12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

Tired of the BS with upgrading mechanical lift pump

Old Sep 9, 2013 | 07:34 PM
  #11  
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get an air dog and be done. these internet haters have got you scared. they are probably 16 year olds with a truck daddy bought them and dont have a clue as to what they are installing.
 
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Old Sep 9, 2013 | 07:43 PM
  #12  
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Originally Posted by turbo2332
get an air dog and be done. these internet haters have got you scared. they are probably 16 year olds with a truck daddy bought them and dont have a clue as to what they are installing.
Oh I would agree with you there as some of these guys I see going through an intersection practically pouring raw fuel out of their exhaust with how unbalanced their Air/Fuel ratio is.

That may be the case, I definitely am scared because of all the bad rep I've read about the problems with the electric lift pumps...
 
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Old Sep 9, 2013 | 07:57 PM
  #13  
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I've read lots of problems with the stock mechanical one too, but mine is still putting 30psi through the filter at 3K. Granted, I don't know how it would be at 3500, but... regardless *disclaimer* I only read the first article, however, that article seemed to be making a very strong case that the reason why the factory LP is so inefficient actually has nothing to do with the LP at all, but with the rest of the fuel system. Maybe I need to read the others, but they seem pretty adamant that the LP isn't actually the problem.
 
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Old Sep 10, 2013 | 10:59 PM
  #14  
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seriously .... if your fuel pump and injectors are mostly stock a FASS or a raptor or even a Holley should be just fine .... any fuel pump ever built .... has its breaking point and yes ALL PUMPS WILL FAIL .

especially if you winding it up to 4K freequently .....

you could also run dual feed and be done with it ... one regular and one electric ... what the guys with duals do all the time .... seen it with my own eyes...... put a valve between in feed on both and your safe .... if the electric fails close the valve and stay off the stupid pedal ..... fix electric and al is better ... no big deal ..... also run some sort of lubricant in your fuel ... will help keep pump happy for longer
 
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Old Sep 11, 2013 | 04:19 PM
  #15  
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That dual feed ain't a half bad idea. I like it.
 
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Old Sep 11, 2013 | 05:48 PM
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I have being running an AD 100 for about 8 years now, no issues whatsoever. All I have done to it is changed filters and a relay in those 8 years.
 

Last edited by H.R.D; Sep 12, 2013 at 07:08 PM.
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Old Sep 15, 2013 | 07:25 AM
  #17  
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Originally Posted by H.R.D
I have being running an AD 100 for about 8 years now, no issues whatsoever. All I have done to it is changed filters and a relay in those 8 years.
H.R.D, That's good to hear! I guess all these guys burning up their lift pumps are pushing them to max fuel all the time?... which I won't be doing.

4x4manonbroke, when you say to run duals, do you mean in parallel? Having two systems independent from one another that join in a Y connector to the fuel pump so you can shut one down if one fails?
 
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Old Sep 15, 2013 | 05:48 PM
  #18  
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Originally Posted by AMS247
H.R.D, That's good to hear! I guess all these guys burning up their lift pumps are pushing them to max fuel all the time?... which I won't be doing.

4x4manonbroke, when you say to run duals, do you mean in parallel? Having two systems independent from one another that join in a Y connector to the fuel pump so you can shut one down if one fails?
yes running duals leaves you with a " limp home mode " so to speek ... just cant get "full power " ..... and yes running in parallel is what a lot of pullers are doing ... just that little bit to get ya over the hump so to speek ... or run dual electrics .... either way ....
 
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Old Sep 15, 2013 | 05:51 PM
  #19  
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Can a bad lift make the engine rev up and down at idle along with a slightly dead pedal?
 
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Old Sep 15, 2013 | 05:59 PM
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bad adjustment of the solid cable or just a bad pump yes ..... fluctuations in fuel pressure to injectors or possibly even a tired IP also ..... gonna need Psi numbers to help more though .... what is the inlet fuel pressure @idle and WOT .....
 
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