Little black pump right side of engine bay???

[Hoss350]

What is this? It's like a vacuum pump or something, mine now stays on all the time. I't just started doing this recently?

Thanks
Hoss

[bfloyd4445]

Originally Posted by Hoss350

What is this? It's like a vacuum pump or something, mine now stays on all the time. I't just started doing this recently?

Thanks
Hoss

?????....dunno....can you post a pix and a better description of where it is? I don't see one under my hood

[dhanna6powerstroke]

Originally Posted by Hoss350

What is this? It's like a vacuum pump or something, mine now stays on all the time. I't just started doing this recently?

Thanks
Hoss

It's the motor that supplies vacuum to the Auto locking hubs

[Hoss350]

That's what I was thinking it is, so why would it be running constantly? I followed the vacuum lines down, and they all appeared to be hooked up.

[symbols]

Most likely they are rotted at the hubs. Very common....

[bfloyd4445]

Originally Posted by symbols

Most likely they are rotted at the hubs. Very common....

didnt know that. I have used and owned Ford vehicles equiped with this feature since maybe 1987 and have never had a problem with them at all. Thanks for the info. I have heard of problems with this system before but didn't even know they were vacum operated.