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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 11-12-2012, 10:33 PM   #1 (permalink)
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Vacuum Pump

Hey guys,

So I think my vacuum pump is going out yet again. This will be the 4th time I've replaced it... Seems to be a yearly thing. Ive been buying the pump that napa stocks. Anyone else have this issue? Any suggestions on things to check or another brand pump I should try?

Thanks in advanced

Taylor
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Old 11-13-2012, 08:17 AM   #2 (permalink)
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My advice is "never buy anything reman from Napa, you will regret it"

What brand is the one you've been getting? Napa?
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Old 11-13-2012, 10:36 AM   #3 (permalink)
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Its just the 'NAPA Vacuum pumps' Brand. It even says it has a 12 month warranty. Now id just have to find my receipt or pony up and buy a new one from somewhere else. Any suggestions on a good brand that might last?
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Old 11-13-2012, 10:44 AM   #4 (permalink)
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The Napa rebuilt pump I installed 3 years ago in a KOA in Shasta City is still working fine. Because we were on the road, I didn't want to chance no brakes going into Oregon/Washington. I replaced a Cardone from O'Reilly's and it's still good. Turned out low fluid level in M/C was causing light.
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Old 11-13-2012, 11:01 AM   #5 (permalink)
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I have had very bad luck with assorted reman parts from Napa and of the many mechanics I've spoken to about it, it's not uncommon. But it's not impossible to have good luck either.
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Old 11-13-2012, 11:10 AM   #6 (permalink)
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Quote:
Originally Posted by chuckster57 View Post
The Napa rebuilt pump I installed 3 years ago in a KOA in Shasta City is still working fine. Because we were on the road, I didn't want to chance no brakes going into Oregon/Washington. I replaced a Cardone from O'Reilly's and it's still good. Turned out low fluid level in M/C was causing light.
Me too, my Napa is about exactly the same age, still going strong. My original was still working fine, but after 18 years I figured its lifetime was about up. The Napa water pumps seem OK too, I always get 80,000+ out of one.
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Old 11-13-2012, 12:47 PM   #7 (permalink)
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So I just threw my vacuum gauge on the pump and with nothing else between the pump and gauge I'm getting about 19 in Hg. If I remember that should be up around 25 correct?
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Old 11-13-2012, 01:10 PM   #8 (permalink)
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At the brake booster I'm getting 18 in Hg. and with the A/C on I'm getting 17 in Hg. seems like i may have a little leak and a weak pump. Any thoughts?
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Old 11-13-2012, 02:34 PM   #9 (permalink)
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"Gauge should read 70 kPa (21 inches Hg) at sea level within 30 seconds"
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Old 11-13-2012, 03:07 PM   #10 (permalink)
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sounds like that is my problem yet again. the other times it just completely stopped making vacuum or was very sputtery and inconsistent. Sounds like my pump is just getting weak.
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Old 11-13-2012, 07:22 PM   #11 (permalink)
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I can't tell you it's because you're buying cheap pumps from Napa, but I wouldn't do that myself, even if it's worked out for other people. I believe mine is original, but I don't know for sure, and I sure haven't replaced it, so I don't have anything more interesting to tell you than that unless you want to know more about the vac troubleshooting procedure.
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