Payne, As you probably know is a safety cut off switch for the fuel pump. When the plunger is up, the switch is off and the pump won't run. Down and if the switch is good the pump will run. You can hold the switch in one hand and gently tap it against the other hand and the plunger should pop up. It should sound as if a metal ball is rolling around inside. If it doesn't, then is most likly defective. It should take just a little pressure to push it back down. I do have a couple of good used ones. John Hervey www.specialTauto.com --- In dmcnews@xxxx, "Payne" <bpayne@xxxx> wrote: > I've heard a lot of mention about using your inertia switch as a security > device. Good idea except that my little plunger doesn't stay up by itself. > I can pull it up as far as I can but it just falls right back down. Is this > normal? Is there only certain circumstances where it will stay up by > itself? > > Thanks! > > Payne > #2975