Peugeot 306 90 HDI fuel filter change

[JohnCL]

Can I change the filter without needing to bleed the system after. The local Citroen garage says yes but I'm not sure. If it's OK, how is it best done. The filter casing has arrows on top to open or close but doesn't seem to have any movement when I gently tried it.


On another point I changed the oil & filter and there seems to be two similar sump drain plugs, a black one immediately above the bottom one. Does anyone know what the top one is for?

Thanks

John