What is this and why is it always running? - Ford Powerstroke Diesel Forum
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Old 10-15-2013, 01:39 PM
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What is this and why is it always running?

What is this and why is it always running?-imageuploadedbyautoguide1381869486.515193.jpg

I believe this is the vacuum pump but I'm not sure. It runs constantly when the key is in the run position. Whether or not it's supposed to I don't really know, but it's pretty loud, it isn't like that in the other 7.3 we have.


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Old 10-15-2013, 01:49 PM
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Yes it is. Should turn off once vacuum has built up. Mine runs for a little most of the time I turn the key on. Maybe you have a vacuum leak.
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Old 10-16-2013, 05:31 AM
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How would I find a vacuum leak if I had one?


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Old 10-16-2013, 06:12 AM
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first pull off the line and plug it with your finger, the pump should shut off , if not replace the pump. look under the dash around the heater box and control lines ,they usually leak there. look for loose fitting and dry rotted rubber
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