If it is spinning over OK, you don't need a jumpstart.

Could be fuel, or ignition. Since you could smell fuel, seems you had enough fuel flow and it would be more likely to be ignition.

Always a good idea to keep the tank in the top half in cold weather.

So is it stranded, or did it restart? Either way, start with the codes.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue