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The fuel 'should' be pretty fresh, as I've been putting new fuel in it. I should, however, drop it to see just how much fuel is in the tank to get an idea of how much old crap is in there.

Will old fuel still backfire through the carb with a flame?

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To mimick Sara P, You Betcha , big boy Pump gas has a shelf life of less than 90 days I have a local customer who has a pump gas Hemi motor I built for him, he keeps the car inside all winter, it has a big 34 gallon feul cell that he keeps half full or more all the time. He called me complaing that the motor wouldn't start after sitting all winter, I took a gallon of race gas over and got it started by pouring a little race gas down the carb. several times until it got some heat in the motor, it would set your hair on fire if you where near the top of the carb. when it wanted to die when he tried to rev it up some more Drain the tank and put it in Moms car with some of the local new fuel in her car, or your pickup EFI and modern system will tolerate thet old fuel better than our cars do