Can someone please help, I'm not sure what I'm doing wrong. I'm working on my 79 RS. It has a stock replacement fuel pump (w/return line), And I have new holley 1850 600cfm carb. No matter what I do the back float bowl over flows when I start it up. I have checked the needle & seat for dirt,damage etc.. The float moves freely, I even put a holley fuel regulator on it. I have adjusted the float to as low as the adjusting nut will allow. Still it over flows. Anyone?
Well I went and found an off brand needle & seat and installed it and my problem stopped. As for pressure it is at about 5psi now. I'm going to play with it a little and see what happens.
So much for using Holley brand parts to fix it. The needle & seat I used the second time was a hygrade part.
It looks a little different but has the same overall dimensions.