If that connector is dry-rotted I reccomend inspecting all soft connectors, and hoses.
There are a few, one comes fuel tank EVAP from underneath the rear, it goes from tank to hard line, it is not too long.
There is one that comes out of the lower rear of the upper intake manifold, it runs into a wiring harness on the left rear UIM area.
There are a few more, once this snow melts I'll try to work on taking pics of all of the ones I replaced on my car.
All are easy to replace, and pretty cheap since you can buy the hose by the foot at a local auto parts store.
2006 Pontiac Grand Prix GT with SC
1996 Buick Park Ave NA