For two hours I tried getting the QD connections off of both tank and line near the fuel cooler. No dice. So, I tried doing the lines on the fuel cooler. No problem, piece of cake, they came right off. What I realized is the smaller tool has a much longer section that goes into the fitting. The larger size is very short and does not seem to engage at all compared to the smaller size tool on the return line, where I could feel a big difference when it engaged the fitting. Here is a pic below showing the lip size on the 1/2" tool. I got this tool set at Auto Zone. Did I get ripped off?