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 - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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