Radium Engineering BMW E46 Fuel Pump Hanger - 20-1180

This Radium Engineering fuel hanger replaces both RH and LH fuel hat assemblies. It is compatible with 1 or 2 aftermarket fuel pumps. The kit reuses both passive side and active side fuel level sensors. It is also keeps a true saddle tank crossover system using new improved components. No cutting or modifying of the vehicle is required for installation.

FITTINGS

The merged single pump outlet port is tapped for 10AN ORB (7/8"-14) female threads on the top plate. An SAE quick-connect barb fitting is provided to connect to the OEM feed line.

The fuel return inlet is tapped for 10AN ORB (7/8"-14) female threads on the top plate. An 8.5mm barbed adapter is provided to connect to the OEM return line.

All fittings are machined low enough to clear the surrounding area.

FUEL STARVATION PROTECTION

Several mechanisms work together to move fuel into the integrated collector bowl and keep it full at all times. This ensures the pump(s) have adequate fuel available, even during aggressive driving. The integrated fuel tank collector is supplied with fuel from 3 different sources:

• The OEM collector bowl has a labyrinth. This keeps fuel from leaving the collector bowl when cornering.
• The constant low pressure returning fuel from the regulator activates the venturi jet pump siphon and also fills the collector bowl.
• The crossover fuel scavenged from the passive side of the tank from the venturi jet pump siphon is constantly filling the collector bowl.

PRV VENTURI JET PUMP

The OEM venturi jet pump is replaced with an innovative Radium Engineering variation.

The venturi jet pump has a built-in pressure relief valve to control excessive fuel return flow. This is a common problem when using high flow pump(s) at low loads. This excessive pressure would pop-off the OEM venturi jet pump connection and prevent fuel transfer, ultimately leaving the vehicle stranded. The PRV venturi jet pump also permits low static fuel pressures.

ELECTRICAL

The custom designed stainless steel electrical studs easily handle the high current demand that compact multi-pin bulkhead connectors lack. They have an anti-rotation feature that prevents the terminals from spinning when tightening the nuts. These serviceable connections are hermetically sealed and impervious to all standard and exotic fuels. Non-conductive anodized aluminum acorn nuts are provided to prevent any accidental short circuiting. Furthermore, the in-tank wiring is insulated with high quality chemically resistant ETFE.

These kits provide all necessary plumbing to and from the engine including a fuel filter, fuel pressure regulator, fuel lines, adapter fittings, and mounting hardware. 

First, a low profile 8AN male banjo fitting is installed to the fuel hanger pump outlet. 8AN PTFE fuel hose runs to the LH side over the top of the fuel tank. It then turns downward and routes along the underside of the chassis through 2 billet fuel/brake line retainers. A new billet high flow fuel filter is mounted in the OEM location. Elements are either 10 micron stainless (-03) or 6 micron microglass (-05). Go HERE for more filter element information. From the fuel filter outlet, another 8AN PTFE fuel hose runs into the engine bay and towards the front of the fuel rail (not included). A low profile 8AN male banjo fitting is installed to the fuel rail. A direct mount fuel pressure regulator and gauge is mounted at the rear of the fuel rail.

A new 6AN return hose with an SAE quick connect adapter is constructed to route fuel from the direct mount regulator to the rear. A low profile 6AN male banjo fitting is installed to the fuel hanger return port, as shown below.

New vacuum tubing is provided to replace the OEM hard lines.