Started new thread with Rochester in it to aid future searches. Original thread was Fuel Tank Venting.

Thanks to Steven Petry for the following testing procedure.

You can test the Rochester Valve if you have a hand vacuum pump that has a vacuum gauge.

Take the valve off and connect the vacuum pump to the small vacuum nipple. Apply 15" vacuum and see how long it takes to trail off to zero.

If the vacuum takes five seconds or more to trail off to zero, the valve is considered good.
Less than two seconds is a failed Rochester Valve.
If between two and five seconds, cover the two large nipples with your fingers and retest to 15" vacuum. If the time for the vacuum to trail off increases, it's a failed Rochester Valve.

ACDelco 214-552 Vapor Canister Purge Valve appears to be a good replacement. Valve was in just about every GM product from 1990-2001. One listing even had a picture of a Rochester valve. I couldn't find specifications on line but at least one Jag owner tried it and it worked. Autozone has them listed as PV132. I would expect any auto parts store to have one or able to get it in a day. If anyone purchases the Delco unit please post back with results.

Submitted by stevejag@sbcgl… on Thu, 07/18/2013 - 01:33

Appreciate the shout out, Sean.

Yep, that's a good replacement. The original GM part number was 17089068. Actually it was used on GM cars even back to the '70s'. I had one on my 1974 Olds Delta convertible with the 350 Olds engine.

Cheers,