Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Parts picture above is unclear as to where the fuel comes out of the tank, but appears to come out the side ,near the top, that means there is a suction line on the inside ofthe tank. Likely this hose is broken. You are not using the on tank, see if you can screw out the fitting in the tank on that side and see if it doesn't have an internal hose that goes to bottom of the tank. If it does, you can then swap the fittings or repair the other sied.