I have a similar problem. Bulb is between engine and filter.
Had an old bulb and it was in bad shape, replaced bulb and fuel lines put bulb out of sun in compartment.
Engine always starts fine but as the day goes on and it gets hot out I start having trouble. If I forget to pump the bulb later in the day, after I start up engine will die. Ask Gasper Master about this, he can tell you about hitting the deck Saturday.
The bulb seems to get air in it. Maybe an air leak somewhere?
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