Son asked me to give his newly acquired '08 plate Iveco Daily a service. He sourced the parts, but the fuel filter is giving me a bit of grief. He's supplied a Crossland filter element that I assumed would go inside the plastic housing (a bit like the Fiat ones that end up leaking ?) but there's no way I can get it apart, even after making an aluminium driver to fit the top cap. I'm now of the conclusion that it doesn't come apart, and you have to change the whole unit ? Does anyone know if this is the case ?