Restorer32 Posted July 9, 2015 Share Posted July 9, 2015 1954 Cadillac Rochester 4G carb. Car runs fine until you tramp down the accelerator at which point it stumbles. Upon disassembly we find that the supposedly alcohol resistant accelerator pump cup has turned itself almost inside out. We have replaced the cup 3 times, same result. All adjustments are as specified and the car runs great until that cup partially inverts, always on quick acceleration. Same result with or without the reinforcing spring in place. Anyone else had this problem? Any ideas? Link to comment Share on other sites More sharing options...
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