[huey286]

Originally Posted by huey286

How about a '91 Buick Lesabre LTD, 180K miles, 3.8 eng. This car is plagued with stumbling on hiway and occasionally dies coming up to corner. normally, idles and runs perfect and smooth, and when it dies, I can go to neutral and restart on the run. Have replaced fuel pump,filter, and regulator, crank, oil press, coolant, and o2 sensors, ign mod, coil pack assy, plugs, wires, and maybe some things I don't remember. nothing changed. Today, I unplugged connector from solenoid on top of fuel cannister, and it ran fine. Anyone know about these things? What they do,how they're activated, How to check it, and symptems of its failure? No gas smell or plugged filter on bottom of cannister. Could this have been my problem for last 2 years? Could it be creating a vacuum in fuel tank?? Thanks, Huey286

I have replaced the purge valve/solenoid on top of cannister, old one was sticking. Did some checking for/with vacuums, I can pull vacuum in tank with hand vac pump hooked to vent hose to tank. pumpes a few times, then unscrewed gas cap and heard hiss. And I get about 20 Hg vav at bottom of purge valve, so now know it's working right. But cannot detect vacuum in cannister, so it can't pull any vacuum in tank, rather just pulls in fresh air in through bottom of cannister. should I be able to get vacuum built up in cannister, and how much? don't know what's in these except air filter and charcoal. Any check valve, etc, that would allow vacuum build-up to create vacuum in tank? Not on this '91. Thanks for any help. After replacing purge solenoid, ran well for a day, now detecting slight return of problem.