Depending on the exact model of the carb, you can sometimes purchase just the parts for the pump, or it will come with a complete rebuild kit.

Putting it bluntly? If the accel. pump has gone bad? (easy to verify, look down the throat of the carb with the engine off and move the throttle linkage to wide open--you should see and smell raw fuel being sprayed right into the throat.) At any rate--If the pump has gone bad? Might just as well rebuild the carb with all new parts. Most of these items come complete in the "Kit", but be aware--the float can be either brass or a black plastic type material. I normally replace the float at the same time a rebuild is done.

S-