and performance of your classic muscle car.

### Pros and Cons of buying a Gates SX-0798 Fuel Tank Cap for a 1957-1959 Desoto Firedome (5.6L, 5.9L, 6.3L V8 Gas IU)

1. **OEM Fitment and Compatibility** The Gates SX-0798 is specifically designed for the 1957-1959 Desoto Firedome models with the 5.6L, 5.9L, and 6.3L V8 engines. This ensures a proper seal and prevents fuel leaks, which is critical for maintaining engine performance and safety.

2. **High-Quality Materials** Gates is a well-known manufacturer of automotive parts, particularly for fuel system components. This cap is likely made from durable materials, such as metal and rubber, which resist corrosion and wear over time.

3. **Prevents Fuel Evaporation and Vapor Lock** A properly sealed fuel cap helps maintain fuel pressure in the tank, reducing fuel evaporation and preventing vapor lock, which can cause engine stalling or difficulty starting.

4. **Easy Installation** Since it is a direct replacement part, installation is straightforward, requiring only basic tools. No modifications to the fuel tank or surrounding components are typically needed.

5. **Cost-Effective Solution** Replacing a worn or damaged fuel cap is a relatively inexpensive fix compared to potential engine damage caused by fuel leaks or vapor lock.

6. **Compatibility with Modern Fuel Standards** Gates parts are often designed to meet or exceed modern fuel system standards, ensuring compatibility with today s fuel formulations without requiring additional modifications.

7. **Reduces Fuel Odor and Contamination** A secure seal prevents moisture and debris from entering the fuel tank, which can lead to water contamination or sediment buildup in the fuel system.

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1. **Potential for Counterfeit or Low-Quality Replacements** While Gates is a reputable brand, there is a risk of purchasing a counterfeit or aftermarket knockoff that does not meet the same quality standards. Always verify the authenticity of the part, preferably by purchasing from a trusted dealer or authorized seller.

2. **Limited Availability in Some Regions** Depending on where you purchase the part, the Gates SX-0798 may not be as widely available as generic or aftermarket alternatives. This could require ordering online or from a specialty parts supplier.

3. **Price May Be Higher Than Generic Alternatives** While Gates is a premium brand, the cost may be slightly higher than generic fuel caps from lesser-known manufacturers. However, the trade-off in quality and longevity often justifies the expense.

4. **Potential for Over-Tightening During Installation** If not installed correctly, the cap could be over-tightened, leading to damage to the tank s sealing surface or the cap s threads. This could require replacing both the cap and the tank s gasket or threads in the future.

5. **No Additional Features (Compared to High-End Options)** The Gates SX-0798 is a standard fuel cap and does not include advanced features like pressure relief valves or fuel vapor recovery systems that some modern or high-performance caps offer. For classic cars, this is usually sufficient, but enthusiasts may explore specialized options if they are upgrading other fuel system components.

6. **Possible Incompatibility with Fuel System Modifications** If the vehicle has undergone fuel system modifications (e.g., fuel injection, performance carburetors, or fuel line upgrades), the stock fuel cap may not be ideal. However, the Gates cap is still a solid choice for stock or lightly modified applications.

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The Gates SX-0798 fuel tank cap is an excellent choice for restoring or maintaining a 1957-1959 Desoto Firedome with a 5.6L, 5.9L, or 6.3L V8 engine. Its OEM fitment, durability, and reliability make it a practical and cost-effective solution for preventing fuel leaks, vapor lock, and contamination. While there are minor drawbacks such as potential counterfeit risks or limited availability, these issues can be mitigated by purchasing from a reputable source and ensuring proper installation.

For most classic car owners, the Gates cap provides a balance of quality, performance, and ease of use without unnecessary complexity. It is a straightforward upgrade that enhances the vehicle s functionality and longevity.

Purchase the Gates SX-0798 from an authorized dealer, reputable online retailer (such as RockAuto, eBay with verified sellers, or a classic car parts specialist), or a trusted local mechanic. Verify the part s authenticity by checking for proper packaging, branding, and seller reviews. Install the cap carefully, ensuring it is tightened securely but not over-tightened to avoid damaging the threads. If the vehicle has any fuel system modifications or signs of fuel system issues beyond a simple cap replacement, consider consulting a mechanic to address those concerns holistically.

For most stock or lightly modified Desoto Firedomes, the Gates SX-0798 is the recommended choice for a reliable and long-lasting fuel tank cap.

Details:

Gates Fuel Tank Cap for 1957-1959 DeSoto Firedome 5.6L 5.9L 6.3L V8 Gas iu: Status: In Stock.

part #: sx0798 prices

• $22.15-$74.78

specifications fueltanksysteme:

• for makes: Desoto
• for years: 1957-1959
• brand: Gates
• mpn: Sx-0798
• 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: C512 17-23
• compatible model: Firedome
• compatible year: 1959 1958 1957
• core charge: Free No Core Charge
• fitment type: Direct Replacement
• bundle description: 1 Pc Genuine Gates Fuel Tank Cap

shipping fueltanksysteme:

• cost: $0.00
• transit: 3-7 Days
• service: Standard, Expedited
• class: Standard, Expedited
• type: Fixed

offer fueltanksysteme:

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

payments fueltanksysteme:

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

returns fueltanksysteme:

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

seller fueltanksysteme:

• # reviews: 661034
• rating: 99.6%
• city: Indianapolis, Indiana

general fueltanksysteme:

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

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