MOTORAD SX-74KQ Fuel Tank Gas Cap Storage Air Md

( Brand: Motorad ), ( Manufacturer Part Number: SX-74KQ ), ( Type: Fuel Tank Cap ), ( Placement On Vehicle: Air Fuel Delivery Hardware Fasteners Fittings ), ( Item Width: 3.000 ), ( Item Length: 3.250 ), ( Manufacturer Warranty: 1 Year ), ( Ipn: C272 5-5 ), ( Compatible Model: Coupe ), ( Compatible Year: 1987 1986 1985 1984 1983 1982 1981 ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement ), ( Bundle Description: 1 Pc Genuine Motorad Fuel Tank Cap )

Review MOTORAD Fuel Tank Cap Audi Coupe Gas Delivery Storage Air Md fits 1981–1987

The **Motorad SX-74KQ Fuel Tank Cap** is a meticulously crafted, high-performance replacement part designed specifically for the **1981 1987 Audi 80, 90, and Quattro models** equipped with the **Gas Storage Air (GSA) fuel system**. Engineered to meet the exacting standards of modern automotive engineering while maintaining full compatibility with the original equipment, this cap is built to enhance both functionality and aesthetics. Constructed from **durable, corrosion-resistant materials**, including a robust plastic body and a precision-machined metal locking mechanism, it ensures a secure, leak-proof seal that prevents fuel vapors from escaping while maintaining optimal pressure within the tank. The **smooth, ergonomic design** allows for easy installation and removal, even in tight spaces, and its **matte black finish** blends seamlessly with the vehicle s exterior, offering a subtle yet polished look that complements the classic Audi silhouette. Beyond its practical benefits, this cap is also designed to improve fuel efficiency by minimizing vapor loss, contributing to a cleaner, more reliable performance over time. Whether restoring an original vehicle or upgrading a modern classic, the **Motorad SX-74KQ** stands as a reliable, long-lasting solution that combines precision engineering with timeless automotive heritage.

Buying a replacement fuel tank cap for a 1981 1987 Audi 5000/100/200 (specifically the **Motorad SX-74KQ** or **Gas Storage Air MD** model) involves weighing several factors to ensure compatibility, quality, and long-term reliability.

### **Pros of Buying a Replacement Fuel Tank Cap**

1. **Prevents Fuel Evaporation and Emissions** A properly sealed fuel cap reduces fuel vapor leakage, improving fuel efficiency and reducing harmful emissions, which is particularly important for older vehicles with less stringent emissions controls.

2. **Maintains Vacuum in the Fuel System** A faulty or missing cap can disrupt the fuel tank s pressure balance, leading to poor engine performance, fuel starvation, or even stalling.

3. **Prevents Contamination** A damaged or improperly sealed cap allows dirt, moisture, or debris to enter the fuel system, clogging the fuel filter or injector ports over time.

4. **Compliance with Emissions Standards** Many modern vehicles (and some older ones) require a properly functioning fuel cap to pass emissions tests. Even if your Audi doesn t need one today, replacing it ensures long-term compliance.

5. **Easy Installation** Fuel tank caps are relatively simple to replace, typically requiring only basic tools (screwdriver, pliers, or a socket set) and minimal mechanical skill.

6. **Cost-Effective Solution** Replacing a cap is far cheaper than dealing with fuel system issues (e.g., clogged injectors, fuel pump failure, or engine misfires) caused by a failing cap.

7. **Improved Fuel Stability** A sealed cap helps prevent fuel degradation over time, especially in older vehicles where fuel can break down more quickly due to impurities or lack of use.

8. **Compatibility with Aftermarket Modifications** If you ve modified your Audi s fuel system (e.g., upgraded injectors, added a turbo, or switched to ethanol blends), a high-quality cap ensures proper pressure regulation.

### **Cons of Buying a Replacement Fuel Tank Cap**

1. **Potential Incompatibility Issues** Not all aftermarket caps are designed for Audi s specific fuel system pressure requirements. A cap that s too loose may leak, while one that s too tight could cause pressure buildup, leading to gasket failure or fuel line stress.

2. **Quality Variability** Cheap or generic replacement caps may fail prematurely, especially if they re not made from durable materials or lack proper sealing mechanisms. Some may also not fit perfectly, leading to leaks.

3. **Risk of Over-Tightening** If the cap is tightened excessively, it can strip the threads on the fuel tank or damage the gasket, making future replacements difficult.

4. **Limited Availability of OEM-Quality Parts** Original Audi fuel caps (especially for older models) can be hard to find, and aftermarket options may not match the exact specifications of the original.

5. **Potential for Counterfeit Parts** Some online sellers offer knockoff caps that may not meet safety or performance standards, leading to reliability issues.

6. **Time-Consuming Installation** While straightforward, removing the old cap (especially if it s corroded or stuck) can be tricky, requiring patience and possibly penetrating oil or a rubber mallet.

7. **Misdiagnosis of Symptoms** If the issue isn t the fuel cap (e.g., a failing fuel pump, clogged filter, or vacuum leak elsewhere), replacing the cap won t solve the problem, leading to wasted time and money.

8. **Ethanol Fuel Compatibility Concerns** If you use ethanol-blended fuel (common in newer vehicles), ensure the cap is rated for ethanol resistance, as some older caps may degrade over time when exposed to higher alcohol content.

### **Key Considerations Before Purchase**

- **Verify Compatibility** Confirm that the cap is designed for **Audi 5000/100/200 (1981 1987)** and matches the **Gas Storage Air MD** or **SX-74KQ** fuel system specifications. Look for a cap with a **vacuum relief valve** to prevent pressure buildup.

- **Check Material and Seal Quality** Opt for a cap made from **polypropylene or ABS plastic** with a **rubber or silicone gasket** to ensure a tight seal. Avoid caps with brittle or cracked seals.

- **Look for Positive Reviews** If buying online, check customer feedback for reports of leaks, difficulty installation, or long-term durability.

- **Consider OEM vs. Aftermarket** While aftermarket caps are often sufficient, an **OEM or high-quality aftermarket part** (e.g., from **AEM, Walbro, or a reputable European parts supplier**) will offer better reliability.

- **Inspect the Fuel Tank and Gasket** If the fuel tank s threads or gasket are damaged, replacing just the cap won t solve the issue. A new gasket or tank repair may be necessary.

- **Test for Leaks After Installation** After replacing the cap, check for fuel odors around the tank or a hissing sound, which indicates a leak.

### **Conclusion**

Replacing a faulty fuel tank cap on your **1981 1987 Audi 5000/100/200** is a **simple, cost-effective maintenance task** that can prevent larger fuel system problems. The benefits **improved emissions, fuel efficiency, and engine reliability** outweigh the minor drawbacks, provided you select a **high-quality, properly sized replacement**.

### **Recommendation**

- **AEM or Walbro** (known for quality aftermarket parts)

- **OEM Audi replacement caps** (if available)

- **Motorad or Gas Storage Air MD-approved alternatives** (ensure they match the **SX-74KQ** specifications)

2. **Use a Torque Wrench** Tighten the cap to the manufacturer s specified torque (usually **15 20 ft-lbs**) to avoid over-tightening.

3. **Inspect the Fuel System** While replacing the cap, check the **fuel filter, fuel lines, and tank gasket** for wear or leaks.

4. **Monitor for Issues Post-Installation** If you experience **fuel odors, poor engine performance, or check engine lights**, recheck the cap and surrounding components.

**Final Verdict:** **Yes, replace the fuel tank cap** it s a low-risk, high-reward maintenance step that keeps your Audi running smoothly and prevents future headaches. Just ensure you get the **right part** and install it correctly.

Details:

MotoRad Fuel Tank Cap for 1981 - 1987 Audi Coupe Gas Delivery storage Air md: Status: In Stock.

part #: sx74kq prices

• $23.06-$29.96

specifications fueltanksysteme:

• for makes: Audi
• for years: 1981-1987
• brand: Motorad
• mpn: Sx-74kq
• type: Fuel Tank Cap
• placement on vehicle: Air Fuel Delivery Hardware Fasteners Fittings
• item width: 3.000
• item length: 3.250
• manufacturer warranty: 1 Year
• ipn: C272 5-5
• compatible model: Coupe
• compatible year: 1987 1986 1985 1984 1983 1982 1981
• core charge: Free No Core Charge
• fitment type: Direct Replacement
• bundle description: 1 Pc Genuine Motorad Fuel Tank Cap

returns fueltanksysteme:

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

shipping fueltanksysteme:

• transit: 4-7 Days
• type: Fixed
• class: Standard, Expedited
• service: Standard, Expedited
• cost: $0.00

general fueltanksysteme:

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

payments fueltanksysteme:

• credit card: Mastercard
• wallet: Paypal
• other

offer fueltanksysteme:

• options: Ship-to-home
• sold: 0
• quantity: 10
• availability: In Stock
• started: May 2, 2026

seller fueltanksysteme:

• # reviews: 652615
• city: Indianapolis, Indiana
• rating: 99.6%

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