MOTORAD SX-Z5YZ Fuel Tank Cap Gk 4.3L 4.8L 5.0L 5.7L 6.2L 7.4L

( Brand: Motorad ), ( Manufacturer Part Number: SX-Z5YZ ), ( Type: Fuel Tank Cap ), ( Placement On Vehicle: Air Fuel Delivery Hardware Fasteners Fittings ), ( Item Width: 3.500 ), ( Item Length: 5.250 ), ( Manufacturer Warranty: 1 Year ), ( Ipn: C383 78-22 ), ( Compatible Year: 1989 1988 1987 ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement ), ( Bundle Description: 1 Pc Genuine Motorad Fuel Tank Cap )

Review MOTORAD Fuel Tank Cap Gmc 4.3l 4.8l 5.0l 5.7l 6.2l 7.4l Gk fits R2500 1987–1989

The **Motorad SX-Z5YZ Fuel Tank Cap** is a meticulously crafted, high-performance replacement for the original fuel cap found on 1987 through 1989 GMC R2500 trucks equipped with a range of legendary **GM Vortec** and **Oldsmobile** V8 engines, including the **4.3L (V6), 4.8L (V6), 5.0L (V8), 5.7L (V8), 6.2L (V8), and the massive 7.4L (L36/L74) big-block powerplants** found in the iconic **GK series** trucks. Engineered to meet or exceed OEM specifications, this fuel cap is designed not only for functionality but also for a refined, aggressive aesthetic that complements the rugged yet sophisticated nature of these classic workhorses.

Constructed from **durable, corrosion-resistant metal**, the SX-Z5YZ fuel cap features a **precision-machined design** that ensures a perfect fit, eliminating leaks and preventing fuel vapors from escaping while maintaining proper pressure within the fuel system. The cap is equipped with a **high-quality rubber gasket**, which remains flexible and resilient over time, providing a tight seal that protects against moisture, dirt, and debris critical for maintaining fuel integrity in demanding environments. Unlike generic aftermarket alternatives, this cap is **reverse-engineered to match the exact dimensions and threading** of the original GMC component, ensuring compatibility without the need for modifications.

Beyond its functional superiority, the Motorad SX-Z5YZ fuel cap also delivers a **bold, custom look** that elevates the truck s appearance. The cap is finished in a **bold, matte black or polished chrome** (depending on the variant), offering a sleek contrast against the truck s bodywork while reinforcing its performance-oriented stance. For enthusiasts who prefer a more subtle yet premium finish, the **brushed aluminum** option provides a sophisticated, understated elegance that still exudes quality. The cap s **ergonomic handle** is designed for easy installation and removal, even in tight spaces, while its **weight distribution** ensures it stays securely in place during transit, reducing the risk of accidental dislodging.

Whether you re restoring a **GMC R2500** to its original glory or customizing it for modern performance, the Motorad SX-Z5YZ fuel cap is a **must-have upgrade** that combines **durability, precision engineering, and stylish panache**. Built to withstand the rigors of daily use whether hauling heavy loads, towing trailers, or simply cruising down the highway the cap ensures that your truck s fuel system remains **sealed, efficient, and reliable** for years to come. With its **universal fit** across the specified engine displacements and its **superior build quality**, this isn t just a replacement part it s an **essential component** for any serious GMC R2500 owner who demands both performance and precision.

**Pros and Cons of buying a Motorad SX-Z5YZ Fuel Tank Cap for a 1987-1989 GMC R2500 (4.3L 7.4L, GK Series)**

1. **OEM Fitment and Compatibility** The Motorad SX-Z5YZ is designed as a direct replacement for the original fuel tank cap on the 1987 1989 GMC R2500 with the GK chassis and various engine sizes (4.3L 7.4L). This ensures proper alignment, sealing, and functionality without modifications.

2. **Durable Construction** Motorad products are known for using high-quality materials, including sturdy plastic and reliable internal mechanisms. The cap is built to withstand regular use, reducing the risk of leaks or malfunctions over time.

3. **Easy Installation** Since it is a direct replacement, installation is straightforward, typically requiring only basic tools. No cutting, welding, or extensive modifications are needed, making it a hassle-free upgrade.

4. **Reliable Fuel Vapor System** The cap includes a fuel vapor valve, which helps regulate pressure in the fuel tank, preventing vapor lock and ensuring proper fuel delivery to the engine. This is particularly useful in older vehicles where the original cap may wear out.

5. **Cost-Effective Solution** Compared to rebuilding or replacing the entire fuel system, purchasing a new cap is a low-cost fix that extends the life of the original tank and prevents potential fuel leaks or vapor issues.

6. **Prevents Fuel Evaporation** A properly sealed cap reduces fuel evaporation, which is beneficial for both performance and fuel efficiency, especially in hot climates or during long storage periods.

7. **Compatibility with Aftermarket Mods** If you plan to modify your vehicle (e.g., adding a fuel pump, performance fuel injectors, or a larger fuel tank), a reliable cap ensures the system remains functional without compromising performance.

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1. **Limited Availability and Lead Times** Motorad parts, while high-quality, may not be as widely stocked as generic aftermarket brands. Depending on the retailer, you might face longer wait times for delivery, especially if ordering online.

2. **Price Point** While still affordable compared to full fuel system replacements, the Motorad cap is slightly more expensive than some generic or no-name alternatives. For budget-conscious buyers, this could be a minor drawback.

3. **Potential for Counterfeit Products** If purchasing from an unverified seller (e.g., third-party online marketplaces), there is a risk of receiving a counterfeit or low-quality knockoff. Always buy from authorized dealers or reputable retailers to avoid this issue.

4. **No Performance Upgrades** This cap is a functional replacement, not a performance-enhancing part. If you re looking for a high-flow cap for increased fuel delivery (common in performance builds), this may not be the best choice though it will still work reliably for daily driving.

5. **Minimal Aesthetic Customization** Unlike some aftermarket caps designed for a sportier look, the Motorad SX-Z5YZ is a utilitarian part. If appearance is a priority, you may need to pair it with a decorative cover or choose a different brand.

6. **Wear Over Time** While durable, no fuel cap lasts indefinitely. The internal seals and spring mechanism can degrade with age, especially if the vehicle is driven frequently in harsh conditions (e.g., extreme heat, cold, or off-road use). Regular inspection is recommended.

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### **Conclusion and Recommendation**

The **Motorad SX-Z5YZ fuel tank cap** is an excellent choice for owners of a 1987 1989 GMC R2500 with the GK chassis and engines ranging from 4.3L to 7.4L. Its **OEM fitment, durability, and reliability** make it a practical and low-risk upgrade, particularly if you re experiencing issues with the original cap (e.g., leaks, difficulty opening/closing, or vapor lock). The cap addresses common problems without requiring extensive modifications, making it ideal for both daily drivers and occasional use vehicles.

- **Buy it if:** You need a direct replacement for a failing original cap, prioritize durability, and want a hassle-free installation. It s especially useful if you ve noticed fuel odor, leaks, or difficulty in opening the cap.

- **Consider alternatives if:** You re on a tight budget and can find a high-quality generic cap (ensure it matches the thread size and vapor valve design), or if you re looking for a performance-oriented cap (though this one will still function well for stock or mild builds).

- **Purchase from:** Authorized Motorad dealers, reputable online marketplaces (e.g., RockAuto, Summit Racing), or trusted local auto parts stores to avoid counterfeit products.

**Final Verdict:** The Motorad SX-Z5YZ is a **strong, reliable, and cost-effective solution** for maintaining or restoring proper fuel system function in your 1987 1989 GMC R2500. It s a part worth investing in to prevent larger issues down the road.

Details:

part #: sxz5yz prices

• $18.82-$23.40

specifications fueltanksysteme:

• for models: R2500
• for makes: Gmc
• for years: 1987-1989
• brand: Motorad
• mpn: Sx-z5yz
• type: Fuel Tank Cap
• placement on vehicle: Air Fuel Delivery Hardware Fasteners Fittings
• item width: 3.500
• item length: 5.250
• manufacturer warranty: 1 Year
• ipn: C383 78-22
• compatible year: 1989 1988 1987
• core charge: Free No Core Charge
• fitment type: Direct Replacement
• bundle description: 1 Pc Genuine Motorad Fuel Tank Cap

shipping fueltanksysteme:

• type: Fixed
• transit: 3-6 Days
• service: Standard, Expedited
• class: Standard, Expedited
• cost: $0.00

seller fueltanksysteme:

• rating: 99.5%
• city: Indianapolis, Indiana
• # reviews: 627651

payments fueltanksysteme:

• wallet: Paypal
• credit card: Mastercard
• other

general fueltanksysteme:

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

offer fueltanksysteme:

• sold: 0
• availability: In Stock
• options: Ship-to-home
• quantity: 10
• started: March 1, 2026

returns fueltanksysteme:

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

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