TM 9-2320-269-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ENGINE - CONTINUED
EXHAUST SHOWS BLACK OR GREY SMOKE - CONTINUED
Step 3. Check fuel system for dirt.
a. Disconnect fuel lines (4) one at a time from in-tank fuel pump (5) and
secondary fuel filter (6) using 5/8-inch and 3/4-inch wrenches.
b. Connect rubber hose to fittings (7). Hold catch pan under hose, and have
assistant turn key switch to the ON position. Hold primer switch to the ON
position for 3 to 5 seconds. Disconnect hose.
c. If fuel is dirty, clean or replace fuel tank (8) (page 2-160) or fuel filters (6) and
(9) (page 2-178) as needed.
d. Connect fuel lines (4) to in-tank fuel pump (5) and secondary fuel filter (6) using
5/8-inch and 314-inch wrenches.
e. If exhaust still shows black or gray, notify Direct Support Maintenance.
TA228591
2-65
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