So I have removed the bottle and replaced it with an inline filler from summit. I am running a 20lb cap and as I drive it is still building pressure over 20psi and blowing off into the overflow tank. It doesn't get hot until enough coolant spills out to cause it to. I have no idea. I'm getting very irritated and about to say ef it and put the bottle back in. Any ideas?
Here is the setup. Its in a caddy.