Vacume pump info?? - Ford Powerstroke Diesel Forum

 
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post #1 of 8 Old 09-12-2011, 06:57 AM Thread Starter
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Vacume pump info??

I haven't quite found the answers I am looking for so can some one help sort this out for me please? On my E99 I can turn my 4x4 on and I have no issues with my defrost or vents etc... but the vacume lines going to my front end are ripped and just hardly hanging there (noticed it this past week).Is there some sort of bypass that was probable done and I just don't know what to look for? My 4x4 works if I lock the hubs in (which is how I like it) but I have read where when it goes bad people's vents/defrost etc works funny? Not sure if I should replace the bad lines or just pull them off completely. Thanks for any info

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post #2 of 8 Old 09-12-2011, 08:47 AM
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The lines that go to the hubs only affect the vacuum for putting in 4x4 when keeping hubs on auto. You could put these on and be done forever. http://www.dieselsite.com/1999-2004f...ofhosekit.aspx

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post #3 of 8 Old 09-12-2011, 09:22 AM Thread Starter
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Explain, "By keeping it on auto" please. I am guessing that hubs locked or unlocked I can be going down the rd and just flip the switch to 4H and it is supposed to lock in, right? Which is the same as leaving the hubs locked in and flipping the switch to 4H when I need it, right?

Those braided lines are pretty nice but I think what I am trying to ask/find out is exactly how this set up is supposed to work. Thanks.

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post #4 of 8 Old 09-16-2011, 08:16 PM
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Price out Earl's braided lines at Summit Racing. Can do the hoses cheaper yourself.
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post #5 of 8 Old 10-10-2011, 02:14 PM
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You are right about how the system works. If you lock the hubs manually you can shift in and out of 4x4 at any time. If you have them unlocked, which says auto not unlock on the hub they will lock when they have vacuum applied to the hoses. replacing the hoses will restore that function. In 2wd the heater should not be affected, but in 4x4 with the hoses torn your heater will probably have problems diverting air. That is unless someone has plugged the lines with something.

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post #6 of 8 Old 10-10-2011, 06:09 PM Thread Starter
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Well I went out and looked at it again and this is what i found. The vacume lines from the hubs to the top of the shock where it attaches to the plastic line is gone/dry rotted. From there on everything is complete all the way to the pump. Now obviously the 4x4 doesn't auto lock but if i manual lock the hubs the 4x4 works fine AND nothing negative happens to the ac/heat etc....

I am gonna fix the lines and just leave it be. One more question, manual or auto. We can "shift on the fly" right? Thanks.

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post #7 of 8 Old 10-10-2011, 06:36 PM
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Yes, You can shift on the fly. Make sure you are getting vacuum to the hubs when you fix the lines, engage at a stop once or twice, just to make sure. If the hubs don't lock the t-case will grind. Also make sure that the hubs unlock. When they stick it really kills your mileage

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post #8 of 8 Old 10-11-2011, 05:11 AM Thread Starter
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Cool, thanks for the help!

NAME: Justin


A little bit of this and a little bit of that. I want a lot more of this and a lot more of that It never ends!
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