Compression Ignition Addict
Join Date: Nov 2009
Location: Branson, Missouri
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Vacuum Pump Running too much...
(posted this in "general" but as usual, less traffic there...)
I posted a question about a strange noise coming from under the dash on the driver's side and didn't get very far with it. Couldn't hear it over the engine noise with the door open, so I couldn't search for it. Today, I was loading a tune and when I keyed it "on", the noise started without the engine running, which was a first. So I open the hood and its the little vaccum pump. I considered that before, but it wasn't running when I was investigating. So while I loaded my tune, it ran the entire time. I traced the hose best I could, and couldn't find any obvious leaks.
There is a unit with vaccum lines on it right by the passenger side battery. I read something in an old thread about a VACUUM CANISTER. 1) Is there supposed to be a bottle on the bottom of that unit by the right battery? If so, that explains why the pump keeps running. I'm learning quite a bit about diesels and vehicles in general since I bought this truck, but never got much into vacuum stuff.
2) Should the pump really be THAT loud that I can hear it in the cab?
3) Also, what all does this vacuum pump control?
This is really driving me nuts. Someone please give me some info. Thx.