| Cause |
Correction |
| Engine is cold |
Allow the engine to warm up to
operating temperature. If engine will not reach operating
temperature refer to manual |
| Idle speed is set too low for
accessories |
Check and adjust the low idle
screw |
| Engine mounts are over tightened,
damaged, or loose |
Verify the condition of the mounts.
Refer to the equipment mfger's service instructions. |
| High pressure fuel leaks |
Inspect the high pressure lines,
fittings, or delivery valve seals and repair if necessary |
| Air in the fuel System |
Bleed the fuel system and check
for suction leaks. |
| Malfunctioning fuel return overflow
valve |
Check/replace the return overflow
valve |
| Fuel transfer pump malfunctioning |
Check/replace the fuel transfer
pump |
| Fuel supply restricted |
Clean the pre-filters and screens
and check the fuel line for restrictions. |
| Valves incorrectly adjusted (valves
are not sealing) |
Check and adjust the valves |
| Engine Compression is low |
Perform the compression check
to identify the malfunction |
| Injector needle valve sticking |
Check the injectors and replace
any malfunctioning injectors. |
| Fuel injection pump malfunction/delivery
valves malfunctioning. |
Remove the fuel injection pump
and repair or replace as necessary |
