Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
CH18, twin engine. It has an electric solenoid in the carburetor. Remove it and remove the inner tip, I think it can be removed, then reinstall it as a dummy an run test. It plugs the main jet in the carburetor and has to stay open or engine will die.
I see question is still open, did you try the fuel solenoid?