Radium Fuel Pump Hanger | 1998-2006 BMW E46 Including M3 (20-1180)

The E46 uses two fuel hats and a saddle tank. Radium replaces both and keeps the crossover working properly.

The Radium Engineering fuel pump hanger for the BMW E46 replaces both the RH and LH fuel hat assemblies with a drop-in system that accepts one or two aftermarket pumps, brushed or brushless. Both the passive side and active side fuel level sensors are reused, so the gauge keeps working, and a true saddle tank crossover is retained using improved components. No cutting or modification of the car is required.

What You'll Feel

• Fuel pressure that survives sustained cornering instead of starving out of the collector
• A working fuel gauge on both sides of the saddle tank
• Room to run one pump now and a second later, brushed or brushless
• No stranded car from a popped-off jet pump connection when a high flow pump returns hard at low load

Features

• Drop-in replacement for both RH and LH fuel hat assemblies
• Runs 1 or 2 aftermarket pumps, 2-wire brushed or 3-4 wire brushless
• PRV venturi jet pump siphon with built-in pressure relief valve
• Merged 10AN ORB (7/8in-14) female pump outlet with SAE quick connect barb for the OEM feed line
• 10AN ORB female return inlet with 8.5mm barbed adapter for the OEM return line
• Fittings machined low to clear the surrounding area
• Anti-rotation stainless electrical studs, hermetically sealed, with non-conductive acorn nuts
• ETFE insulated in-tank wiring, fuel pump filter socks included
• Gas, methanol, and E85 compliant

The Details

The PRV venturi jet pump is the real engineering story here. High flow pumps at low load push excessive return flow, which on a stock E46 pops the OEM venturi jet pump connection apart, stops fuel transfer from the passive side, and eventually strands the car. Radium's version has a built-in pressure relief valve to control that flow, and it also permits low static fuel pressures. The collector bowl is fed from three directions: the OEM labyrinth that holds fuel during cornering, the constant low pressure regulator return, and crossover fuel scavenged from the passive side by the jet pump siphon.

Single pump installs can reuse the OEM fuel pump wiring, though upgrading it is recommended so the pump sees full voltage. A second pump must have its own dedicated relay and fuse; a Radium DIY wiring kit covers each aftermarket pump. Pumps without an integrated check valve, such as the Walbro F90000295, can use the 20-1534 check valve kit in place of the fittings under the fuel hat.

Kit Includes

• Hanger tops for both feed and return sides, partially assembled
• Complete new jet pump system
• All parts to install 1 or 2 compatible pumps, including filter socks
• Electrical parts kit for external wiring at the hanger top
• NOT included: fuel pumps and plumbing kit

Applications

• 99-05 BMW E46 316i, 98-06 318i, 98-06 320i, 98-00 323i, 01-06 325i, 98-00 328i, 00-06 330i, 03-06 330i ZHP
• 00-06 BMW E46 M3 and 03-04 M3 CSL

Important Notes

• Compatible with OEM BMW (VDO) senders only; NOT compatible with aftermarket Bosch senders
• A second pump requires its own dedicated relay and fuse