Fuel filters clean fuel and help protect fuel injectors. One typical example of a restricted fuel filter is a vehicle that cuts out or loses power driving up an incline, such as a bridge. Under load, fuel demand increases and a clogged fuel filter reduces the needed flow. As the fuel filter gets dirty, the fuel pump works much harder. This is why a restricted filter may damage the fuel pump as well. So I change fuel filter every 30 to 40k km, its cheap to change anyway.
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