I have a 2003 F150 5.4 Triton, I'm trying to identify this part. It has a suspected vacuum leak. This hook in intake tube in front of throttle body and loops around to the firewall on drivers side and then hooks into what appears to be the back of intake. The part is is small canister or cylinder looking part, indicated in pics by the white stick.
Thanks for any Help.

 

I think I have answered my own question. This part is apparently called a resonator, its NOT a vacuum reservoir. Its purpose was to help dampen the sound from the throttle. At sometime Ford decided this part is not needed and deleted it. So if you go to an auto parts store you won't be able to find a new one, I tried and they said it didn't exist. So my fix for it was to take it off the truck and replace with a length of about 3 ft of 3/4 inch hose. Truck runs great and vacuum leak is gone.

And this part in question is just an empty hollow canister.

Hope this helps someone else.