Operation and Maintenance Manual forWP10 Series Four-valve Diesel Engine (China IV, V)
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Turn the ignition key to starting position, and check whether the starter motoris working (with other causes having
been excluded).
(2) Common rail pressure build up failure (the starter motor can properly function, but the engine cannot be
started)
◆Check if the fuel level in the fuel tank is too low.
Special attention must be paid to this cause although it tends to be overlooked.
◆ Check if the hand pump is functioning properly.
Operate the hand pump with hand to check the working condition.
◆ Check whether there is air in the low pressure fuel line, and remove the air if any (Leakage of the low pressure
fuel line is sometimes not noticeable, so careful inspection is required).
Air removal method: it is mainly to remove the air in the primary fuel filter. Loosen the bleed screw on the
primary fuel filter, and manually operate the hand pump on the primary filter until fuel flows out continually from
the bleed screw.
If the diesel engine still fails to be started after the air in low pressure fuel line is removed, there mightbe air in
high pressure fuel line. Remove the air in the high pressure fuel line.
Air removal method: loosen the high pressure fuel line of a cylinder, and drive the diesel engine to run with the
starter motor until fuel flows out continually from the high pressure fuel line. (It is recommended not to frequently
Hollow bolt for
fuel return
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