Fuel Tank & Filler Pipe (ES300)
WARNING: This page is about a different car, the 2002 Lexus RX 300 and 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect EVAP line hose from charcoal canister side and then pressurize and make internal pressure in fuel tank .58 psi (4 kPa). See Fig 1. Ensure internal pressure of fuel tank can hold for one minute. If pressure does not hold, check hose connections and installed parts on fuel tank. If hose connections and installed parts on fuel tank are okay, replace fuel tank.