Is it worth to filter the fuel / gasoil we buy from the fuel station before putting it in our car ?

Filterings may include - removing small particles - removing the water that might be in the fuel - others ...

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    Are you asking for something in addition to the fuel filter that's already installed in your car? – Bob Cross Jan 29 '14 at 2:04
  • @BobCross: by "before use" I meant, "before putting the few in the car". Fuel that is sold is known to contain lots of crap that damages the engine, and that accumulates in the fuel tank. The goal is to get rid of that crap and pour Pure Diesel in the car fuel tank. – Skippy Fastol Jan 29 '14 at 2:10
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    I don't agree with the phrase "known to contain": the woman in the cube next to me drives her diesel every day for a total of hundreds and hundreds of miles per week. She never thinks about the fuel quality (other than how rarely she has to purchase it) and she never has a problem with quality. Perhaps your source is questionable? Or perhaps someone is marketing a fuel filter at you? – Bob Cross Jan 29 '14 at 13:15
  • The real starter behind my question is the fact that Fuel Tanks of cars get their bottom filled with a disgusting kind of "black paste" after a few years, which seems to be the result of impurities accumulating – Skippy Fastol Jan 29 '14 at 19:27

I would have to say that it probably isn't worth the effort to pre-filter the fuel. In general, if you're buying fuel with noticeable water in it, then get your fuel somewhere else. The existing fuel filter (providing you're using a good quality one and not a $2 one) should be plenty sufficient to filter small particles etc.

The hassle involved in buying your own bulk fuel and pre-filtering or even trying to rig up a pre filtering system to the inlet of your fuel tank seems like a lot of expense and effort for very little gain.


The issue of dirty fuel has been greatly mitigated by modern pollution control regulations. Twenty or thirty years ago a lot of underground storage tanks were steel. The steel was prone to rust. The rust would be caused by the water that would settle to the bottom of the tank. The water would be introduced into the tank from the ambient air that goes into the tank as it empties or ground water that seeps into the tank at any leak points. Modern tanks are for the most part non metallic fiberglass, hightech plastics etc. When the tanks are installed, most areas require some sort of fuel leak detection. If a leak that allowed groundwater into the tank occurred, fuel would also escape setting the fuel leak alarm. As fuel cost have risen electronic fuel volume monitoring is also prevalent. This monitors fuel in and fuel out. Any water leaks into the tank would be shown as a difference between fuel pumped and fuel stored. What all this means is prefiltering your fuel is not worth the effort unless you live in a remote area with a known issue of contaminated fuel.

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