My question is, do I need to have the checkvalve in my main vacuum line installed for the booster to work properly. My valve broke over the weekend and I MacGuyvered in a PCV valve. That worked for one day but just crapped out, now I need to know if I can do without it until I get a new main vacuum pump hose. I'm not running any vacuum to anything else except booster and shutoff valve. I long ago disconnected all other vacuum draws on the car. I only need vacuum for the booster and pump shut off.

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1981 240d
Newport,RI