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No mate, if i prime it with it all back together there are no leaks any where and i can get the primer to go hard, but after 10 mins or so it goes soft again, so im guessing the accumulated pressure is just slowley leaking back to the tank via the return line instead of retaining at least enough...

Hi old tony, Yes you are correct it does not fault once started plenty of power no smoke etc. Thats why i dont think its the SCV. Iv had two new filters on it new orings on the water sensor etc. I know the fiter head etc isnt the fault because i temporeraly deleted it by putting 3/8 boat primer...

Found this image and cannot find out if the return has a mechanical spring to close off when the fuel pressure drops to the required level? As mine just stays open and dribbles until all pressure is lost in the primer. As i say if i plug it the primer stays rock hard so no leaks etc. Thanks...

Yeah, no kinks etc. They dont have any sort of low pressure pump, as in this particular common rail it only needs a supply of fuel under minimal pressure from the primer and when the engine is cranked it genertes the high pressure needed for injection.

Hi gents, long post ... im having issus with my 2012 d40 not starting unless i pump the primer up then it will run and drive perfectly, no smoke or lack of power. Iv fitted a new filter head and filter replaced all the hoses to the inj pump still no good.. the primer goes soft after a few mins...