You can search for vacuum leaks by squirting some of your starting fluid on the carb base and the intake to head gasket while the engine is running. Any change in engine speed means a leak. Some fuel leakage on carb my go away when the gaskets soak up some moisture after sitting dry for so long. When you are changing the fuel pump bolt out the lines. A filter between your new pump and the tank might save it.

"I wonder if God created man because he was disappointed in the monkey?" Mark Twain