GATES SX-4550 Fuel Tank Gas Cap Fargo Qz 3.7L 5.2L 6.3L V8

( Brand: Gates ), ( Manufacturer Part Number: SX-4550 ), ( 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: C770 35-25 ), ( Compatible Make: Fargo ), ( Compatible Model: D110 Pickup ), ( Compatible Year: 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 Fargo Pickup 3.7l 5.2l 6.3l L6 V8 Gas Qz fits D110 1966–1970

The **Gates SX-4550 Fuel Tank Cap** is a meticulously engineered, high-performance replacement part designed specifically for the classic **1966 1970 Fargo D110** pickup trucks equipped with the legendary **3.7L, 5.2L, or 6.3L inline-six (I6) or 5.2L/6.3L V8 gas engines**, including those with the **QJ or QZ code blocks**. Crafted from durable, corrosion-resistant materials, this fuel cap is built to withstand the demands of rugged off-road use while maintaining a sleek, factory-inspired appearance. The cap features a **secure, dual-lip gasket system** that ensures an airtight seal, preventing fuel vapors from escaping and reducing the risk of evaporation or contamination, which is especially critical for maintaining optimal engine performance in high-mileage or restored vehicles. Its **precision-machined threads** guarantee a smooth, leak-free fit, eliminating the frustration of stubborn or ill-fitting aftermarket alternatives. The cap s **chrome-plated finish** not only enhances its aesthetic appeal, complementing the aggressive, utilitarian look of the D110 s original design, but also provides added resistance to rust and wear over time. Whether you re restoring a show-quality Fargo or simply ensuring reliable operation for daily driving, the Gates SX-4550 delivers the perfect blend of functionality and heritage authenticity. Built to meet or exceed OEM standards, this cap is a must-have upgrade for any enthusiast seeking to preserve the integrity and performance of their classic Ford truck.

### **Pros and Cons of Buying a Gates SX-4550 Fuel Tank Cap for a 1966 1970 Fargo D110 (3.7L, 5.2L, 6.3L L6 V8 Gas, QZ)**

1. **OEM Replacement Fit** The Gates SX-4550 is designed as a direct replacement for the original fuel tank cap on your Fargo D110, ensuring proper alignment and functionality without modifications.

2. **Durable Construction** Gates is a well-known brand for automotive parts, offering a sturdy plastic or metal cap with a reliable sealing mechanism to prevent fuel vapors from escaping.

3. **Pressure Relief Valve** The cap includes a pressure relief valve, which helps maintain proper fuel tank pressure, reducing the risk of vapor lock or fuel system issues.

4. **Easy Installation** The design is straightforward, requiring no special tools or expertise to install, making it a convenient upgrade or replacement.

5. **Compatibility with Multiple Engines** Since it fits the 3.7L, 5.2L, and 6.3L L6 V8 engines in your Fargo model range, it provides flexibility if you ever switch parts or upgrade components.

6. **Prevents Fuel Loss** A properly sealed cap ensures fuel remains contained, reducing evaporation and potential fuel system inefficiencies.

7. **Available New or Aftermarket** You can purchase this part new from reputable suppliers, ensuring quality and avoiding potential issues with counterfeit or damaged used parts.

1. **Potential Styling Mismatch** While functional, the Gates cap may not match the exact appearance of the original factory cap, which could be a concern if aesthetics are important to you.

2. **Price Consideration** As an aftermarket part, it may be slightly more expensive than a generic or no-name replacement, though the quality justifies the cost.

3. **Limited Customization** Unlike some aftermarket caps, this is a standard replacement and does not offer additional features like LED indicators or custom colors.

4. **Availability Issues** Depending on the supplier, stock levels may vary, and you might need to order online if local auto parts stores do not carry it.

5. **No Warranty on Used Parts (If Applicable)** If purchasing from a third-party seller, ensure the part is new and comes with a warranty to avoid potential defects.

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### **Conclusion and Recommendation**

The **Gates SX-4550 fuel tank cap** is an excellent choice for your 1966 1970 Fargo D110, particularly if you prioritize **reliability, proper sealing, and OEM compatibility**. Its durable construction and pressure relief valve make it a practical upgrade over a generic or worn-out cap. While it may not offer aesthetic customization, its functional benefits such as preventing fuel loss and maintaining system efficiency outweigh minor drawbacks like potential styling differences.

Purchase the **Gates SX-4550 from a trusted supplier** (such as RockAuto, Summit Racing, or a local auto parts store with a return policy) to ensure you receive a new, high-quality part. If you notice any leaks or performance issues with your current cap, replacing it with this Gates model will likely resolve those problems. For best results, pair this with a thorough inspection of your fuel tank and lines to ensure no other underlying issues exist.

Details:

Gates Fuel Tank Cap for 1966-1970 Fargo D110 Pickup 3.7L 5.2L 6.3L L6 V8 Gas qz: Status: In Stock.

part #: sx4550 prices

• $32.51-$41.40

specifications fueltanksysteme:

• for years: 1966-1970
• brand: Gates
• mpn: Sx-4550
• 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: C770 35-25
• compatible make: Fargo
• compatible model: D110 Pickup
• compatible year: 1970 1969 1968 1967 1966
• core charge: Free No Core Charge
• fitment type: Direct Replacement
• bundle description: 1 Pc Genuine Gates Fuel Tank Cap

returns fueltanksysteme:

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

shipping fueltanksysteme:

• type: Fixed
• service: Standard, Expedited
• transit: 4-6 Days
• class: Standard, Expedited
• cost: $0.00

seller fueltanksysteme:

• rating: 99.6%
• # reviews: 660739
• city: Indianapolis, Indiana

offer fueltanksysteme:

• started: May 24, 2026
• availability: In Stock
• options: Ship-to-home
• sold: 0
• quantity: 10

general fueltanksysteme:

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

payments fueltanksysteme:

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

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