Fuel line problem

Any sign of fuel stains at the carb??
The accel. pump on the Solex has two rubber gaskets with an alum. plate between them. On one of my cars, someone overtightened the screws and warped the plate. After one or two days there was no gas in the carb!

Check the fuel pickup line at the gas tank for a loose connection. This will let air in and the pump has to work like mad to get fuel up to the carb.

Missing fuel

Is the fuel in the bowl going away when the engine is HOT and cools, or will it vanish if you just start up and shut it down right away?
What is probably happening, is the fuel, sitting in the HOT carburator bowl from the hot manifold, expands, and overflows into the intake manifold. Then, on cooling, the fuel leval in the bowl is now lower than with the hot engine running.
When you try to start from cool, the vacuum from the engine, or vibration from starting, causes the needle, possibly stuck from overflowing, to drop, allowing the pump to refill the bowl.
Try replacing the needle and seat, and checking the float leval and drop. Replace the float as well, if the needle contact area is dimpled.
That should fix it. Gordon Raymond

Ah yes, and besides that spacer, Alfa also planned #'s: 1315.44.075, 1315.44.076 and 340.510040 to drain the manifold when the fuel does runnith over!
Best, Gordon Raymond