Radium Fuel Hanger Surge Tank | 2009-2020 Nissan 370Z (20-1820)

The 370Z's saddle-bag tank starves on track, and there is nowhere safe in an open cabin to bolt a conventional surge tank.

With no firewall between driver and fuel system, mounting a stand-alone surge tank in a Z34 is a compromise nobody should make. The Radium Engineering Fuel Hanger Surge Tank (FHST) solves it by building a fully functional surge tank inside the OEM fuel tank: the factory hanger with an upgraded pump becomes the lift stage keeping the FHST collector full, while one or two aftermarket pumps inside the FHST supply 1:1 regulated fuel to the engine. No grinding, bending, or sheet metal modification anywhere. Pumps sold separately; choose the configuration built for yours.

What You'll Feel

• Rock-steady fuel pressure through the long corners that used to trigger lean spikes
• A surge tank solution that never enters the cabin, since it lives inside the OEM tank
• Room for one or two pumps, staged if desired, scaling with the build
• Factory scavenging intact, with the OEM venturi jet pumps still pulling from the tank bottom
• A complete install from one box, down to the gauge, relay, and fuse

Features

• Fully functional surge tank integrated into the OEM fuel tank, working with the factory hanger as the lift stage
• Supports 1 or 2 surge pumps with 1:1 regulated fuel supply to the engine
• Configurations: 20-1820 (Walbro GSS342, AEM 50-1200), 20-1821 (Ti Automotive brushless, with two bolt-on check valves for staging and pressure hold), 20-1822 (Walbro F90000267/274/285)
• Optional FPR block-off (20-0806, sold separately) converts the built-in regulator dead-head system to return style with an external regulator, using the return port in the hanger top plate
• Comprehensive kit: pressure gauge, external fuel hose, fittings, electrical fuse, and relay included
• No grinding, bending, or modification of vehicle sheet metal

The Details

The architecture splits duties between two hangers. The OEM unit, fitted with an upgraded lift pump, feeds the Radium FHST and keeps its collector box full, while the OEM venturi jet pumps keep scavenging the saddle tank exactly as Nissan designed. Inside the FHST, your surge pumps draw from that captive, slosh-proof volume and send regulated fuel forward, so cornering load never reaches the engine as a pressure dip. Pick your configuration by pump style, since each version ships with the matching electrical connectors and small parts, and the kit arrives partially assembled with plumbing for one or two pumps. The brushless version's bolt-on check valves matter for two reasons: they allow pump staging, and they hold fuel pressure in the system after shutdown, which brushless pumps cannot do on their own. Builders wanting an engine-bay regulator instead of the built-in unit can add the FPR block-off kit and run a conventional return. Pumps are sold separately.

Kit Includes

• 1x Partially assembled FHST in selected pump configuration
• Plumbing components for 1 or 2 surge tank pumps
• Fuel pressure gauge, external fuel hose, and fittings
• Electrical fuse, relay, and configuration-matched connectors
• 2x Bolt-on check valves (20-1821 brushless version)
• Fuel pumps NOT included, sold separately

Applications

• 2009-2020 Nissan 370Z (Z34, right or left hand drive)
• 20-1820: Walbro GSS342 or AEM 50-1200 surge pumps
• 20-1821: Ti Automotive brushless surge pumps
• 20-1822: Walbro F90000267, F90000274, or F90000285 surge pumps