Toyota 2006 Tundra Owner's Manual page 10

'06 TUNDRA_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 under-
neath the rear deck for several minutes. It does not indi-
cate 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 preten-
sioners, and wireless remote control batteries.
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2006 TUNDRA from Oct. '06 Prod. (OM34458U)