Strange pumping noise when engine is ...

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Author Message   Christian Kiely (Redrover47) New Member Username: Redrover47 Post Number: 3 Registered: 09-2003 Posted on Friday, September 12, 2003 - 03:17 pm:    Yesterday morning after my 20001 D2 had been sitting in the garage overnight, I went to add washer fluid and noticed a very soft "pumping noise" coming the vicinity of the ABS unit, even though the truck was not running. Is this normal? Any thoughts? Thanks in advance.   Nathan Cooper (Cooper) Member Username: Cooper Post Number: 60 Registered: 10-2002 Posted on Friday, September 12, 2003 - 06:46 pm:    key on or off?   Christian Kiely (Redrover47) New Member Username: Redrover47 Post Number: 4 Registered: 09-2003 Posted on Friday, September 12, 2003 - 10:34 pm:    key off, out of ignition, truck off for several hours   Ron L (Ronl) Member Username: Ronl Post Number: 171 Registered: 11-2002 Posted on Saturday, September 13, 2003 - 12:38 am:    put your ear on the ABS unit, you should hear something. Its normal.   noel Bond (93dico) Member Username: 93dico Post Number: 66 Registered: 06-2003 Posted on Monday, September 15, 2003 - 06:43 am:    Disco Mice ??