I have a 8640 that the check valve is located on the filter housing. They are always going out. You may have to replace the primer pump. Where the hand pump is mounted, that's a fuel pump. You take the lines off and remove the two nuts and take it off. I had that go bad on me this summer. When you are hand priming you should hear the fuel returning to the tank if you have flow.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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