No Gas to the Carb When Engine Warms Up

Money Pit said

1. I adjusted the float based on the recommednation of a previous post about my engine stalling (not enough fuel)
2. I took the cap off while the engine was idling, not driven.
The hard lines are the only thing that hasn't been replaced. I wonder if the gasket for the sending unit may be leaking. After I do a flow test, I'm going to blow air through the fuel lines and pressurize the tank.

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I wouldn't recommend doing that, You could easily blow the screen off the pick-up if You're not careful, and pressurizing the tank won't tell You anything related to the stalling.
The gasket for the sender can leak all day long, the only thing it will do is kill Your MPG & stink up the garage, it has no bearing on fuel supply.
Given the cap-off reply, If You can get it to run dry/near dry, I'd try removing it and observe what results that produces w/a helper,(& maybe a portable jump pack).