Engine Hard to Start or Will Not Start (Exhaust Smoke Present)

Cause	Correction
Incorrect Starting Procedure	Refer to “The Starting Procedure Matrix“.
OK
Engine Cranking Speed too Slow	Check Engine cranking RPM. Refer to “Engine Will Not Crank or Cranks Slowly“.
OK
Starting Aid Needed for Cold Weather	Check/ repair or replace cold starting aid, if necessary.
OK
Air in the Fuel System	Bleed fuel system and check for suction leaks.
OK
Fuel Supply Restricted	Clean or replace pre-filters and screens, check for fuel line restrictions.
OK
Fuel Drain Back	Verify fuel return line is plumbed to the bottom of the fuel tank.
OK
Malfunctioning Fuel Return Overflow Valve	Check / replace fuel return overflow valve.
OK
Fuel Transfer Pump Malfunctioning	Check / replace fuel transfer pump.
OK
Intake Air System Restricted	Check intake air system.
OK
Fuel Contaminated	Verify by operating engine from a temporary supply tank.
OK
Injection Pump Timing Incorrect	Check injection pump timing.
OK
Valves incorrectly adjusted	Adjust valves.
OK
One or more Injectors Worn or Malfunctioning	Check / replace injectors.

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