The clips on the fuel filter pipes are quite stiff, you have to push them on really hard until you hear a 'click'. Also if the filter has been replaced, some manufacturers provide new clips with the filter, it is always advisable to replace them. If they arn't in with the filter some motor factors supply these clips for a matter of a few pence.
Sometimes the hold bracket for the filter assembly is knackered, make sure you either replace the bracket or use tie wraps to secure the filter to the structure, if you don't do this the constant vibration and movement of the vehicle will loosen the clips from the filter body.
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