You are right, I don't know for sure it needs a diesel purge. I do know the it has 82,000 miles on it , I've had it since 30,000, the fuel milage has gotten worse and many of the guys purge at lease twice a year. I just spent $400 having my glow plugs replaced and I think I can do this job my-self (with a lot of help).
As far as which hose to remove, I'am still not sure which one. there are two small hoses coming off the filter. Are we talking about the one closest to the wheel. Any more help would be appreciated. Thanks Ready-Ronnie