The good news is that it’s not a major issue. The issue has arisen from a fuel hose that may not have been made properly, and can start leaking fuel. Toyota says that only three instances of the fuel hose issue have been discovered, and no accidents have been caused by the fault.
If you do own one of the 19,099 possibly affected cars, get down to your dealer and have them inspect and possibly replace the faulty hose. If it’s a problem, Toyota will fix the issue free of charge.