MODERN BURNER UNIT (MBU)
REPLACE FUEL FILTER
THIS SECTION COVERS:
Replace (300 Hours)
MBU shut-down and cooled (WP 0005)
Drain MBU Fuel Tank (WP 0011)
O-Ring (WP 0061, Table 1, Item 3)
Tools and Special Tools
Rags (WP 0060, Table 1, Item 1)
Cross tipped Screwdriver (WP 0038, Table 2, Item 1)
Cleaning Brush (WP 0060, Table 1, Item 2)
Replace in-tank fuel filter . Replace the in-tank fuel filter on the regulator assembly more often in dusty
or extremely humid conditions or whenever recommended as part of a troubleshooting procedure.
Fire / Fuel Contamination
Before proceeding with this procedure, the MBU fuel tank must be drained completely as
described in work package 0011. Have rags on hand to clean up fuel spillage that may
occur to prevent contamination. Do not perform this procedure near an open flame to
Remove four screws (1) holding fuel regulator assembly (2) to tank (3).
Remove fuel regulator assembly (2) from tank (3) as shown.
Discard O-ring (7).
Pull fuel filter (4) off the regulator shaft (5).
Install new fuel filter (4) onto regulator shaft (5).
Lubricate with a small amount of fuel and install new O-ring (7).
Check the fuel regulator air vent (6) for dirt or debris and clean with a small soft-bristle brush. Do not use
any tool that will force the debris into the filter surface or damage it in any way.
Re-install fuel regulator assembly (2) into tank (3) and secure with four screws (1).