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. . The primer pump bulb is sucking shut again, so got to do some more investgating....
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That means there is a flow restriction UPSTREAM of the primer bulb, like a plugged filter, plugged screen on fuel pickup in the tank, plugged elbow, etc. Sounds like maybe the "ethanol-fuel-cleaning-out-tank disease! 
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Check the anti siphon valve on the tank. You can remove it and change it or just leave it off.