It's a stupid design. You'd think they would have figured out a better solution with how long this rear end has been in service.
I got the dealer to put the turkey baster on mine, even though my VIN wasn't covered under the TSB. In short order the thing got melted by the exhaust and started leaking again.
I finally scrapped it all and ran some nice fuel hose from the vent, all the way over to the wheel well, secured with zip ties. That long of a run didn't even need a vent filter termination. Finally done cleaning off diff fluid and road grime from everything near the rear axle!