I have a fuel leak, of course, I've canged the injector, the o rings are fine, and everything fits as it should, but its still leaking, i don't understand it. does anyone else know what could be causing the leak. and another thing, how can you tell if the injector is bad or good, by looking at it? thanks for the help. Oh, i have an in line 6, 4.0 2 wd.