Because over time it can trap small particles and become partially clogged. This puts a strain on the fuel pump and can shorten it's life.
Change the fuel filter first. If that doesn't help, change the fuel pump.
"Panda Multijet how to change fuel filter?"
How often should you change the fuel filter?
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How do I change my fuel filter on my 2002 Honda crv? Where is it located at? How do I change my fuel filter on my 2002 Honda crv? Where is it located at?
How To: Change the Fuel Filter nissan
No, they do not have a fuel filter you can change, the filter is part of the fuel pump.
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