I have fuel leaking right out of the top of the injectors from where the return line fittings go into the injectors. I bought 2 new return lines, one for either side and installed them with new o-rings and made sure they sat flush. drove it for a week and half of them are still leaking. any suggestions on how to clean the top of the injector out? I'm guessing its rust or whatever sitting in the top of the injector but I'm not sure if I can remove the injector and let it soak upside down in CLR or clean it with a wire brush some how