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Message: <blockquote data-quote="Tango-Charlie" data-source="post: 128086" data-attributes="member: 13263"><p>I support your theory.  I had an IH 656 tractor that was doing the same thing.  After several frustrating hours of troubleshooting I found that there was a piece of rust in the tank that would work its way around the tank and block the tank outlet.  I had actually back blew some air through the lines and it ran great again until the outlet got blocked again.  I had to remove the tank and clean it out and the problem never came back.  In my case I could actually see the junk on the bottom of the tank causing the problem before I cleaned it out.  Good luck and keep us posted if that is what happened.</p></blockquote><p></p>