Many people mistakenly believe that to pump fuel, you need to pump the pump, unscrew the plug and that's it. However, in the presence of a defect or in the absence of pumping sediment, such an operation will not work. Let's consider how to bleed the fuel system of a diesel engine.
Instructions
Step 1
Loosen the "return" bolt on the high-pressure fuel pump (injection pump) itself, most often such a bolt is a bolt 17, on which there is a mark "out". However, there are other overlays, so be careful. For example, on Nissan, this is a bolt not on 17, but on 19. Carefully study the device and instructions for your particular car brand.
Step 2
Make sure that the fuel starts flowing without bubbles, then you can finish pumping. If the bubbles do not stop, then look for suction. Remember that the engine will start only when there are no air bubbles in the injection pump at all.
Step 3
If the booster pump is rather weak, or the valve's tightness is broken, then try to pump air using a simple car pump, after removing the hose from the injection pump. These actions will create pressure in the tank, which pumps fuel, and then enters the fuel pump. Here you will also need an adapter that tightly closes the "return" hose. For example, do it with a compressor, but be careful not to swell the fuel tank.
Step 4
Unscrew the tubes that are connected to the nozzles. They contain residual air, so rotate the crankshaft by hand to fill them or use the starter to fill them. Remember to apply voltage to the fuel cut-off valve. First, try to pierce the air by rotating the stator without disconnecting the tubes, but this is fraught with a complete discharge of the battery, so it is still better to remove the tubes.
Step 5
After a trickle of fuel appears, carefully screw the tubes back into place. Tidy up the place of work, close the hood. Remember that in this way you will not only easily start the engine, but also keep the battery, fuel pump and starter in working order.
