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Page Title:
ENGINE STARTS BUT IDLES ROUGHLY - continued |
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 TM 10-3930-673-20-1
4. ENGINE STARTS BUT IDLES ROUGHLY (CONT).
4
KNOWN INFO
TEST OPTIONS
Idle speed OK.
Visual inspection.
Is fuel clean and free from
High pressure fuel lines OK.
REASON FOR QUESTION
Fuel system OK.
If fuel contaminated, engine will not
POSSIBLE PROBLEMS
run smoothly.
Fuel contaminated.
Fuel transfer pump faulty.
Drain and flush fuel
NO
tank, and replace fuel
(Para 5-9).
YES
5
KNOWN INFO
TEST OPTIONS
Idle speed OK.
Visual inspection.
Does fuel flow freely through
High pressure fuel lines OK.
REASON FOR QUESTION
the transfer pump and fuel
Fuel system OK.
If transfer pump and/or fuel filter
filter?
Fuel OK.
faulty, engine will not run
POSSIBLE PROBLEMS
smoothly.
Transfer pump and/or fuel filter
faulty.
Replace faulty
transfer pump
NO
(Para 5-3) and/or
filter elements
(Para 5-15).
YES
Refer to the Electrical
Troubleshooting Section
to solve possible
electrical problems.
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