noise under hood w/t key off

[Brad Clayton]

Anyone know what the faint buzz/hum is under the hood with key in off but not lock position. We leave all the vehicles in our bays in nuetral when working on them so the key is not in the lock postion. Two trucks exhibited dead batteries over the weekend that were in the shop due to this.

 

I remember a broadcast message for the Focus when it was introduced saying that if key was left in ignition even in the lock position that the battery would discharge but I have never seen it happen.

[DieselD]

fuel coolant pump?

[Keith Browning]

I thought the fuel cooler pump will only run for 10 minutes max after shut down? But this is an abnormal condition I suppose. I do know that the EGR valve makes a faint high pitched sound KOEO.

[Alex Bruene]

One of the first 6.4s we saw at our dealer had a terrible squeal from the fuel cooling pump. Turned out that the level was low and needed to be topped off and bled. There was a broadcast message released about the exact issue early this week.