Need some answers for a ms 180

Have a ms 180 that isn’t getting fuel to the piston. Took off spark plug not wet nor is the piston. I’ve replaced the fuel filter and carburetor was replaced because old one failed its pressure test, I am at a stihl shop so I know I have a OEM stihl carburetor. could the little green rubber pressure regulator be bad? I’ve done a pressure test on the fuel line and cylinder it self as well and didn’t get anything suggesting cracks or holes.