fuel pump? - Chevy and GMC Duramax Diesel Forum
11-16 LML Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 141 (permalink) Old 06-24-2019, 11:29 AM Thread Starter
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fuel pump?

Truck just died at the lights. Had to tow it to garage, Waiting to hear from them. It made a couple skips just before dying. 93K miles 2011 GMC Duramax. It sounds like no fuel? Ive been watching youtube videos and fuel pump replacement seems like a nightmare. Replace injectors, rails, drain fuel tank along with pump. Is this right. 2011 would be LML right? with CP5 fuel pump? If this is the case what would a job like this cost? Is there any chance it could be something else that just causes the diesel to quit?
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post #2 of 141 (permalink) Old 06-24-2019, 11:43 AM
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LML, yes. CP4 not 5.
Dealer prices after a CP4 grenades and fills the fuel system with metal...I've seen reports of $10-$12k.

But it's becoming so common, that now a 'kit' of all the parts needed, is offered for a significant reduced price.

Many times, you'll 1st see a 'change fuel filter' warning (as it fills with metal shavings and clogs up)
Any codes thrown?
Engine light?

'11s had TCM failure issues for a sudden no-run.
Need to see what codes are thrown though.

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post #3 of 141 (permalink) Old 06-24-2019, 11:48 AM Thread Starter
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No lights, nothing just quit
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post #4 of 141 (permalink) Old 06-24-2019, 02:47 PM Thread Starter
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Im getting that sick feeling
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post #5 of 141 (permalink) Old 06-24-2019, 02:48 PM Thread Starter
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Tcm?
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post #6 of 141 (permalink) Old 06-24-2019, 03:15 PM
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Trans Control Module....changed with the 1st year of the LML ('11), it was flaky and would crash with no notice.

Maybe your filter head developed a leak, sucking air and a loss of fuel. What was the fuel tank level at?

2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air

Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
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post #7 of 141 (permalink) Old 06-24-2019, 04:14 PM Thread Starter
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OK, I had my filter head lose its prime over the winter so I changed it and seemed to solve that problem. It seemed like same issue today when it died so I'm thinking fuel problem? Will the TCM cause it to quit like that? It has at least 1/2 tank. I just did full brake job yesterday.

Last edited by scrappie; 06-24-2019 at 05:23 PM.
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post #8 of 141 (permalink) Old 06-24-2019, 05:36 PM
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Check the primer button for firmness, to see if it's leaking.

Quote:
It made a couple skips just before dying.
Usually the TCM failure has lots of messages and shifting, loss of comm codes, engine skips, etc.

2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air

Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
I Live my life in such a way that when my feet hit the floor in the morning...Satan shudders & says "Oh shit, he's awake!"
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post #9 of 141 (permalink) Old 06-24-2019, 06:21 PM Thread Starter
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I tried pumping up the primer and it was soft so I pumped it until it was firm ran back around and tried to start, still nothing. Tried priming again and it was soft so I pumped it till it firmed up and tried again, still nothing.
Before it died I felt a couple skips as I pulled up to light then it just quit. Before that it was running good. I didn't get any messages prior. Im really bummed about the CP4 pump issues. This is the first brand new vehicle I ever bought thinking it was good for around 300K. I feel even if it isn't the pump I need to get rid of it before it ends up a real problem....which it already is, I just can't trust the truck it seems.
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post #10 of 141 (permalink) Old 06-24-2019, 06:31 PM
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There is the option to convert it back to the reliable CP3 pump, if that's what it turns out to be.
And there's the Exergy System saver if sticking with the CP4...has a smaller mesh screen to catch the debris when/if it fails....doesn't stop it from failing, just tries to control the damage elsewhere.

Need to find out what codes are stored.

2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air

Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
I Live my life in such a way that when my feet hit the floor in the morning...Satan shudders & says "Oh shit, he's awake!"
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