My motor went awhile without running. It's used as a kicker. Now it won't start. Checked spark (good), changed gas no luck. Removed and cleaned carb. and noticed bowl was empty. Filled the bulb and installed the carb, engine ran fine until the bowl emptied then it died. The fuel to the pump is unrestricted. Is the pump bad. It runs good until the bowl empties. I didn't see any obvious defects in the pump diaphram. <br />Any help would be reatly appreciated. thanks