Thanks Dewfpo

I checked the vacuum that is required to the pulse valve for the cannistor, it's so intermentent that there is just a small amount going thru--as you were stating-so I guess that explains the click from the valve itself.
When I owned 240's and my 940 turbo I watched what was going on with fuel mileage and could just about tell when something was going on ,like a vacuum leak ,that would cause the mileage to go down. With the 960 and all the miles on her now I tend to look at mechinacal parts causing problems. Facts are though ,when you start seeing mileage fall off, vacuum leaks are really the first place to look. Lots of good indy shops and Volvo shops as well tend to overlook just these little things--I guess to go after more high dollar parts instead of a vacuum hose.
I'm going to install a vacuum gauge in the car soon, I noticed that Sun has a small pod that can hold a gauge and be installed with a good clean look.
Thanks again
Hope things are going well
Poolman