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Vacuum pump ?
It's a 99 powerstroke. 65k miles. 4x4 dually F-350
The vacuum pump runs continuiously. Traced lines from canister to a switch(?) just adjancent to the canister. Unplug vacuum lines from the switch and plug line and pump stops. This switch has a 3 conductor plug attached to it. What is this part? What does it do? What controls it and where does it gets it's signals.
The switch has 2 vacuum ports. One of which will not or does not close and thus makes the pump run.