hi! i have 95 volvo 850 turbo i i've been noticing smell of gas too. i've inspected my fuel lines and i didn't find anything suspicious. later on i figured that the smell was coming from the underneath of my battery. i found a black tank with two lines hooked up to it, one of them is leading to the back(gas tank) and the another one is attached to the front of the engine. i took a picture of it so you guys can see and if there is any idea what it is please let me know. Now, there is the third opening "it says AIR next to it" that is where the smell is coming from!!!!!! does anyone know if there should be another hose attached to it or can i just plugg it so it would stop leaking )?

 

That is the Charcoal canister or carbon filter...what ever they call it. I believe it is for Emissions....but tech would knkow for Sure!

Example:

 

I wonder of the evap valve is bad.

 

the fumes are coming out of that third opening the one on the left where it says "air". do you think pressure will build up if i plug that hole, i tried to blow in it and i figured all three of them are connected. how hard is it to find a new one?

 

which valve tech? the number 24 one on a pict?
is there way to test it?

 

Yes the 24 one in the pic.
That one port is supposed to be open. That is for fumes to escape if something is wrong with the system.

There is something wrong in the system.

 

gotcha, yeah there is a lot of fumes coming out of that hole, im afraid im gonna blow up one day, at least i found it, now im gonna mess with it until i fix it. any idea on where to get a new valve? or is there any codes suppose to pop up if something wrong with it?
thank a lot tech, i really appreciate your help.
thanks TIPSP for diagram!

 

There should be a tank system code or something like that.

 

No Problem....

FYI......the pic is from a 95 850 (B5234T5)...assuming they use the same setup?