Mike C.

I have an early '85 944 and am trying to track down a strong fuel odor in the car when I shut it down after running a while (up to temp). I don't know if the 928 has a similar set up - if so, maybe someone here can shed some light?
I've checked all of the vent line connections and hoses and no 'smoking gun' found. I'm now looking at the shop manual trying to figure out how the tank venting system is supposed to work when car is running vs. not running. With the engine stopped (and cold), the vent control valve (smaller diameter metal thing) is open as I can easily blow air through it (lung pressure). If I then put a vacuum on it, it closes - so apparently engine vacuum (larger hose) is not supplied to shut off valve when engine is running (shut off valve is the larger diameter plastic thing). The shut off valve diaphram is connected to a water temp vacuum switch which tests closed in the cold state (haven't checked it warm yet). I assume that means when up to temp and running, vacuum gets applied to the shut off valve diaphram and the valve opens. The other connection on the shut off valve Tees into the vent line (going to back of car) and the vent cannister. So what what is supposed to be happening when engine is shut down (warm)? The control valve will be open and (I assume) the shut off valve will close with no vacuum applied from the temp switch (open or closed, no vacuum available). If anyone understands how the vent system is supposed to work, I would much appreciate an explanation.... I just want to figure out if the two valves and temp switch are doing what they are supposed to do. The manual is mute on testing them...

SeanR

On the 928's there is a Y connector inside the passenger/front wheel well. You have to take the cover off to access it, but that is where the majority of our gas smells come from.

I would suppose that for the 944's, Juan95 is causing most of it, but that is an OT thing.