I don't know. I know you need one for a climate control system operating off of engine vacuum to keep the vacuum from bleeding back into the engine. With a dedicated pump instead of the engine I would think not but I could be wrong. It's cheap and easy to add one if necessary.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.