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Hello, my name is***** will assist you.
The one thing that you have not done is the lines themselves. They can and do fail internally and this will cause this type of problem.
Run the engine on a separate fuel source. See if the problem is still there. If so, it may not be the fuel system, but in the carb.
Ok, please remember that I am not there to see what all you have or have not done. I start with the easier stuff to not over look anything.
Install an inline gauge after the fuel pump, start the engine. Watch the gauge as you increase the RPM on the engine, if it does not raise to between 4-6 PSI, replace the pump.