Well you've made it pretty far down the FSM P0442/P0440 (same) list of possible culprits:
1) Hose or tube cracked, holed, damaged or loose seal ((3) in Fig. 1)
2) Fuel tank cap incorrectly installed
3) Fuel tank cap cracked or damaged
4) Vacuum hose cracked, holed, blocked, damaged or disconnected ((1) or (2) in Fig. 1)
5) Fuel tank cracked, holed or damaged
6) Charcoal canister cracked, holed or damaged
7) Open or short in vapor pressure sensor circuit
8) Vapor pressure sensor
9) ECM
Luck.
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2001 Limited 4WD - 349+K - SunfireRed\Thunder Cloud; - 265/75/16 Michelin A/T2s - Fat Pat's 1.5" BL - StopTech ANGLED rotors - In series 699 trans cooler, New Yota1 transmission, All new OEM suspension front to rear.