Where is the fuel filter located and how do you replace it To replace the fuel filter in a 1999 Mazda 626 V6 you will first need to located the fuel filter. Open the hood of the vehicle and look for a silver round object near the engine. This is the fuel.. Volkswagen Passat Fuel Filter - AutoZone Order Volkswagen Passat Fuel Filter online today. Free Same Day Store Pickup. Check out free battery charging and engine diagnostic testing while you are in store.