How to bleed a diesel fuel injection system?
Gain access to the injector tops and fuel lines. Some engines have their injectors exposed, while others mount the injectors under the valve cover. Remove the valve cover if applicable. Ensure that the fuel cutoff valve is open. Break the torque with a wrench on the fuel bolt of the last injector in the series to get fuel.
How do you remove common rail injector from car?
First, open the box and fuse under the hood and pull out the fuel pump relay. This is to ensure that diesel fuel is not flooded the engine and the floor if you suddenly need to turn on the ignition. Then disconnect the electrical connectors nozzles.
Where does the fuel go in a diesel injector?
A diesel fuel injector’s job is to carry fuel from the lift pump to the fuel gallery. While doing this, some fuel is sent to the combustion chambers. Excess fuel is used to cool down the injector lines and it goes back into the fuel tank. There can be an introduction of air bubbles during this whole process though…
Where is the bleed screw in the fuel line?
The fuel system’s secondary or on-engine fuel filter is located between the lift pump and the high-pressure injection pump, and it’s here that air often becomes trapped. Most secondary fuel filters are equipped with a bleed screw.
What to do when your diesel engine starts to bleed?
Loosen injection lines at the injectors about one turn. The use of two wrenches will prevent the binding or twisting of the steel lines. Usually, it is enough to bleed just half of the lines at a time. 12. Crank the engine until all air is forced out and fuel is present. 13. Engine will start to pop on one or two cylinders. 14.
How do you fix a bleed plug in a fuel pump?
Most all equipment has a hand priming pump lever to pump fuel through the system and replace trapped air. (Check operator’s manual.) Pump several times until full flow, without air bubbles, escapes from the bleed plug holes. 8. You may need to bleed filters, fuel pump and lines to the injectors.
Is it necessary to loosen metal injection pipes on diesel engines?
Don’t loosen metal diesel injection pipes on common rail engines to bleed, it is not necessary and they run at very high pressures (up to1600 bar) and may not reseal without new pipes.
Why does the diesel weep out of the injectors?
The diesel only weeps out of a cracked pipe union that feeds each injector and i’ve also cracked the outlet pipe from the HP pump and it too only weeps diesel on the starter motor.
What happens when you bleed the injector pump?
When you tip the engine over, fuel will start pouring from the last injector that you took off the bolt from. Observe air bubbles while the fuel falls to the ground. As soon as you notice a smooth fuel flow without air bubbles, use a wrench to put back the bolt tightly on the last fuel injector. You have successfully bled the injector pump.
When to use manual bleeding of fuel lines?
No manual bleeding of fuel lines is required. NOTE: Manual bleeding is required if: The fuel filter is not filled prior to installation. Injection pump is replaced. High pressure fuel line connections are loosened or lines replaced. Initial engine start up or start up after an extended period of no engine operation.
When to close bleed plugs on diesel engine?
Close bleed plugs after all air is removed from the fuel tank, filters, settlement bulb, and fuel pump (only one at a time working through all bleed screws beginning closest to tank and ending at nozzles if necessary). 10. Try the engine; if it doesn’t start or runs poorly, you may have to bleed the injection
When to bleed a diesel fuel injector line?
In extreme cases additional injector lines may need to be loosened until air is bled. When engine runs smoothly you have successfully bled the fuel system. After your job is done, cleaning up is really important again to avoid accidents and injury from the fuel on the ground.
What causes a diesel engine to bleed air?
When you change a diesel fuel filter, run out of fuel or disturb the fuel system, air is trapped. When you try to start the engine this air acts as a lock, preventing the normal supply of fuel into the cylinder. Here are the steps to take in bleeding air from a diesel fuel system: 1. Turn off fuel valve.
What to do when fuel comes out of injector?
Loosen line connected to injector, and cover with a shop cloth. Rotate engine using starter until fuel comes out of loosened line. Tighten line and turn over engine with starter again. It should start and possibly run roughly for a few seconds as all the air bleeds out of fuel system.