All JD Roosa pumps,C, B, and JDB&JDC originally came with shims behind the leaf spring to limit the max fuel setting. There are also 4 leaf spring sizes, each one allows more shoe travel. Parts can be changed to get more fuel in all pumps, but must be torn down to access the leaf spring to see what is in place now. The shims kept the fuel from being turned up externally, most are removed at rebuild time. The C pump can get what you need with the right parts.
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