Have you determined how they are failing? Open circuit in the motors? Sparks like normal when you connect it to a power source but the motor won't run? Is the motor running but no fuel is being pumped?
If the motor runs but you get no fuel, you may be replacing just the pump inside the housing. That housing will have a pickup screen that can collapse or get plugged.
If the motor doesn't run but there is a spark when you connect it, the impeller may be getting stuck. Chrysler used to have a problem with that. By about the fourth or fifth pump in a couple of months, you buy one from the dealer and have no more problems. In fact, it wasn't that the pump came from the dealer. It was that the microscopic debris in the tank had all been collected in the previous pumps and any new one would have worked. Chrysler pumps are built with very close clearances to make them quiet but that leads to the impellers locking up from that debris. The cure is to have the tank steam-cleaned at a radiator repair shop, then install the new pump.
If you can't hear the motor run, connect it externally to a battery before removing it from the tank. If it does run that way, suspect a poor ground or bad connection in the 12 volt feed wire. Those can be irritated enough to make them work for a while when you remove the pump.
Friday, June 29th, 2012 AT 7:54 PM