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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 06-01-2016, 02:38 PM   #1 (permalink)
Johnnydingding
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Lift Pump. Need advice on why and which one.

I've owned my truck for about 8 years. It's all stock and has NO tuner.
It's got 212k on the clock and I believe it's got lots of life left in it.

Anyway, I've been experiencing some fuel related issues recently. (I posted a question earlier today about low rail pressure.)
I also had a start, stall and no start last week. Rebuilt the fuel filter head and that seems to have solved that issue.

I need to restore my faith in the durability of my rig and think maybe it's time to invest in a lift pump.
My questions are what are the advantages of having one and which one is best for my truck. I have no plans on performance mods or tuner. I'm happy with it in stock form.

Thanks!

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2003 Silverado 2500HD 4X4, 6.6L Duramax, Allison & NP263XHD
New injectors @ 145,000 (June 2011) and 211,000 (June 2016) * Kennedy Twin Lift Pumps * Nicktane Fuel Filter Conversion * PPE Boost Valve * 2" Ready Lift Leveling Kit * Banks Exhaust * SS Brake Line Kit * Hadley Train Horn
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Old 06-01-2016, 03:02 PM   #2 (permalink)
superpro56
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A lift pump will ease some of the stress on the CP3, as it is in stock form, this part performs double duty: drawing fuel from the tank via vacuum pressure and also highly pressurizing that fuel to be injected into the cylinders. A lift pump is going to provide an ample supply of pressurized fuel to the CP3 basically removing one of the tasks of that part. This is a must do on tuned trucks because as HP increases, so do fuel demands. On a stock truck this is less apparent but there is still some benefit to be had. Most lift pumps these days are sold as a combo including air separation and additional filtration for the fuel. If you are only looking for a pump only, look at the offerings from Kennedy Diesel, they also offer additional filtration as an add on to the pump setups. If you are looking for a self contained unit including filtration and air seperation take a look at the AirDog Units. Typically these units are louder due to the type of motor used than the Kennedy units, although I never had a problem/complaint of noise while the truck was running with my AirDog unit.

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2002 Silverado LS 2500HD CC/SB, EFI Live V2 DSP5 by Duramaxtuner, Big Dipper Trans w/ PI converter, Danville LBZ CP3 w/modded regulator, Banks Techni-cooler, 4" MBRP all stainless exhaust with 6" tip, Kennedy boost controller, Air Dog 150, Kennedy Billet Pickup and custom bulkhead fittings, Intake horn mod, SD manifold, S&B intake, Cognito HD tierods, pump rub fix, Autometer Cobalts on the A-pillar (fuel press, boost and pyro), Recon smoked cab lights and smoked 3rd brake light, Kodiak badging, Cooper Discoverer 265/75/16, ExtangRT Tonno, Tekonsha Prodigy, Husky liner floor mats, Line X OTR, Lund stainless cold front grill cover

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Old 06-01-2016, 03:34 PM   #3 (permalink)
LBZjunkie
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Even stock you will one day experience your dreaded start/stall, no start due to no fuel. Your rubber hoses will deteriorate and eventually suck air, partially collapse, giving you a low fuel rail pressure also. A lift pump won't magically fix all fuel related concerns for ever, but it will be a very good investment. I went with a single Kennedy and added my own filters to it, leaving the OE in place. All that is needed is a little pressure, if I'm not mistaken my single pulling through one filter and pushing through two additional I'm aroun 2-3 psi. IIRC.
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Old 06-01-2016, 04:23 PM   #4 (permalink)
sfcjones
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Kennedy's lift pump will solve any and all future problems with fuel delivery.
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Old 06-01-2016, 04:33 PM   #5 (permalink)
jon5212
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I was going to add, if you are not planning on making big power, a single small pump like A kennedy would suffice, You don't need an Airdog or a Fass.
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Old 06-01-2016, 05:54 PM   #6 (permalink)
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I'm saving up now for a Kennedy single to add to the pre-filter I added a while back. It looks like the wiring harness that Kennedy offers makes the mod super simple.
Jim
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Old 06-01-2016, 06:12 PM   #7 (permalink)
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Quote:
Originally Posted by Johnnydingding View Post
I've owned my truck for about 8 years. It's all stock and has NO tuner.
It's got 212k on the clock and I believe it's got lots of life left in it.

Anyway, I've been experiencing some fuel related issues recently. (I posted a question earlier today about low rail pressure.)
I also had a start, stall and no start last week. Rebuilt the fuel filter head and that seems to have solved that issue.

I need to restore my faith in the durability of my rig and think maybe it's time to invest in a lift pump.
My questions are what are the advantages of having one and which one is best for my truck. I have no plans on performance mods or tuner. I'm happy with it in stock form.

Thanks!


A couple of Tech Tips worth reading:


http://www.kennedydiesel.com/docs/Du...ift%20pump.pdf


http://www.kennedydiesel.com/docs/Du...20Failures.pdf


And some decent background on selection here:


Kennedy Diesel
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Old 06-01-2016, 08:55 PM   #8 (permalink)
SpikeDmax
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Another going with a Kennedy pump soon.
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Toyo MT 285/75/16, Nicktane filter, Neoprene seat covers, Bilsteins 5100, 2nd owner @85k. 200k Nov. 2015. Do all my own work and looking forward to handing my son the keys soon.
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Old 06-02-2016, 09:06 AM   #9 (permalink)
Johnnydingding
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Installation of the Kennedy Single lift pump doesn't require removing the tank...correct?
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2003 Silverado 2500HD 4X4, 6.6L Duramax, Allison & NP263XHD
New injectors @ 145,000 (June 2011) and 211,000 (June 2016) * Kennedy Twin Lift Pumps * Nicktane Fuel Filter Conversion * PPE Boost Valve * 2" Ready Lift Leveling Kit * Banks Exhaust * SS Brake Line Kit * Hadley Train Horn
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Old 06-02-2016, 11:00 AM   #10 (permalink)
Sturgeon-Phish
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I saw some installation steps that did not require dropping the tank and it depends where you connect your pump in the line. I think the Kennedy kit attaches at the top of the tank and in some cases you have enough room to attach the replacement line.But before dropping the tank, it is often easier to disconnect the bed and shift it back enough for access. Since I installed the pre-filter along the frame rail I've already have cut and spliced in the fittings for the filter head and will mount the pump on the existing filter head.


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2003 GMC 3500 crew dually LB7 NF2 Federal. Onyx Black, Dark Tint & De-badged, Transfer Flow 50g aux tank; Pace Edwards power tonneau. Isspro EGT & Boost. PPE Boost Valve. Mich. LTX A/T2 LT215/85R16. CTS Insight with backup camera, Air Box mod, Stock exhaust no muffler, Fumato drain valve. B&W turnover with Companion 5th wheel platform, Line-X. Hi/Low Beam light mod. 80 watt LED backup lights . Kennedy Single Pump & Fuel Pre-filter (Thanks John). Weather Tech mats. MA Pump Upgrade with new T case rear half. LDS injectors (Thanks Brent). High Idle mod (Thanks Eric) Hopkins Easylift. Pulls a '05 Wildcat 31QBH 5th wheel. Member #1078 3500 Dually Club

Last edited by Sturgeon-Phish; 06-02-2016 at 11:02 AM.
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