Good Point WPoll.

I’ve never had an issue but i use hose with a large ID/OD wall. So definitely something to consider

Yeh I would definitely suggest buying one of the pumps above. So useful with all the bloody plumbing on cars these days. And cheap as well. I was just trying to suggest ways of testing if the OP didn’t have one.

I would say my 535d had the exact same symptoms as yours and it turned out to be a combination of vacuum leaks and a duff solenoid. FYI the solenoids are £29 on eBay here in the U.K. I would try to get a Pierberg one if you do need one as I believe that was the original manufacturer.

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E53 3.0d Sport 119,000 Miles
E61 535d Estate - Hybrid turbos and Dark-side intercooler...389hp,792nm