SOME VEHICLES MAY SET A DIAGNOSTIC TROUBLE CODE P0442 (EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECTED) WITH NO FUEL ODOR OR LEAKAGE PRESENT. ALSO, WHEN USING THE ROTUNDA VACUTEC 552 LEAK DETECTOR, SMOKE MAY BE NOTICED FROM THE TANK AREA BUT NO LEAK IS FOUND WHEN TANK IS LOWERED. *TT