INSTALLATION INSTRUCTIONS FUEL FILTER/FPR KIT 1 2 3

Document: 19-0205

STEP

INSTALLATION INSTRUCTIONS

FUEL FILTER/FPR KIT

2001-2006 BMW E46 M3

Raise and safely support the vehicle. Remove the metal cover from the

area of the fuel filter.

INSTRUCTIONS

PHOTO

TOOLS NEEDED

Disconnect the vacuum line from the fuel pressure regulator (FPR).

To relieve fuel pressure, access the Schrader valve on the FPR just in the

front of the fuel filter. Remove the metal cap and surround the valve with a

towel. Use a small screwdriver or other tool to press the center of the

valve. Have a rag handy as fuel will release under pressure.

Once pressure is relieved, disconnect the fuel lines from the inlet of the

filter and the outlet of the regulator. This is done by pressing the plastic

retainers into the hoses and then pulling off the fittings.

Insert-picture-browse to picture

Make 1.53" tall

Rag

8MM Socket

10MM Socket

Remove the nut holding the fuel filter bracket in place and remove the fuel

filter/FPR assembly from the vehicle.

Follow steps 4-16 for P/N: 20-0430

Follow steps 17-22 for P/N: 20-0429

Support: info@radiumauto.com

5/64 Allen wrench

Oil Lubrication

P/N: 20-0430 INSTALLATION

NOTE: There are 2 provided orifices. Preinstalled is the smaller silver orifice

and is generally best for most applications. For very high flow pump(s), the

gold orifice can be installed if minimum base static fuel pressure cannot be

achieved. See the MPR instructions for more details.

Find one of the green SAE adapter fittings in the kit and install the smaller

brown o-ring onto the 6AN male side. Screw the 6AN male fitting into the

port shown on the Radium FPR. All o-rings should be lubricated with oil

prior to installation.

Install the two 6AN plugs into the other two ports on the Radium FPR.

At this time, check the orientation of the top cap. The vacuum nipple

should be pointing toward the port with the green fitting installed. If this is

not the case, remove the FPR top cap and clock it to the correct position.

Take care not to disrupt the internal spring and other components.

Reassemble the regulator and tighten down the screws evenly in an

alternating pattern.

Oil Lubrication

On the opposite side of the FPR, install the -10AN male adapter into the

top port and the hose barb adapter into the bottom port, as shown.

Tighten these fittings.

19MM Socket

25MM Socket

Oil Lubrication

On the inlet (black end) of the fuel filter, install the 10AN ORB to 6AN male

adapter and tighten. Then install the female/female 6AN coupler and 6AN

male to 5/16" SAE quick connect adapter, as shown. Tighten all fittings.

25MM Socket

9/18" Wrench

5/8" Wrench

Oi Lubrication

Apply Teflon paste to the fuel pressure gauge threads and screw it into the

inline 1/8” NPT adapter fitting. Tighten finger tight, then add another 1.5

to 3 turns with a wrench.

Install the included O-ring to the male portion of the inline adapter.

Lubricate the O-ring and install to the fuel filter “OUTLET” port.

Adjoin the 2 assemblies by securing the 10AN male and 10AN female

fittings.

PTFE Teflon Paste

1" Wrench

Scissors

Remove the rubber sleeve from the OEM fuel filter and make a single cut

down it's length as shown.

Slide the filter sleeve over the Radium fuel filter.

10MM Socket

Install the fuel filter/FPR assembly in to the factory clamp as shown.

Check the orientation of the pressure gauge and FPR and adjust them if

necessary by loosening the fitting installed in step 8.

When clocking is complete, tighten the nut for the mounting bracket.

Connect the fuel feed line to the fuel filter outlet. Push until a "click" is felt.

Confirm the OEM vacuum hose will reach the FPR vacuum port. NOTE:

fuel pressure is typically adjusted at atmospheric pressure so this vacuum

line can be temporarily removed.

Connect the fuel feed line to the inlet of the filter as shown. Push until a

"click" is felt.

Screwdriver

Hook up the fuel return line to the FPR hose barb fitting, as shown. Re-use

the factory hose clamp. The hose can be cut shorter for best fit. Ensure all

connections are tight.

NOTE: The FPR is not pre-set to any particular pressure.

Turn on the fuel pump and check for leaks. If no leaks are present, proceed

to the next step for fuel pressure calibrating.

Hose cutter

3/32" Allen Wrench

With the pump running, and no vacuum connection to the FPR, turn the

set screw until the desired fuel pressure is achieved while referencing the

gauge. For reference, the stock BMW fuel system operates at 5bar (72.5

psi).

Once adjustment is complete, tighten down the lock nut for the

adjustment screw. Install the metal cover as shown. Some trimming in the

area of the pressure gauge will be required. Alternatively, the pressure

gauge can be removed and a 1/8" NPT plug installed (not included).

3/8" Wrench

10mm Socket

Adjustable Wrench

P/N: 20-0429 INSTALLATION

Use a vice to hold the factory pressure regulator and a wrench to remove

the filter from the regulator.

With the regulator removed, install the provided 6AN to metric thread

adapter into the regulator, as shown. Use the included crush washer to

create the necessary seal.

Oil Lubrication

On the inlet (black) end of the fuel filter, install the 10AN ORB to 6AN male

adapter and tighten. Then install the female/female 6AN coupler and 6AN

male to 5/16" SAE quick connect adapter, as shown. Tighten all fittings.

Apply oil to all o-rings.

25MM Socket

9/18" Wrench

5/8" Wrench

9/18" Wrench

On the outlet (green) end of the filter, install the other 10AN ORB to 6AN

male adapter. Next, install the other female/female 6AN coupler. Make

sure to use oil on all fitting o-rings.

Now screw the female/female coupler to the fitting that was installed in

the regulator in step 17 and tighten.

5/8" Wrench

Scissors

Remove the rubber sleeve from the OEM fuel filter and make a single cut

down the length of the sleeve, as shown.

10mm Socket

Slide the sleeve over the Radium filter body.

Insert the fuel filter inlet SAE quick connect fitting into the fuel feed hose

coming from the rear of the vehicle.

Position the filter/regulator assembly into place and secure with the OEM

filter bracket and nut.

Insert the SAE quick connect hose fitting from the fuel rail to the regulator

outlet.

Flat head screwdriver

Attach the return hose to the OEM regulator return fitting, as shown. Some

trimming of the hose may be necessary. Secure with the OEM hose clamp.

Connect the vacuum reference line to the regulator.

To prime the system, cycle the key a few times and check for leaks.

Address any leaks that are found and then re-test.

Reinstall the shield over the filter assembly.

INSTALLATION COMPLETE

Hose Cutter