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Q: My CEL came on. I was wondering if I have water in my gas. on 2000 Mercury Sable

I was very cold the other day with a 1/8 of a tank of gas.
I started the car ok but it began to run very rough.
I have only had the car for a couple of weeks.
I used to have this trouble many years ago with other older cars. I was thinking that there was much condesation in the tank and went into gas line.
Sometimes the car will run really good and other times, the engine will hesitate with no power giving it the gas.
I was thinking that the fuel filter may still have moisture in it. I put Isopropyl gas treatment into a tank of gas, which hasn't eliminated the problem yet.
Where is the fuel filter located?
Please help.
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It's possible you have water in the gas, most likely code set would be a P0300 (multiply cylinder misfire).More likely an ignition coil or spark issue. Foolish to even speculate without knowing what codes are stored,retrieving these codes will require a scan tool to retrieve codes stored in the computer of your car. There is a fuel filter under your car but requires a special tool to release the retaining clips that keep the fuel lines engaged in the filter. If you did know the codes stored There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate
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