- Buick Ownership
Can't really help you with the location of the lines, I don't have the car anymore and I changed that valve about three years ago.
The hose going into the valve is about 0.5 inch. Perhaps you could disconnect it, slide a piece of garden hose on to the steel line and blow into it using your mouth, not high pressure. I would think from there it's a sealed system, so you shouldn't be able to blow air into the tank.
Another thing you mentioned, I had a rusty fuel line leaking on the left side just ahead of the left rear wheel last winter. Started to see a stain on the driveway, but before that the car would crank a couple seconds before starting when I had been sitting for a while. What was happening is the pressure that would normally be in the line going to the injectors was bled off due to the leak, so if your car cranks a bit longer than it should on the first start of the day you could have a leaking line. That was the last straw, I had so many problems with that car it was time to let it go.
How many miles did you have on it before you got rid of it? I heard the motors were fairly reliable but I guess a lot of the components are not I noticed the door actuater burnout I don't know how often of a problem that is but a guy at the dealer tried to say that usually the handle on the outside falls off said he doesn't get many people buying actuators which doesn't seem to make sense but I guess the guy believes so. I currently have two bad door actuators I'll be placed one on the passenger side now I've got to do the rear driver side.