|Replacing a Rochester Quadrajet needle & seat – diaphragm type.|
Our kit includes the small parts you see here:
Part #31, the diaphragm is replaced by a regular needle.
Some of the conventional seats have holes or ‘side windows’ whose purpose is to supplement fuel delivery past the float needle when it opens. On some of the seats the windows have been removed so that all of the fuel will discharge over the top of the needle/seat assembly.
Removal of the side windows improves operation of the float needle on some applications.