A Volkswagen friend in England recently e-messaged me about a situation with his carburetor. His is a 28 Pict-1 but the situation is identical to that of the 30 Pict-1 carburetor.
The proposed problem deals with the Main Jet of the carburetor.
When my friend experienced some carb problems, he began to search the Internet for helps. He discovered a video and watched it and followed the instructions.
When the video came to the Main Jet installation, the mechanic pointedly explained that the hole in the Main Jet Carrier Bolt should align with the hole in the bowl of the carburetor.
My friend attempted to get the holes to align but was unable to do so. Now, he thought that he had a problem. He asked me if he should not tighten the Carrier Bolt, but leave it a little loose so that the holes would align.
By not tightening the Main Jet Carrier Bolt, gasoline will seep to the outside of the carburetor, resulting in the problem of raw gasoline in the engine compartment—a problem which none of us wants.
In the Carburetors mentioned above, the brass Main Jet Carrier Bolt also serves as the Plug for the bottom of the Carburetor Bowl. (Later carburetors have a simple steel or brass Bowl Plug. The Main Jet was separated from the Carrier Bolt and moved to a new location but has the same function).
With the Main Jet Carrier Bolt in hand, note that the area which has the holes is recessed—of a smaller diameter than the rest of the Bolt. There are three holes drilled on opposite sides of one another. This is so that gasoline can pass through the hole in the bottom of the Carburetor Bowl and enter the recessed area where the Main Jet Carrier Bolt resides. With the Main Jet Carrier Bolt installed, gasoline in the Bowl can freely circulate around the Carrier Bolt and enter the 3 drillings in order to pass to the Main Jet.