Do yourself a HUGE favor, and while you are doing maintenance, install a Mr. Gasket diesel fuel pump on the outside of the fuel tank to push the fuel to the filter and engine.
The advantages are two-fold: Prime your filter (and remove any possibility of the air-in-fuel problem which WILL get your CRD at some point) simply by turning the key on and waiting a few seconds.
Second: The injection pump will no longer have to struggle to suction the fuel through the filter, robbing you of horsepower. Longer pump life is the benefit here, as well as potentially longer filter life too.
The Mr. Gasket pumps can be sourced from your local parts hut, and are about $60. They are also known by the brand name "Facet" and are a flow-through design, so should the pump fail someday (mine has lasted in excess of 50k miles so far) the vehicle will simply be in "stock" mode again and you aren't stuck somewhere.
Wiring it in is easy, depending on your preferences. The harder (but prettier) is to use the wires that are under the carpet under the back seat. I do not know where beyond that. I did it the quick-and-dirty way by running a single power wire directly to the already-existing relay in the engine power center by the battery. I just tied the wire to the fuel lines to keep it safe. Yea, redneck, but it works.
Or you could wear out your hand pumping that thing every time you get a new filter or an air-in-fuel.