Remove each wire, one at a time and replace with the same size wire to the same terminals.
Keep at it until all wires are replaced.
This breaks the wiring down into small pieces rather than the large wiring loom.
There are cheap Chinese carburetors on Ebay for about $30 and they do seem to work.
The fuel pump is in the carburetor so a new one should be looked at.
Replace all fuel lines from the tank to the carburetor.
There is also a hose inside the tank to pickup fuel.
Change that too.
Make sure inside...