Possible Vacuum Leak

[Dbsilverton]

I have a 2005 Volvo s80 2.5T that has been sputtering during low RPM acceleration and idling rough (at around 1,000 RPMs).  I got an error code, P0496, and I suspected that the vapor canister purge valve was bad after talking with the guy at the parts store.  I went home and took a look at it to get an idea of what I was ordering before I looked for it online.  While I was looking at it, I noticed that the vacuum hose going into the intake manifold was badly dry rotted and spit almost the entire length of the hose.  I figured that might be the problem, so I went back to the parts store where I bought a new hose, and a can of Seafoam.  I put the hose on in the parking lot and I noticed right away that my car idled much more smoothly, this time around 750 RPMs.  I figured that my problems were over as it did not sputter at all on the way home.  I then proceeded to use the Seafoam, just as I have done in 1,000 cars before, but never this one.  I disconnected the vacuum line from the brake cylinder and used a clear hose to slowly suck out a third of the bottle over about a 5-10 minute period.  To be clear, it was sucking the Seafoam into the vapor canister purge valve from he right hand side as you face the car.  Yes, that was probably not the best place to insert the Seafoam, I know that now. I let it gradually suck in the fluid, very, very slowly as I always do.  Then I shut the engine off and waited 15 minutes.  While I waited I noticed that there was a fluid running out form under the car.  I smelled it, yup, Seafoam.  The purge valve has three nipples, the one that I put the Seafoam into, one straight across from it that goes into the intake manifold, and one on the bottom that goes into a little silver can, that I assume is the vapor canister.  The Seafoam is obviously leaking out somewhere at or around the purge valve canister(if that is what that silver thing is), but it is not leaking from the hose coming into it from he purge valve.  When I turned the car back on and test drove it, it ran fine, no sputtering, but also no smoke, which makes sense because the seafoam never made it to the engine.  Sorry for the long synopsis, but here is my question.  Is this supposed to happen because I was dumb enough to put the Seafoam in the wrong part of the system and the canister is designed to overflow? Or is there a leak in the canister that I just can't see?  I can't imagine that it is supposed to overflow, given that it is vacuum sealed system.  Any help with this would be greatly appreciated.

[troyhyde]

The canister vacuum is coming FROM the engine, there is no vacuum coming from the tank, hence, no sea foam likely backfilled the canister.  If it was being sucked out of the can, it was going into the engine.  Only way to get liquid sea foam into the evap system would be with the engine turned off.

Regardless, drive the car and it will all get slurped up rather quickly should any liquid be floating around inside the vacuum lines.