The fuel filter of your Ford FOCUS needs to be replaced regularly to avoid your engine getting damaged from the particules present in the fuel tank.
If your vehicle has a diesel engine, you will need to order a Ford FOCUS diesel filter. If the engine uses petrol, you need a petrol filter for your FOCUS. Easy enough, you’d think! Not quite. Always check on the product description which type of fuel filter is concerned to avoid ordering the wrong type by mistake.
Certain Ford FOCUS fuel filters are sold in the form of a simple filter element and others have a metal casing. Understandably the latter tend to be considerably more expensive but they are also a lot more effective!