If I read your post correctly, it reads the pump linkage is loose at idle. This is not good, it should have no looseness, and should move, squirt fuel, with the slightest movement of the throttle plates.
Usually the pump cam, the plastic piece the linkage rubs on the throttle lever, is screwed to Pos 1 and the top hole of the cam itself.
You may have to remove the pump linkage and bend it to fit.
The proper method to adjust the pump linkage is to have an assist hold the pedal to the floor, then adjust for .015" clearance between the pump lever and the diaphargm arm at max stroke. The pump lever is the actuator for the diaphargm in the bowl. Push down on this with your finger, and adjust the clearance between the spring-loaded screw and this same short arm to .014-.017 inch.
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