(1) When should the Fuel Filter (Filter Plate or Fuel Suction Plate Sub Assy) be replaced considering the petrol in Pakistan? The car in question is Axio.
(2) Is there any way to know that the fuel filter is clogged without removing it? Even if taken out, visual inspection cannot really tell whether or not it needs to be replaced... So fuel pressure check would confirm? No idea which mechanic would do this in Pakistan except perhaps Toyota 3S.
(3) The above picture is of Fuel Filter from Axio, Part No. 77020-12650 but when you check the Axio parts catalog; the part number that comes up is 77024-12081; why the difference of what is in the car and what is written in the parts catalog? The "12650" does not apply to any Toyota vehicle.
(4) Checking in local spare parts shop, I found that no Filter Plate comes with a parts no. sticker. When you search for the part no. on internet, a lot of these come up on "Alibaba.com". How do we make sure we are getting a genuine replacement?