My durango wont start, its 20 degrees out, It will only turn over. i filled it up the day before and i didnt drive it yesterday and its been snowing all day. She will will crank but no fire, i pounded the gasket tank with a rubber mallet thinking it could be the fuel pump, i didnt try listening to see if it turns on when i turn the key on. but she coughs alittle after i stop cranking it, and it did that a few times after hitting the gas tank. idk grrrrr