Radium Engineering FCST 6-Bolt to 3-Bolt Fuel Cell Filler Neck Adapter RAD20-1127

Fuel cell fill neck adapter for Radium Fuel Cell Surge Tanks (FCST). Allows modern 3-bolt fill necks to be used on older FCST models that have 6-bolt filler neck hole-patterns.

The Radium Engineering FCST 6-Bolt to 3-Bolt Fuel Cell Filler Neck Adapter enables the installation of a modern three-bolt fuel cell fill neck on older Radium Fuel Cell Surge Tank (FCST) models designed with a six-bolt filler neck mounting pattern. This adapter provides a practical mounting solution when updating or replacing the filler neck while retaining compatibility with the existing FCST tank configuration.

Designed specifically for Radium Engineering Fuel Cell Surge Tanks, part number RAD20-1127 helps bridge the difference between legacy and current filler neck designs. It is suited for automotive fuel system applications where a secure, properly matched filler neck interface is required. The adapter supports a cleaner installation and simplifies component compatibility during fuel system upgrades or service work.

Important: This product is not emissions or CARB approved and is not intended for use on vehicles requiring CARB-compliant components. Verify the fuel cell model, filler neck bolt pattern, and surrounding clearance before installation. Professional installation is recommended to ensure proper alignment and sealing of all related fuel system components.

What's Included

• One Radium Engineering FCST 6-bolt to 3-bolt filler neck adapter

Fitment

Fits older Radium Engineering Fuel Cell Surge Tank models with a six-bolt filler neck hole pattern and adapts them for use with modern three-bolt fill necks. Confirm vehicle and fuel cell compatibility before ordering.

Features:

• 6-Bolt to 3-Bolt Conversion: Adapts older Radium FCST filler neck mounting patterns for modern three-bolt fill necks.
• FCST Compatibility: Designed for use with Radium Engineering Fuel Cell Surge Tank applications.
• Simplified Fuel System Upgrade: Helps update legacy fuel cell configurations without replacing the entire surge tank.
• Automotive Installation Support: Provides a purpose-built interface for fuel system service, replacement, and component upgrades.

Air Freight Prohibited: false
Not Carb Approved: true
Carb Acknowledgement Required: true
Ltl Freight Required: false
Prop 65: Unknown
Part Type: automotive
Epa: N/A
Units Per Sku: 1
Regular Stock: t