Causes of Engine Fuel Injector Faults

Fuel injector faults may be caused by the following causes.

A little or no fuel injected.

Causes:

(1) There is air in the fuel supply system.

(2) Seizure of the fuel injector nozzle.

(3) Abnormal fuel supply from the fuel injection pump.

(4) Oil leak at high-pressure fuel pipes.

(5) Wear of fuel injector nozzles.

Correction

Prime the fuel system.

Let a professional serviceman check and replace the nozzle assembly.

Refer to fuel injection pump fault for troubleshooting.

Tighten the pipe locknut and replace the pipes with crack, make replacement if required.

Let a professional serviceman replace the nozzle assembly.

Too low fuel injection pressure.

Causes:

(1) Lose pressure regulating screw.

(2) Deformation or break of the pressure regulating spring.

(3) Seizure of needle valves.

Correction:

Let a professional serviceman readjust the screw to the defined pressure and tighten the locknut.

Let a professional serviceman replace the injector spring.

Let a professional serviceman replace the nozzle assembly.

Too high fuel injection pressure.

Causes:

(1) Pressure regulating spring force too high.

(2) Seizure of needle valves.

(3) Block of the injection holes.

Correction:

Let a professional serviceman readjust the spring force.

Let a professional serviceman replace the nozzle assembly.

Let a professional serviceman check and clean the injection holes. Replace the injector if necessary.

Fuel leak at fuel injector.

Causes:

(1) Break of pressure regulating springs.

(2) Damage of needle valve facing.

(3) Seizure of needle valves.

(4) Deformation of tightening cap.

(5) Poor contact between nozzle and injector body.

Correction:

Let a professional serviceman replace springs.

Let a professional serviceman replace the nozzle assembly.

Let a professional serviceman replace the nozzle assembly.

Let a professional serviceman replace the caps.

Let a professional serviceman repair or replace the nozzle assembly. Replace the injector if required.

Poor fuel atomization

Causes:

(1) decay of pressure regulating spring force or break of springs.

(2) Wear of fuel injector nozzle seat surface.

(3) There is impurity on the fitting plane of fuel injector nozzle assembly.

(4) Deformation or wear of nozzle assembly.

(5) Seizure of needle valve.

Correction:

Let a professional serviceman replace the springs.

Let a professional serviceman repair or replace the nozzle assembly.

Let a professional serviceman clean the nozzles.

Let a professional serviceman replace the nozzle assembly.

Let a professional serviceman replace the nozzle assembly.

Fuel spray in kine or fuel dripping.

Causes:

(1) carbon deposit at nozzle holes and block of injection holes.

(2) Wear of needle valve seat surface.

(3) Seizure of needle valve.

Correction:

Let a professional serviceman clean the injection holes. Replace the nozzle assembly if necessary.

Let a professional serviceman replace the nozzle assembly.

Let a professional serviceman replace the nozzle assembly.

The surface of needle valve is burn or in blue-black.

Causes:

The engine is overheating

Hope it is useful to you

Correction:

Check the cooling system and do not over-load the engine for a long time. Let a professional serviceman check the nozzle assembly and make replacement if necessary.

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