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Duramax First Generation: 2001-2004 (LB7) Discuss the first generation (2001-2004 LB7) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.


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Old 04-25-2017, 10:39 PM   #1 (permalink)
04dmax88
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New cp3 no start, not filter housing

Just replaced cp3 on my 2004 lb7, only desided to change since truck just hit 300k and that is the only part in fuel system i havent replaced yet ( thinking id change it before i had issues) surprising it was the original pump! I have everything back together and truck will not start. Not holding prime. I have checked every connection and there is no signs of leaks. I have pumped and cranked 6 times now. Nothing! With ignition key on the air dog makes primer rock hard, once i turn key off i lose prime fairly quick. No visible leaks. Tried spraying a little starting fluid in intake, still nothing

I have read many threads with same symptoms, but ends up being filter head or leak in lines somewhere. I have zero fuel leaking. So far i have bypassed filter head and disconnected return line at firewall to confirm cp3 is pumping/no clogs. 1/2 tank of fresh fuel aswell. Any further ideas?

I would suspect it to be an electrical issue due to not firing when starting fluid was used, except im losing prime..

Truck has edge cts, k&n intake, 5" straight pipe

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Old 04-25-2017, 10:44 PM   #2 (permalink)
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Quote:
Originally Posted by 04dmax88 View Post
Just replaced cp3 on my 2004 lb7, only desided to change since truck just hit 300k and that is the only part in fuel system i havent replaced yet ( thinking id change it before i had issues) surprising it was the original pump! I have everything back together and truck will not start. Not holding prime. I have checked every connection and there is no signs of leaks. I have pumped and cranked 6 times now. Nothing! With ignition key on the air dog makes primer rock hard, once i turn key off i lose prime fairly quick. No visible leaks. Tried spraying a little starting fluid in intake, still nothing

I have read many threads with same symptoms, but ends up being filter head or leak in lines somewhere. I have zero fuel leaking. So far i have bypassed filter head and disconnected return line at firewall to confirm cp3 is pumping/no clogs. 1/2 tank of fresh fuel aswell. Any further ideas?

I would suspect it to be an electrical issue due to not firing when starting fluid was used, except im losing prime..

Truck has edge cts, k&n intake, 5" straight pipe
You must be throwing some codes? what are they?

I'd stay clear of starting fluid with these engines - I've heard bad things can happen.

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Old 04-26-2017, 08:24 AM   #3 (permalink)
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Something as expensive as a CP3 to replace just for mantinance is unheard of. If that's all that was done put your known good one in.
The only thing electrical with your CP3 is your FPR valve. Is this plugged in?
GM Part 97728979 FPR, REGULATOR KIT, Fuel Injection, REGULATOR KIT,FUEL PRESSURE(PART OF 1
Did you disconnect your batteries? You didn't short out your TCM?
It takes approximately 2500 PSI rail pressure to start.

High Pressure Injection Pump (CP3 Pump)

Before condemning the pump for a starting issue you need to be certain that the high pressure fuel system is not leaking the pressure. Perform the injector return flow test.
If there has been a major contamination issue with dirt and or water then it is very likely that the high pressure pump will need to be replaced. However, the injectors are typically damaged first, but any contamination that got into the injectors went through the CP3 pump first.
The most common failure of the high pressure pump is the inability to keep up with high fuel demand such as towing a trailer up a hill. This problem will usually set a low rail pressure code.
Other Notes:
• If the vehicle has starting issues then the injectors are the most likely cause. Perform the injector return flow test.
• If the vehicle only acts up during a hard pull with a load and there are no restriction issues then it is more likely a HP pump causing the problem. A limit valve could also cause this problem.

No Start or Hard Start

Excessive fuel restriction, check or change fuel filter
Use vacuum gauge, check the suction, you should have no more than 5 inches Hg at WOT (wide open throttle) or 7-8 inches Hg under load. If you have too much suction, after changing the filter, the restriction could also be the sock in the tank. Too little vacuum (less than 2 inches Hg) means that it could be sucking air.
Check for air in fuel system, install clears lines before and after the filter housing to check for air in the lines.
Confirm actual versus desired rail pressure, even under crank no start conditions
If the above are ok, then it comes down the following.
a. fuel injectors (see injectors for more diagnostic information)
b. high pressure injection pump
c. Fuel pressure regulator, check to make sure it is not stuck.
d. fuel pressure relief valve (high pressure limit valve), check to make sure it is not leaking into the return system when rail pressure is 160 MPa
Before condemning the high pressure pump you need to make sure there are no high pressure fuel leaks. Use the EN-47589 (same block-off caps as #9011 SPX Miller tools) cap set to cap off the injector rail to isolate the injectors from the injector return system.
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Last edited by Ramblinrodney; 04-26-2017 at 08:39 AM.
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Old 04-26-2017, 09:34 AM   #4 (permalink)
04dmax88
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No codes listed on cts. What is proper technique for bleeding fuel system after cp3 install?
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Old 04-27-2017, 11:02 PM   #5 (permalink)
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Disconnected lines around cp3 and filled them with diesel. Reassembled and it fired right up! Mustve had air stuck in there. Btw truck runs way better now with new cp3. Idle is Much more smooth and a considerable amount of power gained back. 300k on old cp3 definitely had taken its toll. I disagree with waiting to replace it until i had issues. Especially due to mileage on truck, hard to believe its unheard of...but what do i know
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Old 08-13-2019, 07:04 PM   #6 (permalink)
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Quote:
Originally Posted by 04dmax88 View Post
Disconnected lines around cp3 and filled them with diesel. Reassembled and it fired right up! Mustve had air stuck in there. Btw truck runs way better now with new cp3. Idle is Much more smooth and a considerable amount of power gained back. 300k on old cp3 definitely had taken its toll. I disagree with waiting to replace it until i had issues. Especially due to mileage on truck, hard to believe its unheard of...but what do i know
I have a brand new engine and I have a good prime to the filter, but when I cracked one injection lines all I got was a trickle of fuel out when cranking. It is a run tested engine. This is the problem I'm having. I'm going to try this tonight.
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Old Today, 01:45 PM   #7 (permalink)
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oil flow

Here is an oil flow picture
Attached Files
File Type: docx *Oil flow.docx (68.2 KB, 0 views)
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