replacing leaky return fuel lines

[Jon Erblich]

the return fuel lines on the drivers side rear of my 85 300TD seep, and leak diesel fuel out of the drain under the spare tire.

before I attempt to cure my beloved wagon's incontenance, any helpful hints from you pros would be gratefully accepted.

specifically, where do these lines originate/lead to? procedurally, which end should I clamp down on first with the old vice grips in order to prevent air getting into the line?

i've read that it's critical not to allow air into the fuel line, otherwise you have to bleed the system. idiot-proof me here if possible. worst case scenario, how do you bleed the system? i know where the knob is for the pump, but do you turn the nut on top of the filter housing counter-clokwise a bit, and then pump, or is it vise-versa?

thanks...........