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 - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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