Saturn code p0442, evap system small leak, can't find leak, replaced gas cap, checked hoses under hood, ok. check of purg solenoid, terminal voltage, held vacume, started cold - no vacume to tank thru cold purg solenoid-engine was cold. used hand vacume pump on line to fuel tank, would not hold any vacume. next area to check? is the canister behind the fuel tank? thanks dave