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What Does a Fuel Filter Do?

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Part of the video series: How to Change a Fuel Filter

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Summary: Keep fuel pumps working well by filtering dirt and rust particles out of a fuel line. Learn how a fuel filter works in this free video.

Views: 751 | Tags: maintenance, change, fuel, cars, replace, trucks, repairs, vehicles, filters, engines, automobiles

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About the Expert

Nathan McCullough Nathan McCullough graduated from Nashville Auto-Diesel College and received their Craftsmanship Award and Honor Seal. McCullough has managed several automotiv... read more

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Video Transcript

What Does a Fuel Filter Do?

Hi my name is Nate McCullough on behalf of Expert Village. In these following clips we're going to talk about removal and replacement of the vehicle's fuel filter. In this clip, I'm going to show you exactly what your fuel filter does. When you go the gas station and fill up with gas, you get it out of a great big underground tank which is made of steel, and that steel does rust. I have the inlet side of the filter plugged and it's full of gasoline. I'm going to drain it out into this coffee can and show you exactly what your fuel filter is catching. As you can see, what we have inside my coffee can here is a real dark nasty looking liquid. I wouldn't even call it fuel anymore. It looks more like iced tea, just about coffee to me. It came from the inlet side of the filter, so the filter was doing its job; it stopped that contamination from getting into the rest of the fuel system. Like your fuel pressure regulator and fuel injectors. This contamination came from old fuel tanks that are buried in the ground beneath where you get your gas at. Over time they degrade, begin to leak, and can become contaminated with water and rust. That's why you have to have a fuel filter. As you can see, this is not even really near clear, it's not the nice amber, maybe even a bluish color that gasoline should be. This is more like iced tea or coffee, it's highly contaminated rotten fuel. This wouldn't make it through one trip in your engine; this would actually damage or destroy your fuel injectors.

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