Removal air from the fuel system
A – deaerator, P – manual fuel pump button, V – sump mounting bolt
This procedure must be carried out in the following cases:
- disconnecting the fuel line;
- air lock in the fuel pump fuel circuit;
- engine shutdown when there is no fuel in the fuel tank;
- replacing the fuel filter.
1. Loosen the fastening of the deaerator (A) of the filter and the bolt (5 – see Fig. Fuel injection system) couplings of the fuel supply line to the fuel pump.
2. Place a container under the deaerator and the pipeline coupling.
3. On engines equipped with a manual fuel pump with a shaped polygonal head, unscrew the head of the manual fuel pump.
4. Press the hand pump button until the fuel flowing out of the deaerator does not contain air bubbles.
5. Tighten the fuel filter deaerator.
6. Press the hand pump button until the fuel flowing out from under the coupling bolt of the loose fuel supply line to the fuel pump does not contain air bubbles and immediately tighten the coupling bolt of this line.
7. Stop the fuel supply when the pump button begins to offer strong resistance. On engines equipped with a manual fuel pump with a shaped head, tighten the fuel pump head by hand.
8. If the injection pipes have been replaced (or unscrewed), loosen the nuts that secure them to the injectors, press the accelerator pedal all the way down and turn on the starter until fuel starts to flow out from under the pipes with the loosened fastening.
9. Screw the fuel supply lines to the injectors and start the engine.
10. Check the tightness of all fuel line connections.