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Fuel Filters

If the fuel filter on a 1999 Kia Sephia is plugged would it cause the check engine light to come on and the car to run badly?

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the engine is breathing badly,probably worn piston rings or worn valve guides

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Most definitely! Replace the fuel filter every 36,000 miles at a minimum. A dirty fuel filter will also cause your fuel pump to fail prematurely. It causes the fuel pump to work harder than normal to move the fuel to the engine.

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Perhaps a badly clogged fuel filter?

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check the fuel dilevery filter and pump both in the tank

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Not really enough information given - however - if they are badly out of adjustment you might be referring to the sound of the valves tapping - OR - you are hearing the noise of pre-ignition - perhaps the timing of the engine is off badly.


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