Quantcast ENGINE STALL AT LOW RPM

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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.
Excess fuel flow temperature should be 65.6 to 82.2C (160 to
Fuel Temperature is High
180F).  If excess fuel flow temperature exceeds 82.2C (
180F), 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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