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OK. I must be an idiot. I have a 99 F250 4x4, 7.3L diesel. I don't where the vacuum pump is and I am to cheap to buy a shop manual. I have looked and the belt does not power anything that looks like a vacuum pump. On the passenger side, directly behind the battery is what appears to be a vacuum tank. Behind that an electrical unit with a small vacuum line to the tank, this item is mounted to the firewall and has a round piece sticking out a few inches. If this truck has an electric vacuum pump, I think that may be it, I hope so. It would be an easy change.
If you guys can get me through this you will have proven your superiority of truck repair.
I've got a '99 PSD and the electric vacuum pump is on the passenger side, right where you thought it was. It controls vacuum to the ESOF and also runs the door on the HVAC fan.
The wife got tired of my nonsense. She called the dealer. This has an electric pump, located on the passenger side behind the vacuum tank. The fuse box is on the drivers kick panel. I will probably get this fixed at some point. I will not quit trying. I love this truck.
I took it to the dealer and got ripped a new hole in the wallet. It turned out to not be the electric pump, located on passenger side firewall. It was some kind of valve assembly.