Toyota 2007 4runner Owner's Manual page 483

06 06.07
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 luggage compartment for several minutes. It
does not indicate a malfunction.
x
2007 4Runner from Aug. '06Prod. (OM35866U)