I have not adjusted the valves yet, and it certainly needs it. I don't have the spare funds for the special wrenches that everyone seems to say are needed. All the pairs I see range from $80 to $100 which is just too much for such a simple and surely cheap tool. Am I wrong to think I need to spend that much? The dieselgiant glow plug repair is what I followed to check the system 6 months ago, but its time to check again.

On a separate note, its time to change the spin on fuel filter, should I do that before doing a purge to get the best results, then change it again, or do the purge with the old filter, then change it. It seems like if the filter is already really dirty, it might be a good idea to do it before and after the purge...

Also, does the fact that when I remove my fuel cap I get no pressure release mean my tank screen is clean? Or I suppose it might mean my cap seal is bad, cause it is hard to believe the tank screen is clean.