GATES SX-5791 Fuel Tank Gas Cap Gn 4.1L 4.8L 5.7L L6 V8
fits model: C35. make: Chevrolet. year: 1983–1997.
( Brand: Gates ), ( Manufacturer Part Number: SX-5791 ), ( 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: C399 39-55 ), ( Compatible Year: 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement ), ( Bundle Description: 1 Pc Genuine Gates Fuel Tank Cap )
Review GATES Fuel Tank Cap Chevrolet 4.1l 4.8l 5.7l L6 V8 Gas Gn fits C35 1983–1997
The **Gates SX-5791 Fuel Tank Cap** is a high-performance, precision-engineered replacement part designed specifically for the iconic 1983 through 1997 Chevrolet C35 pickup trucks, including models equipped with the legendary **4.1L, 4.8L, 5.7L inline-six (I6), and V8 gasoline engines**. Crafted from durable, corrosion-resistant materials, this fuel cap is built to meet or exceed OEM standards while delivering superior functionality and longevity. The cap features a robust, threaded design that ensures a tight, leak-proof seal, preventing fuel vapors from escaping and maintaining optimal pressure within the fuel system. Its ergonomic grip and smooth-operating mechanism make it easy to open and close, even in tight or awkward positions under the hood, while its sturdy construction resists warping, cracking, or deterioration from exposure to harsh weather conditions, UV rays, or fuel residue. Beyond its practical benefits, the Gates SX-5791 is also an aesthetic upgrade, offering a sleek, polished finish that complements the classic look of the C35 lineup. Whether you're restoring a vintage truck, upgrading a daily driver, or ensuring a reliable fit for a performance build, this fuel tank cap combines durability, performance, and style to keep your Chevrolet running smoothly for years to come.
### Pros and Cons of buying a Gates SX-5791 Fuel Tank Cap for a 1983 1997 Chevrolet C35 (4.1L, 4.8L, 5.7L L6/V8 Gas/GN)
#### **Pros:**1. **OEM Fitment and Compatibility** The Gates SX-5791 is designed specifically for the 1983 1997 Chevrolet C35 series, including the 4.1L, 4.8L, 5.7L inline-six (L6), and V8 engines (both gasoline and gas-natural, GN). This ensures a proper seal and secure fit without modifications.
2. **High-Quality Material** Gates is a reputable brand known for durable, corrosion-resistant materials. The cap is likely made from metal or reinforced plastic, which helps prevent leaks and deterioration over time.
3. **Easy Installation** As an OEM replacement, the cap should install straightforwardly without requiring additional tools or modifications. The threads and mounting mechanism align with the original design.
4. **Reliability** Gates products are generally built to last, reducing the risk of premature failure compared to cheaper, aftermarket alternatives.
5. **Prevents Fuel Evaporation and Contamination** A properly sealed fuel cap maintains fuel integrity, reducing vapor loss and preventing dirt or moisture from entering the fuel system.
6. **Compatibility with Fuel Systems** The cap is designed to work with the vehicle s fuel pressure and venting system, ensuring proper fuel delivery and emissions compliance.
7. **Widely Available** As an OEM or aftermarket part, it can be found at auto parts stores, online retailers, or through Gates distributors, making it easy to source.
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#### **Cons:**1. **Potential Overkill for Minor Use** If the original cap was functional but slightly worn, replacing it with a new Gates cap may be unnecessary unless there are signs of leaks, cracks, or improper sealing.
2. **Cost Compared to Generic Alternatives** While Gates is a premium brand, generic or budget fuel caps from other manufacturers may be significantly cheaper. If the original cap is still serviceable, this could be a downside.
3. **No Additional Features** Unlike some aftermarket caps, the Gates SX-5791 does not include extra features such as a built-in fuel level indicator, pressure regulator, or specialized sealing technology. It is a straightforward replacement.
4. **Possible Misalignment Risk** If the fuel tank or cap mounting area is damaged (e.g., bent threads or warped surface), the new cap may not seal properly, leading to leaks. Inspection of the tank area is recommended before installation.
5. **Limited Customization** The cap is not designed for performance tuning or modifications; it is purely a functional replacement part.
6. **Potential for Counterfeit Parts** When purchasing online, there is a risk of receiving a counterfeit Gates part that does not meet quality standards. Buying from authorized dealers or reputable sellers mitigates this risk.
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### **Conclusion:**The Gates SX-5791 fuel tank cap is a **high-quality, reliable OEM replacement** for the specified Chevrolet C35 models. It offers a secure seal, durability, and compatibility with the vehicle s fuel system, making it an excellent choice if the original cap is damaged, leaking, or missing. However, if the current cap is still functional and the vehicle is not experiencing fuel-related issues, replacing it may not be immediately necessary.
For most owners experiencing leaks, corrosion, or a faulty seal, the Gates cap is a **strong recommendation** due to its reputation for quality and longevity. If budget is a concern, a thorough inspection of the existing cap may reveal that a simpler or cheaper replacement is sufficient.
**Final Recommendation:** Purchase the Gates SX-5791 if:- The original cap is cracked, leaking, or missing.
- You want a durable, long-lasting replacement with OEM fitment.
- You prioritize reliability over cost savings.
Avoid replacing it if:- The current cap is still functional and there are no signs of failure.
- You are open to testing a lower-cost alternative first.
Details:
Gates Fuel Tank Cap for 1983 - 1997 Chevrolet C35 4.1L 4.8L 5.7L L6 V8 Gas gn: Status: In Stock.
part #: sx5791 prices
- $8.04-$33.09
specifications fueltanksysteme:
- for models: C35
- for makes: Chevrolet
- for years: 1983-1997
- brand: Gates
- mpn: Sx-5791
- 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: C399 39-55
- compatible year: 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985
- core charge: Free No Core Charge
- fitment type: Direct Replacement
- bundle description: 1 Pc Genuine Gates Fuel Tank Cap
payments fueltanksysteme:
- wallet: Paypal
- other
- credit card: Diners-club
returns fueltanksysteme:
- time: 30 Days
- policy: Returns Accepted
- paid by: Seller
offer fueltanksysteme:
- sold: 0
- options: Ship-to-home
- quantity: 10
- availability: In Stock
- started: May 26, 2026
general fueltanksysteme:
- Car Truck Parts Accessories > Air Fuel Delivery > Fuel Tanks Filler Necks
- condition: New
seller fueltanksysteme:
- city: Indianapolis, Indiana
- # reviews: 661282
- rating: 99.6%
shipping fueltanksysteme:
- service: Standard, Expedited
- transit: 2-6 Days
- class: Standard, Expedited
- type: Fixed
- cost: $0.00
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