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  #1  
Old 04-21-2012, 08:45 AM
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Vac Line Leak

Hey! So today I had a trailer on the back (not much 6k or so). Got into some wet dirt on a grade went to use 4x4. Hubs didnt go in. I had to munualy lock - all was well got out of the grade.

Now.... I clearly have a vac leak. Checked all the lines, all is good. I know there is a vac issue cause I can let it build, it will engage but then come out after a minute. I can hear/see the pump going ape crap too.

Only concern.... I have been working 60 hours a week. Needed new wheel u joints, didnt have the time to do them (did these on my 03, know how fun they are )

So I had someone do them. All is good. With that.


So I traced the lines, cant find a leak or issue.

Any ideas?
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Old 04-21-2012, 09:16 AM
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I'm having same issue I was told to take hubs apart clean & lube have not had time to do yet I'll let u know if it helps
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Old 04-21-2012, 11:23 AM
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I think I need to do an o-ring kit in the hubs. That makes sense to me......
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Old 04-21-2012, 11:27 AM
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the vacuum to lock the hub is only a short burst around 40 seconds after that it shuts off via the Solenoid near the pump ,, the pulse to unlock is much shorter and the vac strength also is varied for each signal ..

best way to test is with a tester ,,

ps if your doing the u joints there is another 60$ seal at the knuckle that can also be your source of a ESOF failure
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Old 04-21-2012, 03:53 PM
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How often should i hear the pump running? I will open up my hubs tomorrow. But I wonder if my pump is failing?
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Old 04-22-2012, 07:23 PM
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Update:

Took hubs apart. Cleaned and greased. Did a vac test. Super slow bleed off. Like went from 20lbs down to 10 in 3 to 5 min or so. (and both sides exact same)

Got in and drove, it engaged and then dis engaged within 20 seconds or so.

When I am in 4x4, I lose all vac quickly (20 seconds or so). AC switches stop working. Put it back in 4x2, build pressue switches work all day long.

So..... Few questions.

1. Does my hub bleed off sound normal? Super slow bleed off.

2. Does this sound like a bad line (between pump and hub). Its 10:30, I didnt have time to vac test all the lines just yet. (need to locate which is which anyway and sooo dang tired).

Let me know!
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Old 04-23-2012, 05:40 AM
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Ok a friend got into a manual, my hub vac pressure is well within spec.

Now, I need to track down whats bad... A line, the pump, or the canister. Anyone else have to do this that could save me time and tell me what to look for?
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Old 04-23-2012, 06:56 PM
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Does the Solenoid near the pump ever fail? Is it exclusive for the 4x4 and is it the one that is closer to the fender with the lines going to and from it?
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Old 04-24-2012, 06:47 AM
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my pump is fried. I guess the piston inside wears out after a while and doesn't work as well anymore. I have not had in cab 4x4 for a long time because I am too lazy to buy a new pump for the three times a year i need 4wd.
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Old 04-24-2012, 06:49 AM
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Thanks Bake! I am going to check my lines AGAIN and then go after other stuff. Does anyone have partnumbers for the pump and the solioid?

Peace!
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