Dorman Fuel Tank Lock Ring 579-102 — Direct-Fit Replacement, Durable Metal Seal

The Dorman 579-102 fuel tank lock ring is a direct-fit replacement that secures the sending unit to the tank for reliable, leak-resistant performance.

When you remove or service a vehicle's fuel sending unit, the lock ring that holds it in place is a critical component to replace if it shows wear or damage. The Dorman 579-102 is engineered to match the original equipment's fit and function while offering the durability needed for dependable service life. Using a dedicated replacement lock ring helps restore a proper seal, maintain correct fuel system alignment, and minimize the risk of fuel vapor leaks or loose connections.

How does this lock ring match the original part?

The Dorman 579-102 is manufactured to mirror the OEM dimensions and engagement features so it installs the same way the factory piece did. That means the thread engagement, tab positions, and sealing surface align with the sending unit and tank collar it was designed for.

• Exact-fit geometry to match factory mounting points
• Compatible engagement profile for standard sending units
• Designed for the same installation method as the original ring

Why replace the lock ring when servicing the sending unit?

Lock rings can become bent, corroded, or worn during removal and reinstallation, undermining the seal and mechanical hold. Replacing the ring while the tank is open is a low-cost way to ensure proper sealing and avoid future fuel system repairs.

• Prevents potential leaks from compromised threads or tabs
• Restores a secure mechanical hold for the sending unit
• Helps maintain correct fuel system pressure and alignment

What materials and durability features does it offer?

Dorman builds this lock ring from materials chosen to resist typical fuel system exposure and to provide stable service life. The construction reduces risk of premature failure from vibration, fuel contact, or environmental corrosion.

• Durable metal formulation suited for fuel tank environments
• Precision-formed to resist deformation under torque
• Tested design backed by experienced product engineers

How do I confirm compatibility with my vehicle?

Before ordering, verify fit by entering your vehicle's year, make, model, and trim into the product garage or compatibility tool. That ensures the Dorman 579-102 aligns with your fuel tank and sending unit configuration.

• Use the online garage tool to confirm exact fitment
• Cross-check OEM part numbers if available
• Contact support with vehicle details for additional guidance

Who is this for: The Dorman 579-102 fuel tank lock ring is aimed at professional technicians, DIY mechanics, and fleet maintenance teams who want a dependable, direct-replacement part when servicing fuel sending units. It’s ideal for anyone replacing a sending unit, repairing a fuel tank seal, or restoring factory mounting integrity without modifying the original assembly. If you need a rugged, precisely formed lock ring to return your fuel system to proper fit and function, this part offers an economical, engineered solution.