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In the 2005 Acura MDX, the fuel filter isn't something you can easily replace. It's actually part of the fuel pump assembly inside the fuel tank. Generally, it should last the entire lifespan of the vehicle. However, if you suspect any problems, you'll have to swap out the whole assembly. It's best to avoid this if possible, as the issue might be elsewhere in the system. But, if you're sure it's the pump or filter causing trouble, it's recommended to have a qualified mechanic handle the replacement. Dropping the fuel tank is necessary for this job, which can be quite challenging without proper equipment like a quality lift. While it might cost you some money, it's better than attempting the job yourself and potentially damaging other components.
The fuel filter on a 2005 Acura MDX can be found inside the gas tank, specifically situated below the back seat.