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I have to concede to mowerman2468, He is correct. I also missed that the return line might be broken or missing, as well as a cap. Yes, it's unfortunate the some carbs are not rebuildable, only...

Fuses are protection devices for specific circuits. They need NOT to be exceeded as far as amperage goes. They are wired in series and parallel circuits.

Relay more than likely isn't or wasn't the problem. The pump can draw enough amperage to overload the circuit, and pop a fuse, if defective. A grounded wire to the pump can also pop fuses. Another...

If you're lucky , it'd be one head gasket. If not, it could be both head gaskets, or a cracked head or block. Repair would be based on time and local shop rate.

Check for intake leaks which lean the mixture out and cause overheating. Check for debris in and around engine. If engine is equipped with an anti-afterfire solenoid, is it connected, and if so, is...

The diaphragm is most likely ruptured under that cover. The carb needs to have a kit put in it.