I opened my fuel tank on the mower once and a piece of the gas cap fell off and into my gas tank. I ordered a new cap. I gave the oppropriate part number - that being 37844. The cap I received looks different than the one I had. I have posted two pictures. The first looks like the cap that broke. the silver part is what fell off. I was using the new cap and thought I was having carburator problems - gas not getting to engine. When I was taking the mower apart to look at carburetor, I noticed only a limited amount of gas flowed out of fuel line from tank to carb. I knew the tank was full. When I loosened the cap (to remove it to check for gas) just the release of pressure allowed the gas to start flowing out the fuel line. Could my problem be the gas cap?