You can see in the video, I used needle nose vise grip with just slight enough pressure to restrict the line...not completely clamped....took a few attempts but started quickly and much faster that bleeding all the lines.
Clamping off the return fuel line on a diesel engine can help force air into the injectors and clear air out of the fuel system. However, it's important to note that this procedure should be done with caution and only as a temporary measure for bleeding air from the system. Fully closing the return line can cause excessive pressure in the fuel system, leading to potential damage to components.
Here's a step-by-step explanation of how this process works:
Understanding the Fuel System: Diesel engines typically have a fuel supply line that sends fuel from the fuel tank to the injectors through a high-pressure fuel pump. After the fuel passes through the injectors, any excess fuel or air bubbles are returned to the fuel tank via the return fuel line.
Air in the Fuel System: Sometimes, air can get trapped in the fuel system due to various reasons such as changing fuel filters, running out of fuel, or a leak in the fuel system. When there is air in the fuel lines, it can prevent proper fuel delivery to the injectors, leading to rough running or even stalling of the engine.
Partial Clamping of the Return Line: By slightly clamping off (partially closing) the return fuel line, you restrict the flow of excess fuel and air back to the fuel tank. As a result, the pressure in the fuel system increases, and the air that is trapped in the fuel system is forced towards the injectors.
Starting the Tractor: With the return line partially clamped, start the tractor. The increased pressure in the fuel system helps to push the air bubbles towards the injectors. The engine will run rough or may even stall during this process, but it helps to evacuate air from the system.
Bleeding Air: As the engine runs and fuel circulates through the system, air bubbles will eventually be pushed out through the injectors and into the combustion chamber, where they are burned off harmlessly. At the same time, fuel flow to the injectors is improved as air is removed from the fuel lines.
Removing the Clamp: Once the engine is running smoothly, carefully remove the clamp from the return fuel line. This will restore the normal fuel flow and pressure regulation in the system. The air should now be effectively purged from the fuel system.
Check for Leaks: After completing the procedure, it's important to check the fuel system for any leaks or irregularities. Ensure that the fuel lines and connections are secure and that there are no signs of fuel leakage.
Remember, this procedure should only be used as a temporary measure for bleeding air from the system. If you regularly encounter air in the fuel system, it's essential to identify and fix the root cause of the issue, which may require professional inspection and maintenance. Always follow the manufacturer's recommendations and guidelines when working on your tractor or any other machinery to avoid potential damage or injury.
