Just in case you don't know, you have to have a scan tool that will do the EVAP system test. You'll also need the fuel neck adapter. Typically they come with a peel-and-stick paper you apply to the adapter and stick it to the fuel filler neck. Then you close the evap valve using the scan tool. Then, with everything closed off you can inject the smoke via the adapter. IIRC only about 2psi is needed. Crawl under with a good light and check hoses, connections to the valves, the canisters themselves.

 

Thanks so much and that is not something that I was aware of. I do have a scan tool that I used to pull codes for the car, and I'll see if it can perform this test. Also I was under the impression that the smoke was injected via a test port on the Purge Valve. At least that's according to the workshop manual that I have. Is that not correct and/or is the fuel neck the preferred way to do it?

 

TBH I didn't know the valve had a test port. I'm willing to be educated, but I don't recall seeing anything like that when I replace my stuck valve.

 

The Canister Close Valve does not have a test port but the Purge Valve does on the later ones.
There is a GREEN cap on the later model purge valves.

The CCV is closed with the scan tool during the test to seal the tank and EVAP lines.

 

Interesting and I'm learning a lot of new information here. My car is a 2002 and I'm following a 2001 workshop manual. Here is the section that I'm looking at :

2001 XK RANGE - Evaporative Emissions - 303-13 Standard Federal Testing Procedures (SFTP) Test Port To comply with Standard Federal Testing Procedures (SFTP) a test port is provided on the evaporative emission (EVAP) canister purge valve to enable leak test diagnosis of the fuel system.

My scan unit is an Icarsoft unit Jaguar and Land Rover specific. Does anyone know if this tool will properly close the system in order to test it?

 

The 2001/2002 4.0 cars are the SAME. There was no change to the car as Jaguar was anticipating the release of the 4.2 Jaguar as the 2003MY.(2002.5)
We were issued new electrical guides every year as 3 ring paper booklets but if there were no changes, we simply got a new cover page with the combined year models printed on the page indicating the cars were the same, no changes.

The 2002 electrical guide is the 2001 guide.

 

And yet… the check engine light is back on and code P0442 is back as well. The car smells of gas fumes and the mileage is down but not the power. So now, I too am going down the Evap system rabbit hole yet again. 12k miles ago I installed new valves and put in new charcoal into the canisters. That was to solve the gas pump issue where the car would take forever to fill. Replacing those parts solved it then. Maybe it’s just a leaking hose somewhere now.