Originally Posted by 2_Late_I_Won
My secondary isn't opening on my old school Holley 625-600 cfm carb. I don't know jack about carbs. but I know the diaphragm is good. I took it off and put a vacuum test to it and it stayed down. So I know that is good. I started it up and didn't feel any vacuum where the diaphragm goes and didn't feel any vacuum. I put the air hose to it to blow out any thing that might be blocking it but nothing came out and it blew freely. Like I said I don't know that much about Carbs so any help would be greatly appreciated.
I'm having the same problem on my 600 cfm holley 4175. I'd like some ideas too.