Read that thread I posted to learn more about it. In most cases, you can hear the fuel pump priming but no fuel makes it to the injectors. From what some people have said, you can push the pin back on. In both my cases, I ditched the failed ones since I didn't feel comfortable using them anymore. When the metal piece falls out, it'll be contained inside the fuel canister. It will rattle around when you handle the fuel canister.