2004 Pontiac Grand Am freezing weather wont start

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2004 Pontiac Grand Am 4 cyl Two Wheel Drive Automatic 70.000 miles

I have a 2004 grand am and let it set outside 20 degrees below, I assume fuel is froze up, before this a week ago went to another town and died a couple of times, I get it service when supposed to. I dont know if they put new fuel filter on when they service or not, I am assuming not. I checked that valve on the fuel rail { lines } by the motor with the car off and pushed the needle in and just a little gas came out and quit, should all the gas in the line come out with the pressure or will it only keep coming out if I have the key on and the fuel pump running, I was just thinking more should of come out than did even with key off, only got about a thimble full. Can I check that with the key on and fuel pump running, it should keep squirting out if the lines aint froze, is this correct ! And I did put heat in the gas tan a couple of fills ago ! Any ideas ! Thanks