Im working on a 86 300sdl 6yl.Im leaking fuel out of the valve on top of the injecton pump where the line screws on and goes to the injector.Its not the line so there must be a o-ring on the bottom that seals it.The prolbem is, it has a spline like threads to get it out.Does anyone know what socket to use on this or a number for it and where to get one?