That injector is 100 % the problem. Oil the inside. . Musky Gary done a mod to his that made it work good. I had one of those that you have, but in a dual injector & i replaced the orings & cut a notch to be able to use a screw driver to twist & remove the tips from the tubes & it worked alright. Since i had one like you're talking about my advice would be to replace with either a basstackle, a do-it or one from quality injector. Basstackle is the best on the market however & is what i'd get if i were you. Never skimp on an injector.