Caution! Before removing fuel hoses and pipes, clean them with cold cleaner.
Cause | Method of elimination |
The engine does not start, it starts poorly | |
| Preheating does not work | Check the preheating system. |
| There is no voltage supplied to the fuel shut-off valve | Connect a voltage tester to the valve, turn on the ignition. The LED should light up, otherwise find and fix the broken wire. |
| Defective fuel shut-off valve | Check the reliability of the fastening and ground connection of the fuel shut-off valve. Turn the ignition on and off, and you should hear the valve clicking. |
| Fuel system failure | Check the fuel supply. Clean the fuel lines. Replace the fuel filter. Clean it out. |
| Injector defect | Check the injectors by loosening the union nuts one by one and checking that the cylinders are working. |
| High pressure fuel pump defective | For testing, install a known good pump. |
| The engine runs unevenly at idle and when starting to move | The fuel hoses are not secured to the fuel pump or fuel filter. Replace fuel hoses, tighten clamps, hollow screws. |
Increased fuel consumption | |
| The air filter is dirty | Replace the air filter element. |
| Leaks in the fuel system | Perform a visual inspection of the entire fuel line, fuel filter and high pressure fuel pump. |
| The fuel return line is clogged | Blow air through the fuel return line from the high pressure fuel pump to the fuel tank. Replace the overflow orifice in the hollow screw of the fuel return pipe. |
| Increased idle speed | Adjust the idle speed. |
The pre-glow indicator lamp does not light | |
| Defective control lamp on the instrument panel | Replace the lamp. |
| Glow plug defect | Check the glow plugs. |
The preheating indicator light does not come on, and the cold engine is difficult to start | |
| Defective one or more glow plugs | Check and possibly replace glow plugs. |