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Air in fuel lines

A

Anonymous-0

Well-known Member
I have an ignorance question on diesel. I was raised with gas so don't know much about diesels. I have a 684 IH. Runs great for about 30 minutes at PTO speed. After that it will die. After a lot of inspection it seems there is air in the fuel line. The lines at the pump have no fuel. The fuel filters are about half empty. If I loose the lines at the pump and turn the motor over until fuel is present it will run for another 30 minutes or so. I noticed that one of the bleed screws on top of the no. 1 fuel filter will not completely tighten down. Seems to be stripped. Can this allow enough air to get into the lines to cause this problem? The screw is snug but not tight. No fuel leaking or bubbles but definatley stripped. Any other ideas
 
Sounds like the line from the tank is plugged. Blow it out backwards. How is the tank vented ? Thought the cap or a dedicated vent. Try running with the cap off if the line from the tank freely flows fuel.
 
I have already blown the line out back into the tank. Also replaced the cross over line. This taractor has a split fuel tank. Will dtry running witht he cap off.
Thanks
 
This tractor has a filter at the shutoff valve in the fuel tank.This filter could be plugged with dirt.Had the same problem with a 684 a couple weeks ago.
 
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