MODERN BURNER UNIT (MBU)
UNIT MAINTENANCE PROCEDURES
FUEL REGULATOR ASSEMBLY
THIS SECTION COVERS:
MBU shut-down and cool (WP 0005)
Drain Fuel Tank (WP 0011)
O-ring (WP 0061, Table 1, Item 3)
Tools and Special Tools
Shop Equipment Automotive Maintenance and Repair:
Organizational Maintenance, Common No.1 (WP 0038, Table 2, Item 2)
This procedure contains information and instructions to keep the MBU in good working order by
inspecting and replacing the entire fuel regulator assembly, consisting of the regulator, fuel pick-up tube,
connector fitting, fuel filter, 450 elbow fitting, four mounting screws, and an O-ring.
Two Person Lift
The MBU weighs approximately 58 pounds fully fueled (26.3 kg). Two persons must carry the
fully fueled MBU, lifting with legs, not back, to prevent injury.
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 prevent fire.
Inspect the regulator assembly for proper seating on the fuel tank. Check for security of the valve head,
and fuel line fitting. Ensure vent is not clogged.
To replace the Fuel Regulator Assembly (1), disconnect the fuel feeder line (4) by loosening the
compression fitting nut (3) from the fuel regulator fitting (7).
Remove the four retaining screws (5).