I am posting this in the Citroen part of forum as the Xantia uses the same type of filter, as do many Pugs.
All the symptoms I had pointed to air in the fuel lines.
Here, in the end, was the cause. A pattern Hengst fuel filter. It was pushing up the lid of the fuel filter and admitting air.


The pictures show a new one and the old one on the right. The old one was very difficult to remove from the housing as it had swollen out of shape and the filter element had spilled out of the bottom. A disctinct bow can be seen in the top of the filter. The discolouration and distortion of the plastic suggests the body is made of something that is not very diesel resistant.
I have posted large pictures to make the swelling and distortion clear.
I just hope the swelling has not fractured the filter housing
This particucular one was bought from ECP about four months ago and has seen no more than about 900 miles use as the car is very lightly used.
So, if you have one of these in your car get it replaced very rapidly. If you are offered one refuse it! The brand-new example I still have will be thrown away pronto.
It has now been replaced by a traditional metal type.
I'm worried now as all my fleet have Hengst oil filters fitted. They are going to be changed tomorrow.
Any one else seen anything like this?




