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 TM9-2320-270-20-1
TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5. ENGINE RUNS ROUGH CONTINUED.
WARNING
Stay clear of fan while engine is being cranked. Failure to do so could result in serious
personal injury or death.
Disconnect fuel inlet hose (1) from fuel pump inlet elbow (2). Connect vacuum
Step 7.
gage to inlet elbow (2). While assistant is cranking engine, note reading on
vacuum gage.
a. If gage shows less than 6 in. (15 cm) Hg of vacuum, replace fuel
pump (page 4-37).
b. If gage shows more than 6 in. (15 cm) Hg of vacuum, remove,
clean, inspect and install fuel lines and fittings (page 4-40), and
purge fuel system (page 4-32).
c. If engine still runs rough, install right side panel and close right side
hood (TM 9-2320-270-10), and notify support maintenance.
3-26
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