Damo, suggest you don't just go ahead change the filter and crank the engine. Been out having a play and have found that the large white knob on top, when unscrewed is actually a plunger so would suggest that this is the primer.
I am at present getting hold of a filter wrench to undo the filter, once done I will simply follow the procedure for the 2.8, just have to work out which is now the bleed screw. The white screw driver head or copper bolt. The filter didn't drain too well until both were removed.
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