BMW R850 Maintenance Manual page 51

3. Observe the fuel filter mounted on the removed fuel pump assembly. Loosen
the four crimped hose clamps and remove the filter and two short fuel hoses.
One of the fuel hoses has a 180-degree bend, for reference.
4. Replace the filter, two hoses and four crimped clamps with ONE 10" length of
new fuel injection hose and two new fuel injection clamps. Loop the new hose
180 degrees to bypass the entire fuel filter setup you just removed. Be sure to
align the hose and clamps for neatness and non-interference with the fuel level
float.
5. Reinstall the fuel pump assembly (with new "O" ring) onto the tank. Be careful
to NOT over torque the six Allen head screws, since the nut plates in the tank are
known to sometimes strip out.
6. Observe the two fuel injection hoses leaving the outside of the tank from the
pump assembly. The UPPER hose is the "return" hose and the LOWER is the
"supply" or pressure hose.
7. Replace the UPPER fuel injection hose with the same length new hose. Use
another new clamp at the fuel pump end.
8. Replace the LOWER fuel injection hose with all of your remaining new hose. It
will be cut twice later. Again, use a new clamp at the fuel pump end.
9. Install the tank. Don't forget the electrical connectors and vent lines. Smile!
You will NEVER have to remove it again for filter replacement!
10. Install the UPPER "return" hose, with new clamp, to the UPPER plastic
distribution line.
11. Run the entire length of the LOWER "supply" hose along and under the
UPPER "return" hose. Continue to route it towards the rear, above the clamp
holding the steel brake lines, then inside and out to the right BETWEEN the two
brake lines just forward of the rear subframe mounting boss casting on the
transmission.
12. Mount your new filter using the cable clamp, the 4mm diameter longer screw
and the spacer in place of the screw where the brake lines are clamped to the
transmission casting below the right throttle body. The filter fuel direction arrow
should be pointing forward. The center fuel filter circumvential flange on the
Deutsch should be forward of the clamp.
13. Carefully gauge the correct length of fuel hose needed to make a neat 180-
degree turn and connection to the input (rear end) of the fuel filter. Cut and install
the "supply" hose to the rear of the filter using another new clamp. Position the
open ends of the clamp down before tightening.
14. Now install the remaining length of fuel hose to the outlet (forward end) of the
filter, again using a new clamp. Feed the new hose forward, up and inside of the
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