Vacume pump

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Author Message   Darryll Mills (Emnat) Member Username: Emnat Post Number: 43 Registered: 11-2003 Posted on Tuesday, December 30, 2003 - 08:28 am:    How do I test the vacume pump to see if it is working?? Should I hear it working when the truck is runnng??   Bazzle (Bazzle) Member Username: Bazzle Post Number: 70 Registered: 09-2003 Posted on Tuesday, December 30, 2003 - 04:19 pm:    300TDI?? with engine idleing remove hose off outlet and put finger on pump hole. You will feel it suck . Bazzle   Darryll Mills (Emnat) Member Username: Emnat Post Number: 48 Registered: 11-2003 Posted on Tuesday, December 30, 2003 - 10:31 pm:    I have the V8i So what I am hearing is with the engine idling or at any rpm's the vacume pump is always pumping!!!