Motorad MGC931 Fuel Tank Cap

Fuel Tank Cap for VW, Audi, BMW and Mini

The Motorad Standard MGC931 fuel tank cap is a round, black plastic replacement cap built to OE-quality material and safety standards. It is designed for vehicles that need a standard replacement fuel cap with a push-fit mounting style and an integrated rubber O-ring seal.

Compatible With select Volkswagen Jetta, Taos, GTI, Tiguan, Atlas, Passat, Golf, Beetle and Audi A3, Q3, Q7, Q8 applications, this cap is also used across many BMW, Mini and Porsche models. The MGC931 is engineered with pressure and vacuum relief valves to help control fuel vapor loss and meet state and federal emissions requirements.

• Standard replacement fuel tank cap for gas tank sealing
• Plastic construction with black finish
• Push-fit mounting type with round shape
• Pre-installed rubber O-ring seal included
• Not vented and not lockable
• Designed to pass emissions requirements
• Neck diameter and thread diameter: 1.80 in

Product Details and Fitment

Motorad Standard MGC931 is a direct-style fuel cap for vehicles that use a 1.80 in neck and thread diameter. The standard line focuses on OE-style replacement parts for everyday service work, and this cap follows that approach with a simple push-fit design, sealed construction, and no indicator markings. It is a practical choice for drivers addressing a loose, damaged, or missing fuel cap on Volkswagen, Audi, BMW, Mini, or Porsche platforms.

This part cross-references OE-style numbers such as 5C0201550AD and 5Q0201550N for the same application.

What It Helps Fix

• Check engine light caused by a poor fuel cap seal
• Fuel vapor odor around the filler neck
• Evaporative emissions faults related to cap leakage
• Loose, cracked, or missing fuel tank cap
• Fuel evaporation from a cap that no longer seals properly

Installation Notes and Tips

Verify the filler neck diameter before installation and confirm the cap seats fully with the push-fit cam design. Inspect the sealing surface and neck for dirt, damage, or deformation before installing the new cap. After installation, tighten or seat the cap until it is fully engaged and clear any stored evaporative emissions codes if required by the vehicle.

Quality Assurance

Motorad manufactures this cap using OEM-quality materials and safety standards as an OE supplier. The MGC931 is built to meet emissions requirements and uses pressure and vacuum relief valves to help reduce fuel evaporation.