I'm not familiar with that setup. Mine has a pickup in the stern end of tank. It is a hard plastic tube reaching just short of the bottom of tank.
Your tube lays on the bottom of tank reaching all the way to the back? There are no baffles in the tank? Could the tube be sucking up against a wall randomly?
I know you can't test it because it is intermittent but if it were happening, opening the fuel filler cap would rule out the vent...with a big sucking sound...
you said the primer ball sucks in... like a deflated football? Brady-Belichek syndrome...move to New England, it will be fine....
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