Hi i bought a neglected passat b5 1.9tdi few months ago, im tracking some problems caused by the old mechanic who serviced it. So the engine i have is a AJM 115cv.
The problem i have is the diesel filter is not the original, its running without the check valve.
I want to put a diesel filter with the check valve. BUT my engine originally used a filter with a screw-on filter, but im missing the top portion where the filter screws to.
My question is can i use the new filter with the valve, will it work the same as the screw on? Does the screw-on filter housing incorporate a check valve? Did it fail and that was why it was removed?