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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 03-03-2015, 10:18 AM   #51 (permalink)
TandC
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I am Todd Form T&C Diesel, I've seen the CP3.4 last form 15K to 380K miles, The CP3.4 is just not the robust design of CP3s (over 30 different configuration's) The CP4 is used on many vehicles Ford, GM , Ram 3.0 and others.

Water is the big killer of all HPCR pumps, contaminates are 2nd, and Poor volume would be 3rd. Filter labels are so mis-leading I would get banned if I posted the truth on the procedures used to rate Filters ( Most re-badged filters are rock catchers only)
The CP4 has 3 main bushings Cam ,Tail and Front, the tail bushing takes a beating and eventually the trim will get out of spec and self destruct the pump.

You can add to the life of this pump (CP4) by keeping your fuel tank full in summer heat, the fuel cools this unit.

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Old 03-03-2015, 11:36 AM   #52 (permalink)
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Quote:
Originally Posted by TandC View Post
I am Todd Form T&C Diesel, I've seen the CP3.4 last form 15K to 380K miles, The CP3.4 is just not the robust design of CP3s (over 30 different configuration's) The CP4 is used on many vehicles Ford, GM , Ram 3.0 and others.

Water is the big killer of all HPCR pumps, contaminates are 2nd, and Poor volume would be 3rd. Filter labels are so mis-leading I would get banned if I posted the truth on the procedures used to rate Filters ( Most re-badged filters are rock catchers only)
The CP4 has 3 main bushings Cam ,Tail and Front, the tail bushing takes a beating and eventually the trim will get out of spec and self destruct the pump.

You can add to the life of this pump (CP4) by keeping your fuel tank full in summer heat, the fuel cools this unit.
Now there is some good information!

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Old 03-03-2015, 11:58 AM   #53 (permalink)
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I forgot to add, depending on use ,Re-bushing the pump will extend its life, I know its a hassle to remove. If this pump is freshen up at 200K-250K it will last, The front seals leak at about this range also, The Ford version has more problems BC it does not have a GP (Gear pump) mounted on the rear, its internal lubrication is dependent on the external lift. The pump itself will meter more combustion fuel incorrectly (Ford) if the lift system is restricted or restrictive.

Last edited by TandC; 03-03-2015 at 11:58 AM.
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Old 03-03-2015, 03:40 PM   #54 (permalink)
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Finally, someone with a reason why the Ford seems to have more problems.

Thanks.
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Old 03-15-2015, 08:06 PM   #55 (permalink)
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So I installed my air dog ii 2 weeks ago. Since installing it, the last 3 fill ups have been over 20mpg. Does this seem odd to anyone? Before I was 16-17.5 and my driving nor commute has changed.
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Old 03-15-2015, 09:14 PM   #56 (permalink)
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Warmer weather?
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Old 03-15-2015, 09:48 PM   #57 (permalink)
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I would think that, but I've never gotten that good of mileage before. Also, warm is a relative term Haha... It's been 45-50! Much better than the 0-20 from 2 weeks ago
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Old 01-01-2016, 04:02 PM   #58 (permalink)
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Quote:
Originally Posted by marcalle View Post
So I installed my air dog ii 2 weeks ago. Since installing it, the last 3 fill ups have been over 20mpg. Does this seem odd to anyone? Before I was 16-17.5 and my driving nor commute has changed.
Was it a fluke? are you still getting that kind of mileage? Maybe because no air is getting to the INJ pump, that is helping mileage. That is a big jump though.

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Old 01-02-2016, 01:18 PM   #59 (permalink)
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Just got my 11 back from cp4 failure. Dealer had it for 7 days. They had to take the cab off the truck to get to it, so I'm guessing you dont wanna do this in your garage. Cost was close to $10K to replace the whole fuel system due to metal from the pump going through the system. Not a fun fix. Thank GOD it was under warranty.
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Old 01-02-2016, 02:01 PM   #60 (permalink)
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Scribed...

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