TROUBLESHOOTING
TESTING AND ADJUSTING 8. ENGINE STALL AT LOW RPM
Cause:
Correction:
Fuel Pressure is Low
Make sure there is fuel in the fuel tank. Look for leaks or bad bends in the fuel line between fuel tank and fuel transfer pump. Look for air in the fuel system, sticking, binding or defective fuel bypass valve. Check fuel pressure. The outlet pressure of the fuel transfer pump must be a minimum of 415 kPa (60 psi) at full load speed. The pressure in both fuel manifolds must be 415 to 450 kPa (60 to 65 psi). If fuel pressure is lower than the above pressure, install new filters. If fuel pressure is still low, check the fuel transfer pump and fuel pressure regulator valve in the fuel manifold.
Idle rpm Too Low
Make adjustment to governor so idle rpm is the same as given in the FUEL SETTING AND RELATED INFORMATION FICHE.
Engine Accessories
Check engine accessories for damage and correct adjustment. If necessary, disconnect the accessories and test the engine.
Defect in Fuel Injector(s)
Make Reference to Item 7.
9. NOT ENOUGH POWER Cause:
Correction:
Dirty Fuel Filters
Install new fuel filters.
Bad Quality Fuel or Water in Fuel
Remove the fuel from the fuel tank. Install new fuel filters. Put a good grade of clean fuel in the fuel tank.
Fuel Temperature is High
Excess fuel flow temperature should be 65.6 to 82.2àC (160 to 180àF). If excess fuel flow temperature exceeds 82.2àC ( 180àF), the use of a fuel cooler is recommended to prevent excessive engine power loss and to maintain an acceptable injector life.
Fuel Pressure is Low
Make sure there is fuel in the fuel tank. Look for leaks or bad bends in the fuel line between fuel tank and fuel transfer pump. Look for air in the fuel system, sticking, binding or defective fuel bypass valve. Check fuel pressure. The outlet pressure of the fuel transfer pump must be a minimum of 415 kPa (60 psi) at full load speed. The pressure in both fuel manifolds must be 415 to 450 kPa (60 to 65 psi). If fuel pressure is lower than the above pressure, install new filters. If fuel pressure is still low, check the fuel transfer pump and fuel pressure regulator valve in the fuel manifold. (Cont. next page)
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