Holley 1920 diaphram return spring

desy500 said
Well , that was a lot to swallow, thanks for typing it out. After running with both rebuilt 3920's it was the best it has ran since I got her , but the linkage was not pulling all the was back to idle , it would pull back to about 1/8 away from where idle screw should rest , and then slowly slow down to rest . so with engine off I tried to trouble shoot why - looking at the linkage of both carbs , the springs , everything looked like the pixs I took when I disassembled ? So I disconnected the linkage from the second 3920 ( front ) and the back carb worked correctly ( returning to ideal every time) Anyhow continuing to look for the cause of the hang up on front carb I notice a small amount of gas from the shaft where it comes through on the side where the linkage connects. don't see anything if engine is running , at idle, and not moving throttle , but with continued moving of throttle small amount of gas will appear . I will get a pix and post it

It may just be the pic, but to My eye, that frt. linkage rod is angled, maybe the end at the frt. carb goes in from the frt. instead of from behind. That may be causing a bind if so.
Ahhh, well, You took the shaft out & cleaned everything nicely, now fuel that hits & sits on the throttle/shaft leaks every time the pump squirts enough. It is what it is now w/o
restoring the holes in the throttle base, but shouldn't really affect the running of the car much, just don't pump the gas if You're not planning on starting it!! As I stated above,
check the throttle positions in relation to each other, and slowly operate the carbs watching the timing of the accel. pump arms, they should be as in unison as possible. If You
need to do a lot of adjusting for a baseline, turn off the fuel/pinch the hose & run the carbs out of fuel,..pumping the whole way so they're empty before You begin.