My engine model is 1258V9B, model B, and the parts picture online shows it has a booster spring in fuel pump 1st stage, but mine does not have a spring. The Clymers repair manual doesnt show a spring. Should I buy one and put it in? The pump and carbs were repaired by a local shop last year and now it runs for about an hour then starts bogging down. It perks up when I pump the bulb. This happens with the main tank and with a temporary tank. Should I look for air leaks around the carbs?
