[pacman67]

If you are getting bubbles it may point to an air leak. As the car does not have a fuel pump, it relies on the lines being pressurised by the diesel pump. If there is a leak you may be low on pressure, hence the starting problems. Unlike the Peugeot and Citroen version there is no hand primer on the fuel line. I had issues after fuel filter replacement getting the line primed. I visited a scrapyard and got the primer from a Peugeot and fitted it before the filter housing, in the event of a fuel run out or another filter change I can re prime the fuel line. Your leak could be the fuel filter housing, apparently quite common , funnily it seems to show after a filter change. You could try fitting a hand primer and when she doesn't start, hand pump it and try again, worth a try?