GATES SX-3597 Fuel Tank Gas Cap Regis Cf St. 3.7L 5.2L 5.9L L6 V8

( Brand: Gates ), ( Manufacturer Part Number: SX-3597 ), ( 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: C395 85-46 ), ( Compatible Model: St. Regis ), ( Compatible Year: 1981 1980 ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement ), ( Bundle Description: 1 Pc Genuine Gates Fuel Tank Cap )

Review GATES Fuel Tank Cap Dodge St. Regis 3.7l 5.2l 5.9l L6 V8 Gas Cf fits ST 1980–1981

The **Gates SX-3597 Fuel Tank Cap** is a meticulously engineered, high-performance replacement part designed specifically for the 1980 1981 Dodge Regis models equipped with the legendary **3.7L, 5.2L, or 5.9L LA-series straight-six engines**, as well as the **5.9L RB-series V8** found in the **Regis CF (Custom Fuel Injection)** variant. Crafted from durable, corrosion-resistant materials, this fuel tank cap is built to withstand the rigors of daily driving while ensuring a secure, vapor-tight seal to prevent fuel evaporation and maintain optimal engine performance. The cap features a robust, threaded design that matches the original equipment manufacturer (OEM) specifications precisely, guaranteeing a snug fit on the fuel filler neck without the need for modification. Its sleek, matte black finish not only enhances the aesthetic appeal of your vehicle s fuel system but also resists chipping and fading over time, ensuring longevity even in harsh environmental conditions. The cap is equipped with a reliable spring-loaded mechanism that provides a firm, consistent seal, reducing the risk of fuel leaks or spills while driving. Additionally, the integrated venting system helps regulate internal pressure within the fuel tank, preventing dangerous buildup that could compromise safety or performance. Whether you re restoring a classic Regis to its original glory or maintaining a well-loved collector s vehicle, the Gates SX-3597 is the ideal choice for preserving both functionality and heritage. Built to meet or exceed OEM standards, this part is a testament to Gates commitment to quality, ensuring that your fuel system operates as efficiently and reliably as the day your Regis rolled off the assembly line.

### Pros and Cons of buying a Gates SX-3597 Fuel Tank Cap for a 1980-1981 Dodge Regis (3.7L, 5.2L, 5.9L L6/V8 Gas CF)

#### **Pros**

1. **OEM Fitment and Compatibility** The Gates SX-3597 is designed as an exact replacement for the original fuel tank cap on the specified Dodge Regis models, ensuring a proper seal and preventing fuel vapors from escaping. This helps maintain fuel efficiency and reduces emissions.

2. **Durable Construction** Gates is a well-known manufacturer of high-quality automotive parts, and this cap is made with materials that resist corrosion, cracking, and wear over time. The threaded design ensures a secure fit.

3. **Prevents Fuel Evaporation and Vapor Lock** A properly sealed fuel cap helps retain fuel vapor pressure, reducing the risk of vapor lock (where fuel boils in the engine due to heat) and ensuring smoother engine performance, especially in hot climates.

4. **Easy Installation** The cap is straightforward to install, requiring no special tools beyond a basic socket or wrench. It threads directly onto the fuel tank, just like the original.

5. **Cost-Effective Replacement** Compared to some aftermarket alternatives, the Gates cap is reasonably priced while still offering reliable performance. It avoids the potential issues of cheaper, non-OEM parts that may not seal properly.

6. **Compatibility with Modern Fuel Systems** Many modern vehicles require a properly sealed fuel cap to pass emissions tests. While the Regis is older, using a quality cap ensures compatibility with any aftermarket fuel systems or modifications.

7. **Reduces Fuel Odor** A leaking or improperly sealed cap can allow fuel fumes to escape, creating an unpleasant odor in the vehicle. This cap eliminates that issue.

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#### **Cons**

1. **Potential for Counterfeit or Low-Quality Copies** Gates is a reputable brand, but some sellers may offer counterfeit or inferior copies that don t meet the same standards. Always purchase from a trusted source (e.g., official Gates dealers, reputable auto parts stores, or verified online retailers).

2. **Stiff or Seized Threads** Over time, the threads on the fuel tank or the cap itself can become corroded or seized, making installation difficult. If the tank threads are damaged, the cap may not fit properly, requiring additional cleaning or lubrication.

3. **Limited Availability in Some Regions** Depending on where you live, this specific part may not be as widely stocked as more common OEM or aftermarket alternatives. You may need to order it online.

4. **No Additional Features** Unlike some modern fuel caps, this is a basic sealing cap without features like a pressure relief valve or electronic sensors (which are irrelevant for this older vehicle but may be present in newer models).

5. **Possible Overkill for Minor Use** If the original cap was only slightly damaged (e.g., a cracked plastic housing but intact threads), some drivers might opt for a cheaper replacement. However, a failing cap is better replaced entirely to avoid long-term issues.

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### **Conclusion and Recommendation**

The **Gates SX-3597 fuel tank cap** is an excellent choice for a **1980-1981 Dodge Regis** with a **3.7L, 5.2L, 5.9L L6/V8 gas engine**. Its **OEM fitment, durability, and reliability** make it a superior replacement over generic or low-quality alternatives. The cap ensures proper fuel system function, prevents emissions leaks, and avoids the headaches of a failing seal.

- Cracks or brittleness in the plastic housing.

- Difficulty turning or a loose fit.

- Fuel odor inside the vehicle.

- Check Engine Light (CEL) for EVAP system issues (common on older Chrysler/Dodge vehicles).

- **Purchase from a trusted source** (e.g., RockAuto, Summit Racing, or a local auto parts store with a good return policy) to avoid counterfeit products.

- **Inspect the fuel tank threads** before installation clean them with penetrating oil if they appear corroded.

- **Consider replacing the fuel line gasket** while you re working on the tank, as it often wears out around the same time.

If your current cap is only slightly damaged (e.g., a minor crack but still functional), you might delay replacement, but **proactively replacing it is a small, preventative maintenance step** that can save you from bigger problems later. For most owners, the Gates cap is the **best balance of quality, fitment, and cost** for this application.

Details:

This Gates Fuel Tank Cap fits your 1981 1980 Dodge St. Gates Fuel Tank Cap for 1980 - 1981 Dodge St. Regis 3.7L 5.2L 5.9L L6 V8 Gas cf: Status: In Stock.

part #: sx3597 prices

• $18.42-$36.22

specifications fueltanksysteme:

• for models: St
• for makes: Dodge
• for years: 1980-1981
• brand: Gates
• mpn: Sx-3597
• 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: C395 85-46
• compatible model: St. Regis
• compatible year: 1981 1980
• core charge: Free No Core Charge
• fitment type: Direct Replacement
• bundle description: 1 Pc Genuine Gates Fuel Tank Cap

payments fueltanksysteme:

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

general fueltanksysteme:

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

shipping fueltanksysteme:

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

returns fueltanksysteme:

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

seller fueltanksysteme:

• rating: 99.6%
• city: Indianapolis, Indiana
• # reviews: 660729

offer fueltanksysteme:

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

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