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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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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