I'm about to change the fuel filters on my 1984 300TD. I wanted to do this before I mess with the linkage. I'm going to follow this video's instructions.

http://www.youtube.com/watch?v=A3iJ5rTBwe4

Do I need to have the fuel drained before I do this? I know he mentions a clamp but are there any surprises I might encounter like spewing/spraying fuel? Is it necessary to fill the secondary filter with fuel or can I install and then prime pump it?

digi