Radium Engineering 20-0950 Fuel Hanger Surge Tank for 1993-95 Mazda RX-7 FD

Vehicle Fitment

• 1993-95 Mazda RX-7 (FD, 13B-REW rotary engine) - US models
• 1992-02 Mazda RX-7 (FD, 13B-REW rotary engine) - JDM/other markets

Features

• Integrated 1.85 L surge tank built into the in-tank fuel hanger to eliminate fuel starvation.
• Permits installation of 1, 2 or 3 high-pressure aftermarket pumps plus a lift pump inside the OEM tank.
• No grinding, bending or modification of the trunk floor sheet metal required - OEM bolt-in design.
• 10 AN ORB feed port and 8 AN ORB return port (with low-profile 8 AN/6 AN male fittings included) for high-flow plumbing flexibility.
• High-current stainless steel electrical studs and ETFE insulated wiring designed for fuel-resistant operation and motorsport use.
• Compatible with gasoline and ethanol fuels (E85) when matched with suitable pumps and plumbing.
• Works with aftermarket high-flow pumps such as Walbro GSS342 or AEM 50-1200 (pumps sold separately).
• Designed for serious builds - drag, road-race and club track use where fuel system reliability under high G & boost loads is crucial.

Specifications

• Surge tank capacity: 1.85 litres (approx.) built into the module.
• Feed port: 10 AN ORB male (factory feed adapter included).
• Return port: 8 AN ORB male (factory return adapter included or barb fittings provided).
• Installation: Direct-drop replacement fuel hanger/strainer module for Mazda RX-7 FD; retains OEM tank fitment and fuel level sender.
• Pump compatibility: Supports pumps such as Walbro GSS342, AEM 50-1200 (installer to provide pumps, wiring and plumbing).

Included Components

• 1x Radium Engineering 20-0950 fuel hanger surge tank module
• 1x 10 AN ORB male feed fitting (low profile 8 AN male adapter included)
• 1x 8 AN ORB male return fitting (low profile 6 AN male adapter included)
• High-current stainless steel wiring studs and terminals
• Sealing gaskets and installation hardware for drop-in tank fitment

Product Description

The Radium Engineering 20-0950 Fuel Hanger Surge Tank is a high-performance upgrade designed exclusively for the Mazda RX-7 FD (13B-REW) platform. Built for builds that demand high-flow fuel delivery and zero pump starvation under aggressive driving, cornering or boost load, the unit replaces the factory fuel hanger inside the tank and adds an internal surge chamber to maintain full pump pickup at all times. The design allows for multiple aftermarket pumps, high-flow plumbing and installation without cutting or modification of the trunk floor.

Installation retains the OEM tank shell and fuel level sender, simplifying the process while significantly improving fuel system resilience. With carefully designed feed and return ports and included high-flow wiring hardware, the 20-0950 is ideal for turbocharged, high-HP FD RX-7 builds. For maximum benefit, pair with suitable high-volume pumps, correctly adjusted fuel pressure regulator and return plumbing. This module is intended for serious performance builds where fuel reliability and peace of mind are crucial.