So I start up the car after it has sat about a month. As i am looking around under the hood, waiting for the motor to warm up, i see a liquid leeking out. Put my hand in it, and it turns out to be gas :shock: . This is at the end of the fuel rail i believe, A plastic cap, the fuel is leaking from there. I assume i only need a new part, but could someone explain what that thing is for???