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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 02-27-2015, 09:40 AM  
Hal Hughes
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I have a few questions about adding the Kennedy lift pump. I called a couple of diesel shops in my area and asked if they installed a lift pump on my truck, would that help the CP4 to last. Both shops said no. I do have a Nicktane adaptor and use the Donaldson fuel filter plus the Nicktane auxiliary fuel/water filter. Do you guys think the Kennedy lift pump will help the CP4 to last longer? If so, how does it help? Other than the filters, my truck is stock.

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Old 02-27-2015, 03:54 PM  
turbovanman
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I'd call Kennedy and ask him, he's a straight shooter.

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1984 G20 Diesel Get a Way Van, 6.2L turbo. Rebuilt 1989 700R4, 3.08 gears. Fluidamper, modified hummer headers, 2.5" mandrel Y-pipe to 3 inch single system, Hooker Max Flo muffler, 3 inch F350 mandrel bent tailpipe-passenger side exit, 6.5L turbo lower intake, 6.5 military IP-5149, Turbonator open faced injectors set to 2500 psi, HX35W with a 60x86mm cast wheel at 15psi, ARP studs, .010" head gaskets, bypass oil system, Dmax van fuel pump/filter combo, Aeromotive fuel pump. REMOTE MOUNT TURBO INSTALLED!!!! Burning hydraulic fluid, jet fuel, WMO.
2003 VW Wagon 2.0L TDI auto, silver, heavily modified-Wife's.
2004 VW Wagon TDI 5 speed-blue-also modified-Mine!

1989 Dodge Caravan ex daily driver, 2.5L TIII DOHC Turbo, GT35R, [email protected] mph.

2002 Gold Dmax 4 door, 2500HD 4x4-new camper/trailer hauler-minor mods and a small tow tune!
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Old 02-27-2015, 04:31 PM  
AXE
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Kennedy has made the statement more than once that all Duramxes should have a lift pump. If you research some of his comments, he elaborates on his reasoning.

Whether or not it will save a CP4 may be debateable. Most of the issues with the CP4 were due to the ceramic piston failing and the coating not being able to withstand the higher wear induced by ULSD here in the states. You may benefit more from running a good additive or running a biodiesel.

However, a lift pump is certainly going to help with additional filtering and water separation, which is good. It will certainly keep positive pressure in system and cause the CP4 to work easier, and it will keep air out of the system which can also cause issues with injectors.................all good!

I am not brand partial, but I did just buy the new Air Dog II 4G cause they were on sale. This corrects some of the past reliability issues that some had and adds some new features. Lot's of fuel filter options. By the way, contrary to what people say, I am sure this unit will pass fuel if the pump were to fail.

AirDogĀ® II-4G - Advancing AirDogĀ® Technology by Removing Entrained Air/Vapor from Diesel Engine Fuel

Kennedy's system is well regarded and is the most economical, perhaps a little harder to install without the quick connects.
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Old 03-01-2015, 09:38 PM  
marcalle
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I ordered up the air dog ii 165 and installed it this weekend. Fairly simple, took only 3 hours to get it the way I liked it. I trimmed all the hoses except the supply to the motor. I'm debating on not using the stock steel line and running it right up to the motor.... Any thoughts on that?

Otherwise, I lightly coiled it up and used the steel line for now. Super quiet once the truck is running, not even heard. Quiet right before it starts too. You can hear it, but barely. I also have a stock filter delete kit to install next weekend.
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Old 03-02-2015, 12:50 PM  
AXE
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Quote:
Originally Posted by marcalle View Post
I ordered up the air dog ii 165 and installed it this weekend. Fairly simple, took only 3 hours to get it the way I liked it. I trimmed all the hoses except the supply to the motor. I'm debating on not using the stock steel line and running it right up to the motor.... Any thoughts on that?

Otherwise, I lightly coiled it up and used the steel line for now. Super quiet once the truck is running, not even heard. Quiet right before it starts too. You can hear it, but barely. I also have a stock filter delete kit to install next weekend.
Did you install the new 4G model? Did you drop the tank? I am going to do mine this week when my tank empties. I was looking at it this weekend and with my lift, I can get to the tank pretty easily. It looks relatively easy to drop, except for the filler tube connection. I am going to try it without the tank drop first.
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SOLD 2005 Chevrolet 2500 HD Duramax, CCSB, 4x4

2017 Can Am Maverick Maxx, 2009 Tahoe 215Xi Deckboat, 2007 Weekend Warrior FSC2800 Toyhauler, 2008 Ducati Hypermotard
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Old 03-02-2015, 01:38 PM  
turbovanman
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Quote:
Originally Posted by AXE View Post
Did you install the new 4G model? Did you drop the tank? I am going to do mine this week when my tank empties. I was looking at it this weekend and with my lift, I can get to the tank pretty easily. It looks relatively easy to drop, except for the filler tube connection. I am going to try it without the tank drop first.
Hint for you guys, leave the filler neck hooked up. Remove the fuel cap and put a rag or paper towel in the hole, unbolt it from the plastic-3 7mm screws and undo the ground, 10mm bolt and just manouveur it all out.
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1984 G20 Diesel Get a Way Van, 6.2L turbo. Rebuilt 1989 700R4, 3.08 gears. Fluidamper, modified hummer headers, 2.5" mandrel Y-pipe to 3 inch single system, Hooker Max Flo muffler, 3 inch F350 mandrel bent tailpipe-passenger side exit, 6.5L turbo lower intake, 6.5 military IP-5149, Turbonator open faced injectors set to 2500 psi, HX35W with a 60x86mm cast wheel at 15psi, ARP studs, .010" head gaskets, bypass oil system, Dmax van fuel pump/filter combo, Aeromotive fuel pump. REMOTE MOUNT TURBO INSTALLED!!!! Burning hydraulic fluid, jet fuel, WMO.
2003 VW Wagon 2.0L TDI auto, silver, heavily modified-Wife's.
2004 VW Wagon TDI 5 speed-blue-also modified-Mine!

1989 Dodge Caravan ex daily driver, 2.5L TIII DOHC Turbo, GT35R, [email protected] mph.

2002 Gold Dmax 4 door, 2500HD 4x4-new camper/trailer hauler-minor mods and a small tow tune!
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Old 03-02-2015, 03:37 PM  
AXE
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Good info!
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2015 Chevrolet 2500 HD LTZ Duramax, CCSB, 4x4 - Cognito Stage II 6" lift, RBP Fury wheels and 295/65/20 Toyo MTs, DuramaxTuner SPADE, Air Dog II 4G lift pump, Firestone Air Bags/Air Lift Air Compressor, GM Assist Steps, MBRP exhaust tip, Passport 9500iX Radar Detector


SOLD 2005 Chevrolet 2500 HD Duramax, CCSB, 4x4

2017 Can Am Maverick Maxx, 2009 Tahoe 215Xi Deckboat, 2007 Weekend Warrior FSC2800 Toyhauler, 2008 Ducati Hypermotard
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Old 03-02-2015, 04:14 PM  
turbovanman
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Oops, sorry, this was for earlier GM models, not sure about the 2015 but its easy to see if that apply's.
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1984 G20 Diesel Get a Way Van, 6.2L turbo. Rebuilt 1989 700R4, 3.08 gears. Fluidamper, modified hummer headers, 2.5" mandrel Y-pipe to 3 inch single system, Hooker Max Flo muffler, 3 inch F350 mandrel bent tailpipe-passenger side exit, 6.5L turbo lower intake, 6.5 military IP-5149, Turbonator open faced injectors set to 2500 psi, HX35W with a 60x86mm cast wheel at 15psi, ARP studs, .010" head gaskets, bypass oil system, Dmax van fuel pump/filter combo, Aeromotive fuel pump. REMOTE MOUNT TURBO INSTALLED!!!! Burning hydraulic fluid, jet fuel, WMO.
2003 VW Wagon 2.0L TDI auto, silver, heavily modified-Wife's.
2004 VW Wagon TDI 5 speed-blue-also modified-Mine!

1989 Dodge Caravan ex daily driver, 2.5L TIII DOHC Turbo, GT35R, [email protected] mph.

2002 Gold Dmax 4 door, 2500HD 4x4-new camper/trailer hauler-minor mods and a small tow tune!
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Old 03-02-2015, 06:18 PM  
AXE
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I was looking at the filler hose today and it is the same connection as previous models. That being said, there is plenty of clearance above the tank to make the connections without dropping the tank.

The directions are a little dated and only include pictures of the 2009 truck. Thoroughbred Diesel has a video that is a great supplement.

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2015 Chevrolet 2500 HD LTZ Duramax, CCSB, 4x4 - Cognito Stage II 6" lift, RBP Fury wheels and 295/65/20 Toyo MTs, DuramaxTuner SPADE, Air Dog II 4G lift pump, Firestone Air Bags/Air Lift Air Compressor, GM Assist Steps, MBRP exhaust tip, Passport 9500iX Radar Detector


SOLD 2005 Chevrolet 2500 HD Duramax, CCSB, 4x4

2017 Can Am Maverick Maxx, 2009 Tahoe 215Xi Deckboat, 2007 Weekend Warrior FSC2800 Toyhauler, 2008 Ducati Hypermotard
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Old 03-02-2015, 06:22 PM  
AXE
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I think I am going to add a 8.5" wide x 10" tall sheet metal piece between the pump bracket and truck mount to act as protection for the filters. With my lift, I think the filters are going to be pretty well exposed behind the front tires. doesn't look like debris is hitting the tank guard now, but one piece of debris and your day is ruined.

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2015 Chevrolet 2500 HD LTZ Duramax, CCSB, 4x4 - Cognito Stage II 6" lift, RBP Fury wheels and 295/65/20 Toyo MTs, DuramaxTuner SPADE, Air Dog II 4G lift pump, Firestone Air Bags/Air Lift Air Compressor, GM Assist Steps, MBRP exhaust tip, Passport 9500iX Radar Detector


SOLD 2005 Chevrolet 2500 HD Duramax, CCSB, 4x4

2017 Can Am Maverick Maxx, 2009 Tahoe 215Xi Deckboat, 2007 Weekend Warrior FSC2800 Toyhauler, 2008 Ducati Hypermotard

Last edited by AXE; 03-02-2015 at 06:39 PM.
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