"Terry Cox" wrote in message
...

I just purchased an old Ariens lawn mower today at a yard sale with a
Tecumseh 5 Hp engine. My husband got it started, but it won't
continue to run without pushing the primer button.

You've answered your own question. When you push the primer button it pumps
fuel into the carburetor. So it is likely not getting enough gas.
Check for blockages in the tank and line. Pull the carb, disassemble and
clean it. Fill with fresh fuel.

Barren