what does engine light code Po1450 mean
P1450 FORD - Inability of Evaporative Emission Control System to Bleed Fuel Tank First check the gasket that connects the gas tank to the filler neck. and see if it is intact or damaged. Second you might want to replace the purge solenoid. .....http://www.autozone.com/autozone/repairguides/Ford-Crown-Victoria-Mercury-Grand-Marquis-Marauder-Lincoln-Town-Car-1999-2005/Components-Systems/Evaporative-Emission-Control-EEC-Systems/_/P-0996b43f802e6562
also, check your gas cap. if its not tight, you can get a code.
Search Mercury Grand Marquis Questions
Mercury Grand Marquis Experts