2007 Toyota Tundra Owners Manual - Page 628

07 04.26 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 deck for several minutes. It does not indicate a malfunction. Perchlorate Material Special handling may apply, See www.dtsc.ca.gov/hazardouswaste/perchlorate. Your vehicle has components that may contain perchlorate. These components may include airbag, seat belt pretensioners, and wireless remote control batteries. ix 2006 TACOMA from Sep. '05 Prod. (OM35858U)