where is the petrol filter located ?

Hi people ! Where can I find the Bezin filter ? I would like to change the Bezin filter for safety with my Escort because the engine sometimes after starting briefly and after sprit stinks, after 3 min drive it then runs normal. Sometimes it jerks so strongly that the engine control tries to regulate but it then sometimes goes out. If then I start again everything is ok. Where do I find the Bezin filter ? Is this a special or can I use the accessories for approx. 10 Euro take ? Maybe you have tips what it could still be if not on the filter ?