Could someone just explain to me quickly how to change the spin-on fuel filter. I can't find a pictorial for it anywhere.

My car is a 350SDL. The new fuel filter I have comes with 2 O-rings. Where do these two O rings go?


I am also doing a diesel purge. Can someone tell me if I can change both these filters BEFORE the purge - wouldn't that better prime the system than changing them both after?

Thanks,

Tyler