Radium Engineering In-Tank Fuel Hanger Feed System w/ Microglass Filter – BMW | 20-0475-05

Radium Engineering’s in-tank fuel hanger feed system with microglass filter for BMW — a complete in-tank surge tank solution that mounts inside the OEM BMW fuel tank using the factory fuel pump hanger location. The OEM BMW fuel pump acts as a lift pump, continuously feeding the Radium surge tank mounted inside the fuel tank. Surge pumps (not included — sourced separately to match your fuel flow requirements) then feed the engine from the surge tank. Eliminates fuel starvation under high-G cornering, hard acceleration, and low-fuel-level conditions that would unport a standard in-tank pump. The microglass filter on the surge tank inlet provides high-flow pre-filtration to protect aftermarket surge pumps from fuel tank debris. Designed for high-power BMW builds running upgraded fuel systems where the OEM fuel delivery architecture cannot support the required fuel flow.

⚠️ Fitment note: Verify exact chassis compatibility using Radium Engineering’s fitment guide (radiumengineering.com) before ordering. This is a high-value fuel system component — confirm your specific BMW model, chassis code, and production date are compatible with P/N 20-0475-05 before purchasing.

How the System Works

Standard in-tank fuel pumps are vulnerable to fuel starvation in high-performance applications — under sustained high-G cornering, hard acceleration, or when the fuel level is low, fuel sloshes away from the pump inlet, allowing the pump to momentarily draw air. On a high-power engine running at the limit of its fuel system, even a brief starvation event causes a lean condition that can damage the engine. Baffled fuel tanks and modified sumps are one solution; in-tank surge tanks are another — and for BMW applications where tank modification is undesirable, the Radium in-tank system is the cleanest approach.

The Radium hanger system works as follows: the OEM BMW fuel pump (retained) acts as a low-pressure lift pump, continuously filling the Radium surge tank mounted inside the factory fuel tank. The surge tank maintains a constant supply of fuel regardless of fuel level or vehicle attitude. High-flow aftermarket surge pumps mounted inside the surge tank then supply the engine at the pressure and flow rate required for the build. Because the surge pumps draw from a contained reservoir rather than the open tank, fuel starvation is eliminated even at low fuel levels and under sustained lateral G-forces on track.

Key Features

• In-Tank Surge Tank: Mounts inside the OEM BMW fuel tank using the factory hanger location — no external surge tank, no external plumbing running through the chassis. The cleanest possible surge tank installation for a BMW build
• OEM Lift Pump Architecture: Retains the factory BMW fuel pump as a lift pump feeding the surge tank — no need to remove or bypass the OEM pump. The factory pump and fuel level sender are retained
• Microglass Filter: High-flow microglass pre-filter on the surge tank inlet — finer filtration than a standard fuel sock filter, protecting high-flow aftermarket surge pumps from fuel tank debris and particulate contamination. Critical for pump longevity on a build running expensive high-flow surge pumps
• Surge Pumps Not Included: The hanger feed system is the mounting and filtration infrastructure — surge pumps are sourced separately to match your specific fuel flow requirements (injector size, fuel type, target power level). Radium Engineering offers compatible surge pump options
• Radium Engineering Quality: Radium Engineering is one of the most respected fuel system specialists in the US performance market — their in-tank hanger systems are used on high-power builds from track cars to competition vehicles where fuel system reliability is not negotiable
• Eliminates Fuel Starvation: Surge tank architecture completely eliminates the fuel starvation risk that exists with standard in-tank pump setups under cornering, acceleration, and low-fuel conditions

What’s Included

• Radium Engineering in-tank fuel hanger feed assembly
• Microglass pre-filter
• Mounting hardware
• Surge pumps not included — sourced separately

Fitment

Verify exact fitment using Radium Engineering’s official fitment guide at radiumengineering.com before ordering. The Radium BMW hanger series covers multiple BMW chassis and model years — confirm that P/N 20-0475-05 is the correct part for your specific BMW model, chassis code (E46, E9x, F-series, etc.), and production date. Incorrect hanger selection will result in a part that does not fit the factory fuel tank hanger opening.

This is a high-power fuel system component intended for race, track, and high-performance street builds. Installation requires draining the fuel tank and working with fuel system components — all applicable fire safety precautions must be observed. Professional installation by a qualified fuel system technician is strongly recommended. Surge pumps must be sourced and sized separately for your specific fuel flow requirements. A fuel system upgrade of this nature typically requires supporting modifications including a fuel pressure regulator, AN fuel lines, injector upgrades, and ECU tuning — consult with a qualified fuel system specialist before purchasing.

Specifications

• Brand: Radium Engineering
• Part Number: 20-0475-05
• Filter Type: Microglass Pre-Filter
• System Type: In-Tank Surge Tank / Fuel Hanger Feed
• OEM Pump: Retained as lift pump (OEM pump not included)
• Surge Pumps: Not included — sourced separately
• Application: BMW — verify chassis fitment at radiumengineering.com
• Weight: 3.8 lbs