So I rebuilt the carb on my l20b in my 1980 Datsun 720 4X4. I also followed some ones advice and tore it down again. why would I do that ? well my secondary valve will not open. It will open manually and its all gravy but on its own.... nope, nothin , not a dang thing. I don't even have the power to make it back up my driveway. The primary valve had a slight bend to it so my buddy made it flat. looking back I'm not sure if that was the right idea. his logic was the secondary valve was brass and without markings. the primary valve was silver with numbers on it. In all honesty the primary valve looked home made out some old dog tags. we sprayed carb cleaner to check for vacuum leaks. it seems one guess is the secondary diagram assembly had a small leak.
Thats my best guess, I need a new secondary diagram assembly. The part is only ten dollars but cost eight more dollars for shipping. (special order) Also on the front of the carb there is a cylinder with a line coming out of it, mine is black and kinda looks like popeyes pipe a little. It seems to me a fuel filter would go inside this cylinder. I called the auto parts store and asked, they couldn't find one. I also asked for a radiator hose for a 68 beetle and was on hold for 15 min lol.
Im at my wits end y'all any help would be great.