Maybe it's just the angles of the photos, but it looks like your fuel tank is mounted too low. The top-side of your tank appears almost level with the center of the carburetor inlet.
In a desired arrangement with the airplane sitting level, the center of the carburetor inlet would be ~1/4 inch above the centerline of the tank. With a 12 oz., side-mounted Dubro tank, the tank centerline would be ~1-1/4 inch below the top-side of the tank. The desired arrangement would have the top-side of the tank ~1 inch above the carburetor inlet .