Check the rubber hoses at the tank and before the pump. Could be rotted and cracked. Look the pump over for leaks, there is a vent hole, if it's wet, the diaphragm is leaking. Take the fuel line off the carb, slip on a section of rubber hose, direct it in a container and start it up, see what kind of flow you have. Should give a full stream pulse every time the pump cycles. If there is not a return line, the pump should hold pressure once it's shut off.
If the flow volume is low or blowing air, that's a sign of cracked hoses, sucking air somewhere, restriction in the pick-up sock, or bad pump diaphragm.
If the pressure is low, that's a sign of a bad pump.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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