Has anyone any tips on how to prime and bleed air from the diesel fuel supply on my 3b bj42? After a necessary head off job I am having great difficulty in bleeding all the air from the fuel system. I have rigged up a small tank and fed the fuel directly into the fuel pump and successfully bled the air at the fuel filter. She starts and runs fine. Syphoning fuel , ( gulp ), by mouth, from the tank and connecting it to the fuel pump also allowed it to start and run. However, next day, it wouldn't start. Going through the same procedure again gave the same successful result. Once again , next day, no joy. With my small header tank sited above the level of the injectors I notice a small leakage of fuel around each injector. Could this be where air is entering overnight? And if so am I missing some washers on the injectors ( I only used copper washers ). Has anyone tried installing an electric fuel pump after the sedimentor? Any tips anyone?
3b diesel priming problem
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Posting in the diesel section might help.
However, you should have no leakage around the injectors. That is definitely not right. Also, the stock hand primer is known to fail and can allow air into the system. The Bosch replacement (I can't remember the part number, but it's posted in several places in the diesel section of Mud) is a great upgrade.
When I had to bleed mine, I would prime it with the hand primer and crack each injector line until I started seeing fuel. Tighten down the fitting and try starting it up. Once running, I would again crack each injector line and let the air bleed out. Once the idle smooths out, you know you have the air out of the lines.
Good luck!
However, you should have no leakage around the injectors. That is definitely not right. Also, the stock hand primer is known to fail and can allow air into the system. The Bosch replacement (I can't remember the part number, but it's posted in several places in the diesel section of Mud) is a great upgrade.
When I had to bleed mine, I would prime it with the hand primer and crack each injector line until I started seeing fuel. Tighten down the fitting and try starting it up. Once running, I would again crack each injector line and let the air bleed out. Once the idle smooths out, you know you have the air out of the lines.
Good luck!
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Change your fuel filter, crank your injectors down to the right foot pounds this is critical for milage !
* Being out just one pound can lead to sh*t milage.
use the bleed screw with a hose into a pop bottle so you can watch the fuel go from air and fuel to straight fuel by pumping the primer pump !
If you have fuel escaping from the primer pump you will need a replacement pump, Bosch has one.
Check for any fuel leakage along the fuel lines around the motor back to the tank.
Adding a fuel pump will do nothing as your diesel won't run with any small amount of air in the system.
* Being out just one pound can lead to sh*t milage.
use the bleed screw with a hose into a pop bottle so you can watch the fuel go from air and fuel to straight fuel by pumping the primer pump !
If you have fuel escaping from the primer pump you will need a replacement pump, Bosch has one.
Check for any fuel leakage along the fuel lines around the motor back to the tank.
Adding a fuel pump will do nothing as your diesel won't run with any small amount of air in the system.
