We have a 1993 Grand Caravan with the 3.3l V6, and recently (the past year or so) we've been noticing that it has a strong gas smell after driving it for a while (long enough for the the engine to go into closed-loop).
Last spring, I noticed that one of the hoses to the evaporative canister (the hose going from the purge valve output to the engine) was disconnected. I reconnected it, and that helped a little, but the smell never completely went away. Later in the spring, I took a look at the vacuum routing for the engine (comparing against the Chrysler diagram), and noticed that everything was messed up. The rubber Y-junction in the manifold vacuum going from the tree to the EGR valve and the canister purge solenoid was cracked, the EGR valve and EET were partially disconnected, and the cruise control vacuum was connected to the backpressure port on the EGR valve! I fixed all these.
I've noticed since then that the gas tank tend to get a LOT of pressure in it -- when you take the cap off, the gas fumes hiss out and you can smell them really strong. I ran the engine tonight until it got warm, and I noticed no gas smells under the hood, but the tank vapor pressure was very high. (I'm pretty sure it's not vacuum, because the smell is so strong.)
Knowing that the canister output and the control vacuum were disconnected for so long, I'm wondering if the canister may be soaked. I'm also going to double-check the connections at the purge valve, just to make sure they're secure, but is there anything else I should check? I've already checked for fuel line and injector leaks under the hood, and found nothing interesting.
Thanks in advance for any input you can give me.
-lee