Can I use Power Service diesel Kleen to fill up my fuel filter when replacing it? This is going on my 03 LB7
On the side subject of draining your oil and not filling the oil filter. dnewton3 is right about introducing possible contaminents into the system past the filter. This is another good reason to use a quality oil that has superior film protection. With superior film protection the engine parts will be coated and endure the few seconds of non oil flow due to not filling the filter with oil. Do your research when choosing a lubricant for your biggest investment aside from the roof over your head. The cheapest or what is on sale isn't always the best in the long run.Whoa!
BTW, on a slight detour, but similar subject: I know that many "pre-fill" an oil filter thinking that they are saving a second or two of the "no-pressure" condition at start up upon a filter change. Same concept here applies as the fuel filter.
Pouring unfiltered fluid into the filter (typically in the center hole - where all these people do it) introduces UNFILTERED oil into the system, and it's heading right for everything you think your protecting. The risk of no oil pressure is outweighed by the risk of contaminants getting into the circulatory path and wreaking havoc. Believe it or not, as long as you do an oil change in a few minutes, there's enough residual oil clinging on the metal to help during that couple seconds or no pressure.
In fact, I've always been a proponent of changing oil as quickly as possible, to purposely leave some oil up in the bearings for this very reason. Some people will pull the drain plug and let it drain down for 1/2 an hour, thinking they are getting the very last drops of oil out; that's true, but they are also leaving the bearings quite dry. I prefer to drop the plug and filter as quickly as possible, and when the oil starts it's dripping, I put the plug and new filter back on quickly. Then I fill and start as soon as possible.
It's your choice, but prefilling any filter is a risk.