how do I remove a tank of bad gasoline from my 2005 Mercury Grand Marquis?
You can saffle it,but the best way if it is bad gas,is to drop tank and clean it,that way you can clean the sock on the fuel pump all so.
T S T is right but if you do drop the tank I would bite the bullet and replace the fuel pump assembly at that time due to the fuel pump problems that do occur after a vehicles fuel has gone bad, also don't forget to replace the fuel filter as it will have bad fuel in it too.
also purge the injector rail. take off test valve, schroeder valve looks like a tire valve http://www.ehow.com/how_5144292_bleed-fuel-line.html ... ... http://www.ehow.com/how_8291909_bleed-fuel-system.html
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