re: Losing pressure in primer bulb mid WOT

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ethanol (E10 gas...of which 90% of all gas on the market is E10) is dissolving the fuel line. well-known problem and that is a primary symptom as the decomposition gets hung up on the valve and/or fuel filter causing the fuel line to lose siphon/pressure. buy a new ethanol resistant fuel line (all the major manufacturers have one) and replace the entire thing...hose, bulb, filter and fittings. your problem should clear up.

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Yep, E10 fuel will delaminate fuel lines. Sill, you are getting air in anywhere from the motor back to the fuel tank for the primer ball to expand back. Also, you need to check the fuel pick up line inside the tank. Some times they will leak right at the 90 fitting inside the tank. Air will get in there too!