Focus Purge Valve Causing Engine Stalls?

Each car has an EVAP system that traps fuel vapors before they escape the gas tank. Those vapors are stored in a charcoal canister and then, in certain situations, a purge valve opens and allows some of the vapors out to be burned off by the engine. But what happens when the purge valve sticks open?

According to a proposed class-action lawsuit, a stuck purge valve is causing the 2012-15 Ford Focus engine to run rough and sometimes even stall. Additionally, the valve is causing problems with the gas gauge. This isn't the first time we've heard of this issue:

""My vehicle's fuel tank is compressing due to a faulty vacuum purge valve requiring a new tank, fuel pump and purge valve. This issue has caused my vehicle to stall in freeway traffic @ approx 60 mph and to stall in stop and go traffic. – 2012 Focus owner"

While we wait to see what happens with the lawsuit, let us know if you've had any issues with a struggling engine or stalling.