TM 9-2350-256-20b. INSTALLATION234567891011CAUTIONUse of replacement filters other than those specified in TM 9-2350-256-20P will cause damage to theAPU engine.1Install ID plate (19) with four new rivets (20).NOTEWhen replacing fuel filters (15 and 16),remove plug from bottom of new filter andinstall dram cock (12) from old filter.Install primary fuel filter (15) and secondary fuelfilter (16) each with one screw (17) and one newflat washer (18).Install APU engine fuel filters and fittings (11) withthree screws (13) and three new lockwashers (14).Connect fuel line (2) on primary fuel filter (15) andfuel line (8) on secondary fuel filter (16).Install U-bolt (7) over fuel line (8) with two newlockwashers (10) and two nuts (9).Install clamp (1) over fuel line (2) with screw (6), flat washer (5), new lockwasher (4), and nut (3).Bleed fuel system after installation of fuel filters.Disconnect fuel return line (21)(22).at return line fittingNOTEIf pump lobe of camshaft is up, crankengine one revolution to permit handpriming.Operate priming lever (23) on fuel transfer pump(24) until no oil bubbles appear in fluid flowingfrom return line fitting (22).Connect fuel return line (21) to return line fitting(22).Return priming lever (23) to disengaged position for normal operation.NOTEFollow-on maintenance:Close left front air inlet grille doors (see paragraph 9-57)13-7
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