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data-bvcsref="http://answers.grainger.com/answers/5049-en_us/product/4F742/subscribeanswers.htm?format=embeddedrpc&contentid=83972&answers=true&user=__USERID__&authsourcetype=__AUTHTYPE__" data-bvtrack="eventTarget:Product,eName:ProductFollow" data-bvcsappcode="qa" name="BV_TrackingTag_Question_Display_SubcribeContent" class="BVDILink BVDI_CSSubmitLink" data-bvcssubjectid="4F742" href="javascript://" data-bvcssubjecttype="product"><span class="BVDILinkSpan">I have this question too</span></a></div></div> <div class="BVQAQuestionAnswerDivider"><h2 class="BVQAQuestionAnswerDividerHeading">Answers </h2></div><div id="BVQAQuestion83972Answers" class="BVQAAnswers"><div id="BVQAAnswer102556" class="BVQAContent BVQAAnswer BVDI_BAContentTechSupport"><div class="BVDI_BA BVDI_BAAnswer"><div class="BVDIInside BVDI_BAInside"><div class="BVDIBody BVDI_BABody"><ul class="BVDI_BAList"><li class="BVDI_BAItem BVDI_BAItemOdd BVDI_BAItemTechSupport"><a onclick="return false;" class="BVDILink BVDILinkDisabled" title="Tech Support" id="BVDI_BABadge_9k98vx5x5p4csvvvwm23dwlqa_ID"> <span class="BVDILinkSpan">Tech Support</span></a></li></ul></div></div></div><div class="BVQAContentText BVQAAnswerText"><div class="BVQAContentLabel BVQAAnswerLabel">Answer: </div>Hello,<br />Not knowing what you are hooked to, I would think if you are loosing vacuum because you have a check valve in the system that is not functioning.<br />I would look over the old pump to see if there is a check valve still attached to it.<br /><br />I hope this answers your question, thanks for using Grainger Ask & Answer!<br /><br />Wadeh</div><div class="BVQAContentData BVAnswerData"> <div class="BVQAElapsedTime">5 months, 1 week ago</div><div class="BVQASignature"><div class="BVQAWrittenBy">by </div><div class="BVQANickname"><a title="Read all my Q&A" data-bvtrack="eName:ProfileLink" onmouseout=" bvProfileSnapshot.hideOpenPopinAfterDelay(1000 ,250 ); " name="BV_TrackingTag_Answer_Display_ReadAllQA_Wadeh" 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