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 - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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