TM 10-7310-281-13&P
MODERN BURNER UNIT (MBU)
0023 00
UNIT MAINTENANCE PROCEDURES
0023 00-10
Replacing the Fuel shut-off Solenoid Valve. To replace the fuel shut-off solenoid valve (1), disconnect
the solenoid valve wiring harness (2) by separating the connector at the end of the harness assembly.
It may be necessary to grasp the body of the solenoid valve (1) to keep it from turning prior to the next
step. Loosen and remove the nut (3) on the end of the solenoid valve (1). Loosen and remove the
retaining screw (4) securing the fuel shut-off solenoid valve (1) to the fuel delivery block (5) with a flat
blade screwdriver. Take note of the orientation of the wiring harness (2) so that it may be installed in its
proper position later in this procedure.
A small spring tensioned plunger is located inside the solenoid valve. Take care not to drop the plunger
into the MBU. Carefully remove the solenoid valve assembly by pulling straight out.
Install a new fuel shut-off solenoid valve (1) in the fuel delivery block (5). Be certain that the plunger is
installed in the solenoid body so that the end of the plunger with the spring is inserted into the solenoid
body first. The end of the plunger with the small rubber pad should face out of the solenoid.
The base of the solenoid valve (1) should be flush with the fuel delivery block (5) when properly installed.
Rotate the body of the solenoid so that the wiring harness assembly (2) is as it was prior to removal.
Reinstall the retaining screw (4) through the body of the solenoid and tighten. Reinstall the nut (3) and
tighten. Reconnect the connector at the end of the solenoid wiring harness assembly (2).
Replacement of Fuel shut-off Solenoid Valve
1
2
4
5
3
