I checked at the parts store for a "nut kit", but the guy didn't have a clue what that was and I wasn't sure either, so I asked for o-rings instead. He gave me upper and lower fuel injector o-ring sets. I wasn't sure if that was what I was supposed to get but that's all he offered so I took them anyway. After replacing both sets and cleaning up the injectors the car is running much better and I can no longer see the leak, but there is still a gas smell coming from the engine while it is running and for a while after it is turned off, so I'm pretty sure it is still leaking.
Do I still need a nut kit? And if so, what exactly is that? Or if I just need o-rings for the lines does anyone know what size they need to be?