Fuel pump has internal valves and they are either deteriorated or there's a piece of crud holding them open. That lets fuel run back toward the fuel tank.
 
I had tank off cleaned it & screen.installed new fuel pump, & fuel line. I will take new pump apart & check it. Thanks for your reply.
 
You might have got a bad new pump.
You might want to check the gasket in the carburetor.
If it's bad the fuel can evaporate - that makes it a little worse.
 

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