The accumulator does not have a bypass. That extra hose is to return fuel if the rubber diaphragm leaks or is ruptured. Your dealing with a very small volume of air in your test. You will need to use pipe sealer or Teflon tape on your connections to get reliable results. If these are done you should get days, weeks or longer before you see any drop in pressure. --- In dmcnews@xxxxxxxxxxxxxxx, mike clemens <rmclemns@...> wrote: > > I have been toying with the idea of testing an accumulator off the car, but found no definitive way in any forums, so I devised a test of my own. Please look at this and see if there are any flaws in my thinking or test. ------------------------------------ To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnewsYahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dmcnews/join (Yahoo! ID required) <*> To change settings via email: mailto:dmcnews-digest@xxxxxxxxxxxxxxx mailto:dmcnews-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/