The RPM relay will run the pump even if your engine is turning over very slowly. If it didn't you could not start the car with a weak battery after you lost all rest pressure (overnight). > The problem is that the pump is not energized until the engine > is turning a certain number of RPM's. I don't know the exact number, > but it's more than the starter motor alone can yield. That's where hot > start problems come from. The cold start injector is electrically > operated, so it can spray before the system is up to primary pressure. > But the cold start injector does not spray into an already warmed up > engine, > > Bill Robertson > #5939 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/dmcnews Yahoo! 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/