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I haven't had the collapsed bulb problem since switching to a new Mercury bulb, replaced the fuel line from the tank and added a filter/separator, and new fuel with stabil in July. The only thing I haven't done is the tank's fuel pickup.

The new 1/2" fuel line is difficult to remove from any fitting except the bulb so I don't think there is a line air leak.

Looks like tomorrow's project is pulling the tank's fuel pick up.

Thanks for the suggestions.