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

Thread Tools
 
Search this Thread
 
  #11  
Old 09-09-2013, 07:34 PM
turbo2332's Avatar
Diesel Bomber
Join Date: Jun 2011
Location: Indiana
Posts: 2,171
Received 104 Likes on 101 Posts
Default

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.
 
  #12  
Old 09-09-2013, 07:43 PM
AMS247's Avatar
Diesel Fan
Thread Starter
Join Date: Aug 2013
Posts: 88
Likes: 0
Received 4 Likes on 4 Posts
Default

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...
 
  #13  
Old 09-09-2013, 07:57 PM
JBearSVT's Avatar
Diesel Bomber
Join Date: Oct 2010
Location: New England
Posts: 1,325
Likes: 0
Received 59 Likes on 58 Posts
Default

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.
 
  #14  
Old 09-10-2013, 10:59 PM
4x4manonbroke's Avatar
Diesel Bomber
Join Date: Jun 2010
Location: Tacoma
Posts: 3,202
Received 142 Likes on 136 Posts
Default

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
 
  #15  
Old 09-11-2013, 04:19 PM
JBearSVT's Avatar
Diesel Bomber
Join Date: Oct 2010
Location: New England
Posts: 1,325
Likes: 0
Received 59 Likes on 58 Posts
Default

That dual feed ain't a half bad idea. I like it.
 
  #16  
Old 09-11-2013, 05:48 PM
H.R.D's Avatar
Super Moderator
iTrader: (3)
Join Date: Dec 2010
Location: Las Cruces, NM
Posts: 3,763
Received 1,052 Likes on 557 Posts
Default

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; 09-12-2013 at 07:08 PM.
  #17  
Old 09-15-2013, 07:25 AM
AMS247's Avatar
Diesel Fan
Thread Starter
Join Date: Aug 2013
Posts: 88
Likes: 0
Received 4 Likes on 4 Posts
Default

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?
 
  #18  
Old 09-15-2013, 05:48 PM
4x4manonbroke's Avatar
Diesel Bomber
Join Date: Jun 2010
Location: Tacoma
Posts: 3,202
Received 142 Likes on 136 Posts
Default

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 ....
 
  #19  
Old 09-15-2013, 05:51 PM
hjump's Avatar
Diesel Fan
Join Date: Sep 2013
Posts: 20
Likes: 0
Received 0 Likes on 0 Posts
Default

Can a bad lift make the engine rev up and down at idle along with a slightly dead pedal?
 
  #20  
Old 09-15-2013, 05:59 PM
4x4manonbroke's Avatar
Diesel Bomber
Join Date: Jun 2010
Location: Tacoma
Posts: 3,202
Received 142 Likes on 136 Posts
Default

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 .....
 


Quick Reply: Tired of the BS with upgrading mechanical lift pump



All times are GMT -5. The time now is 11:21 PM.