Duramax Diesels Forum Truck of the Week
  #16  
Old 03-07-2017, 11:36 PM
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Well I ordered a set of 100% exergys I hope they work out. I am going to redo the filter setup and the cp3 supply lines to rule any of that out.
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  #17  
Old 03-08-2017, 06:25 AM
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You will enjoy it!
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  #18  
Old 07-17-2017, 05:44 AM
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An update this season. I am running 100% over exergy injectors with the same 12mm pump and will still drop actual rail down to 22000 psi when commanding 26000 during a pull. Pulse is at 2300us. 1/2 inch feed all the way to the pump. Holding 2-10 psi during a run.
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  #19  
Old 07-17-2017, 06:54 AM
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Could be a bad pump. Only way to know is to have it tested.
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  #20  
Old 07-17-2017, 07:12 AM
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So I am assuming you think the pump should hold 26000. It seems to do better when rpm is 3300 and under but once past 3700rpm sustained when I'm pulling is when it drops.
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  #21  
Old 07-17-2017, 07:23 AM
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The pump is rated to 4500 rpms. Do you have a sump? Either something is causing a restriction or the pump has a problem.


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  #22  
Old 07-17-2017, 08:11 AM
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I do not have a sump pulling from stock pickup. I'm keeping positive lift pump pressure though.
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  #23  
Old 07-17-2017, 08:18 AM
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What's lift pump pressure during this?
I think that's your restriction. What size lift pump?


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  #24  
Old 07-17-2017, 08:33 AM
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It's a ppe 160. Lift pump will drop to 2 psi but will stay positive pressure.
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  #25  
Old 07-17-2017, 09:12 AM
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Quote:
Originally Posted by greendury View Post
An update this season. I am running 100% over exergy injectors with the same 12mm pump and will still drop actual rail down to 22000 psi when commanding 26000 during a pull. Pulse is at 2300us. 1/2 inch feed all the way to the pump. Holding 2-10 psi during a run.
My 12mm is holding 29,000 psi on 1800ish pulse with 200% overs. Just for comparisons sake.
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  #26  
Old 07-17-2017, 10:25 AM
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Quote:
Originally Posted by greendury View Post
It's a ppe 160. Lift pump will drop to 2 psi but will stay positive pressure.


Get a good lift pump. And put a sump in it.


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  #27  
Old 07-17-2017, 10:32 AM
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Quote:
Originally Posted by IOWA LLY View Post
Get a good lift pump. And put a sump in it.


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X2 2psi is not even close.
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  #28  
Old 07-17-2017, 10:38 AM
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The same lift pump filter setup supported duel fuelers on 80% injector running a 2800us with out dropping rail so i figured it would be sufficient for my current setup. But agree sump and bigger lift pump is a good place to start.
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  #29  
Old 07-17-2017, 12:48 PM
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Can't you test the return rate of a stroker pump to find out if it's bad? I won't be throwing parts at this without knowing the CP3 good.


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  #30  
Old 07-17-2017, 01:55 PM
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Hook a 5/8 hose to the vent inside your fuel pick up and run that down into the cup. Hook your feed line to the vent. You'll be shocked how small the opening is in the cup.
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