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Condensation in your fuel, freezing in cold temps. Get your car into a warmer place so the ice can thaw. Add a bottle of dry gas for your next few fillups, and then monthly after that until overnight temps are consistently well above freezing.
At the risk of repeating myself - and not accusing you of this - but I keep running into people who rarely FILL their gas tanks. The empty space above the liquid gas in a tank is vented to atmosphere, and in climates damper than my current desert home there is a surprising amount of water vapor in the air. When the ambient temp dips below the dew point, the water vapor condenses in the tank and sinks to the bottom, since water is denser than gas. Then when the temp dips below freezing, trouble can happen - it only takes ONE drop of water to freeze in the wrong place, and it's "all stop" time. Filling the tank frequently minimizes the likelihood of condensation forming, although if you live in a cool or humid climate, frequent use of dry gas is really a good idea.
A second reason to fill the tank rather than adding five bucks worth of gas is that the in-tank pump relies on being immersed in fuel for cooling. Consistently running on a fraction of a tank will measureably reduce the lifespan of the in-tank pump.
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