Sounds like you have a system that is very similiar to the OEM Cockshutt LP setup.
Cockshutt was one of the very few companies that used the primer setup. I have a 40 that came off the line factory. What is happening when you push the primer button is the low side regulator is being opened. Thusly letting low pressure gas into the intake stream.
Pretty much everybody else felt the need to have a choke and if the OP's Case is factory it has a ensign system with a choke or starting circuit.
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