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TM 5-4320-313-14
5-7. FUEL INJECTION PUMP - Continued.
a. Test. (Refer to figure 5-7).
NOTE
Perform this test before removal of injection pump and after installation.
Death or serious injury could occur if fuel is not handled carefully. Use in a well-ventilated area away
from open flame and arcing equipment. Do not smoke.
(1) Remove fuel pressure line injection pump (1) from injector. Install fuel shutoff clamp.
(2) Make sure the extra fuel device button is not pulled to the extended position If the button is extended, move the
throttle control hand lever to the stop position and then return the lever to the START position to reset the extra fuel
button.
(3) Connect testing device (2) to injection pump (1). Make sure side connections (3) are tightly locked.
(4) Install dial gauge (4) to testing device (2).
(5) Loosen the pressure gauge connection, and crank the engine until trapped air is removed from the system.
(6) Tighten pressure gauge connections.
The pressure gauge can be damaged if the engine is cranked beyond the gauge limits. Failure to heed
this caution can damage equipment.
(7) Slowly crank engine by hand. As the engine is cranked, read fuel injection pressure on the gauge. Injection
pressure should be 4351 to 5076 psi (300 to 350 bar). Stop cranking engine and observe whether pressure is
maintain. If pressure drops below 3650 psi (250 bar) within 10 to 15 seconds, then injection pump is not in working
order. Replace injection pump.
(8) Remove testing device (2) and dial gauge (4). Connect fuel pressure line to injector.
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