Fuel Tank & Filler Pipe Air Tightness
WARNING: This page is about a different car, the 2003 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect EVAP line hose from charcoal canister side and pressurize fuel tank to .58 PSI (4 kPa). See Fig 1. Check that internal pressure of fuel tank holds for one minute. If pressure does not hold, check connected portions of each hose and pipe. Check installed parts on fuel tank. If connections and parts are normal, replace fuel tank and filler pipe. Reconnect EVAP line hose to charcoal canister.