To check if fuel is being supplied to the injectors if there are starting difficulties, loosen the union nuts at two injectors and, without turning on the glow plugs, start the engine until fuel appears at the union nuts. Then tighten the union nuts to 20 Nm and start the engine in accordance with the operating manual.
Caution: When air in the fuel system is not automatically removed, the following measures must be taken:
When working with the injection system keep clean.
Make sure that diesel fuel does not come into contact with the coolant hoses. If necessary, wipe the hoses immediately. Replace damaged hoses.
Press the clamp and disconnect the fuel supply line "3" from the fuel filter to the high-pressure fuel pump. Collect and remove the leaking fuel without harming the environment.
Insert a suitable hose into the threaded hole and lower the other end into the vessel.
Remove the fuel pump relay and connect the terminals on the relay base with a jumper so that the pump could supply fuel.
If fuel leaks into the container, remove the jumper and put the relay back in place.
Connect the fuel supply line, having previously lubricated the seals with technical petroleum jelly or acid-free grease. Replace damaged seals. Secure the line with a clamp.
Loosen plug "1" on the high-pressure fuel pump by 2 turns.
Turn the engine crankshaft with the starter until fuel comes out of the hole in the pump. Collect the leaked fuel.
Screw plug "1" back into place and tighten to a torque of 25 Nm.
Loosen the mounting bolts and remove the intake manifold trim covers.
Loosen all union nuts of the fuel lines at the injectors with a special key, for example, HAZET 4550. Turn the engine crankshaft with the starter until fuel comes out from under the nuts. Then tighten the union nuts to a torque of 20 Nm. If leaks are detected, tighten the nuts to a torque of 25 Nm. This quickly removes air from the fuel lines of the fuel system.
Carefully remove any fuel that has leaked into the engine compartment.
Install the engine trim covers in place.