Almost sounds more like your float level is too low or your check ball is missing. Does your carburetor have the plunger with the flat post, slotted for the hook from the throttle linkage, or is it a round rod bent at a 90 at the top that goes in a hole in the throttle linkage and held with a clip?
The return spring goes under the plunger. The actuator spring goes above the plunger and does the moving of the plunger. The linkage from the throttle does not push the plunger down. If it has the slot/hook type, the hook drops and the spring pushes the plunger down. If it is the rod type, the linkage pushed the rod down and again allows the spring to actuate the plunger. This provides a constant, steady stream of fuel.
I found the carb I have, but they utilized the 2 aforementioned styles. The carb kit comes with the parts to rebuild either style.
