2006 Toyota Corolla Owners Manual - Page 297
2006 Toyota Corolla Manual
Page 297 highlights
'06 Corolla_U (L/O 0508) Leak detection pump This pump performs fuel evaporation leakage check. This check is done approximately five hours after the engine is turned off. So you may hear sound coming from underneath the trunk for several minutes. It does not indicate a malfunction. ix