I dry fit mine first w/o the sock. when standing from the rear of my tank, the fuel and return lines pointed to around 2 o'clock. my sump area inside the tank required the sock to be pointed at 12 o'clock, so I was not exactly parallel or perpendicular to the axis of the fuel lines. My sock kept popping off when putting the bracket into the tank and I had to bend the small metal tabs on the sock with a small screwdriver to get them to hold onto the pump. the pump/sock assembly was first inserted with sock facing 3 o'clock, then slowly rotated towards 12 o'clock once you get the assembly a bit deeper, taking care not to knock the sock off again on the walls of the sump area. Not as straightforward as I initially anticipated. remember to put your o ring on first and lube it with a bit of motor oil. It is possible to slip it on over the top if you forget to put in on first though.