P171 code, vacuum leak found but….
 

…I can’t get the hose off. I am uploading a couple pictures, so any help will be appreciated. Also, do I have to get this hose from the dealer or will the auto parts store have it? Thanks in advance. I love our 2002 XK8…on 50,000 miles and (was) running like a top!
https://cimg2.ibsrv.net/gimg/www.jag...6020a7635.jpeg
From left side
https://cimg3.ibsrv.net/gimg/www.jag...124edafd2.jpeg

Those look like the newer fuel line connections. They need a specialty tool, available pretty much everywhere. It is basically an insert that goes around the line and fits inside that cupola for the purpose of retracting metal tangs holding this connection together. Once the tool is inserted, the lines should just come apart. Just search for fuel line disconnect tool. There are several sizes of course, so they normally come as a set. This type of connection is in pretty wide use, so it is a good tool to have around the garage.

Best of luck, keep us posted.

Thanks, Fred, I will be near the dealership today and will pick up a line and get the right tool!

Just a quick verification. You're pointing at the hose you're having trouble removing, but you say you're fixing a vacuum leak. Those two hoses are fuel lines and cannot be the source of vacuum leaks. Are you trying to remove them in order to gain access to something else?

BTW, once you have the quick disconnect tool, the trick is to force the sides of the hose together. They'll move a millimeter or so. Then push the tool into the large end of the hose, then pull the two sides apart. It's the pushing together first that does the trick.

spring lock connector

I got the codes, heard what sounded like a vacuum leak, car was missing badly, sprayed carb cleaner discriminately, and engine revved when the fuel line was sprayed. Also, engine smoothed out and ran perfectly when starter fluid was sprayed into air filter. This is the first step in finding the problem(s) I’m sure lol…thx for your help!

Does sound like a vacuum leak from the symptoms, but that hose is definitely not the problem. As stated, that's a fuel hose, and you'd be in no doubt if that was leaking, as you'd have an engine bay covered in petrol!