Join Date: Jul 2006
Location: Northfield, Illinois
Do NOT apply force! Bad things WILL happen. Spray liberal Gumout choke and carb cleaner in the slot of the spring retaining brass clip. Wait 24 hours. Push down with thumb pressure on the pump rod. It probably wont move. Then GENTLY tap DOWN on the rod witha light plastic or brass hammer. While doing this, hold the butterfly plates as open as possible EASILY. Avoid any force. The piston may sloghtly loosen at this point. Try to pull up on the rod. If the piston begins to move, spray more Gumout and let it sit overnight again. Eventually, it will move if you are patient. You will still need to completely remove the piston, rod, spring and retainer and clean, plus clean the cylinder bore.
It is also likely there is more gum partially or completely blocking the "catacomb" passages under the Weber that feed the pump circuit and the starter circuit. There are more complicated tricks to fix these. Unless you are familiar with Weber repair, you may be well of sending them to a known good Weber specialist. Many of the Webers I restore have SERIOUS damage caused by well intentioned DIY repair. This can be a costly lesson. Ruining good italian made Webers is not an option as new Italian replacements don't exist, and parts can be costly.
From my experience.
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