First off, dump in a couple of Cans of Sea Foam, I use that SH on everything.
Have you pulled a couple of plugs and checked how much spark you have when it is hot? If spark is weak, first replace the plug wires. As they get old and hot they can breakdown. Next check the coil or capacitor depending on ignition type. They often work fine cold but lose a little zap when old and hot.
I get from what you are posting the using the hand pump is not helping to start the engine hot. Make sure the choke butterfly is open all the way when the choke is off. If spark is good have you tried squirting gas into the carb throats to see if priming it starts the motor right away. If it does you have fuel starvation. Is the vent on your tank open or if built in is it actually venting properly. Next check your fuel line to see if it is old and collapsing thereby cutting off fuel. Next step is to check your fuel pump, followed by carburetor seals, floats varnish etc.
If you have spark and fuel they pretty much will run.
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