I replaced the seal and needl/seat in the old carb, and I never took it apart at first. I just cleaned the outside up. I'll make sure to use a wrench on the pump side to from now on. The new pump leaks just like the other. I got some brass fittings with hose barbs and they leak on the pump and the carb. You must not be able to use brass with fuel? How tight do the fittings have to be? I tighten them up so they are real snug. Or do they need to be as tight as possible? I have never experienced a problem like this and its getting irritating when all the parts are new and still arent working.