2011 Arctic Cat 450/550/650/700/1000 ATV Service Manual, Page 173Get this manual
7Place the U-ring into the pump housingPosition the spring and diaphragm assembly (lip toward the carburetor) onto the carburetor; then secure the assembly with the pump housing and three screwsTighten securely
INSTALLING 1Connect the gas and vent hoses onto the carburetor2Connect the electric choke lead to the wiring harness
CAUTION
It is important to press down on the pump housing until it contacts the carburetor to make sure the diaphragm lip is properly seated in the groove in the carburetorIf the diaphragm is not properly seated, leakage will occur