CHAPTER 4: MAINTENANCE OF MAIN ENGINE FUEL, AIR INTAKE, AND EXHAUST SYSTEMS
4-15 REPLACE FUEL/WATER SEPARATOR FILTER ELEMENTS--Continued
Do not remove or otherwise disturb center
(final) filter element during semiannual
outer filter element replacement. If center
(final) filter element is removed, it must be
3 Remove and discard two outer filter elements (9)
(or if necessary, center [final] filter element  ).
Rotate elements to facilitate removal.
1 Install two new outer filter elements (9).
2 Install new gasket (7) and cover (6) with eight
screws (3), eight new lockwashers (4), and eight flat
3 Close drain cock (1). Operate electric fuel pump until fuel flows from bleeder valve (2). Tighten bleeder
valve. Check for leaks.
Follow-on maintenance: Install grille doors (see paragraph 9-57)