vacuum in diesel filter?
went to drain off the diesel fuel filter on my focus 1.8 tdci, instead of the expectant water/diesel from the drain valve it started to suck in air!!
what would cause it to vacuum in the filter housing?
I have been having poor idling issues lately, maybe this has been the cause. Engine runs great, no smoke, plenty of power no hesitation. A new filter was fitted less than 10,000 miles ago. Any ideas would be appreciated.
RM
September 2013