Forward/reverse cable is typically a 43BC not 33C. 43 is larger diameter. "B" signifies "bulkhead connector" at one end and "C" indicates "clamp connector" at the other. Bulkhead connector is needed at the pump. It secures the cable in the bracket with 2 nuts. The clamp end is for the control end of the cable. You have the wrong cable for your application.
The 33C cables are generally used for throttle cables.