Duramax Diesels Forum Truck of the Week
  #1  
Old 11-27-2017, 11:24 AM
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Default Lift Pump

Hey all. Did a search, but didn't come up with a straight answer, not that I have a question... I just ordered a Air Dog 100gpf lift pump for my '03 LB7. I'll be doing the installation myself. I was just looking for any pointers on the install...and perhaps priming. It seems pretty straight forward from the videos I've watched, just want to cover all my bases before I tear into it.

Thanks in advance!

JC62
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  #2  
Old 11-27-2017, 12:00 PM
aashton1206 aashton1206 is offline
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Drive till you have less than a quarter and drop the tank. And get the metal fuel line disconnect tools before hand that have a really deep shoulder. Makes it much easier.


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Old 11-27-2017, 02:11 PM
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Thanks! What about the draw straw. Something to put it? I see many guys don't even install it.
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Old 11-27-2017, 02:56 PM
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With the 100GPH pump, I wouldn't use a straw. I have the 165 and pull through the factory pickup, and I have no problems at 660+ WHP.
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Old 11-27-2017, 04:19 PM
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I would run the feed line from the air dog all the way to the engine bypassing the factory metal line under the truck. The quick connect will plug right in on top of the driver valve cover. I didn't run mine that way at first. But did later. Mine didn't come with the straw.

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  #6  
Old 11-27-2017, 05:49 PM
aashton1206 aashton1206 is offline
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Been on stock draw at 600hp for 2 years


2004 Silverado Cali lb7, Airdog ll 165, fresh sticks at 325k, Rick Fletes Dsp 5 on v2, 33x12.5 nitto at on 20 inch American Racing 20x10 wheels, Stage 5 Built Transmission by Mike Cole with triple disc billet low stall converter, 4 inch Injen cold air intake, Profab Intake Horn, Batmo Wheel, PPE Race Valve, Full EGR Removed w/ fed belt, 3.5 inch MBRP Downpipe, Full five inch MBRP Exhaust axle dump, lbz cp3 pump, Dual Platinum AGM Duralast, High Output Alternator, Cognito Pittman and idler w/ support kit, Cognito Upper Contol arms, Drilled and Slotted Rotors on all four Corners, FED Y Bridge, Shantz Custom Fab Traction Bars.
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  #7  
Old 11-27-2017, 07:18 PM
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Is a lift pump less noisy sucking through a bigger draw straw or sump rather than the factory pickup?
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Old 11-27-2017, 07:21 PM
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Moved into the Lift Pump section.
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Old 11-27-2017, 09:09 PM
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I recommend addressing the factory pick up no matter what HP you're making. The LLY I did was a 3/8 opening and my LMM was close to 5/16. My truck was holding rail but after running a 5/8 line it pulled so much harder on the big end. Driving around there was a noticeable difference in throttle response.
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Old 11-27-2017, 10:20 PM
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Quote:
Originally Posted by gmduramax View Post
I recommend addressing the factory pick up no matter what HP you're making. The LLY I did was a 3/8 opening and my LMM was close to 5/16. My truck was holding rail but after running a 5/8 line it pulled so much harder on the big end. Driving around there was a noticeable difference in throttle response.
Do you recommend sump or bigger draw straw? I ask because I just bought a used fass 150 from a member of this forum and it came with an un used bigger draw straw kit should I use it or buy a beans sump? My buddy has the same pump on an lml, he initially had it drawing from the factory pickup and it was loud, he has since put a sump on and you can hardly hear it now. I’m willing to spend the money for a sump if it’s quieter than the big straw.
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Old 11-27-2017, 10:55 PM
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Quote:
Originally Posted by Summit_Rider View Post
Do you recommend sump or bigger draw straw? I ask because I just bought a used fass 150 from a member of this forum and it came with an un used bigger draw straw kit should I use it or buy a beans sump? My buddy has the same pump on an lml, he initially had it drawing from the factory pickup and it was loud, he has since put a sump on and you can hardly hear it now. Iím willing to spend the money for a sump if itís quieter than the big straw.
I've never ran a sump. I've done bigger straw and I've modified the factory pickup
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Old 11-28-2017, 03:04 AM
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I'd recommend a sump, personally. The big reason being is sucking though the factory straw increases the load on the pump (Gmduramax isn't lying, the factory pickup is pathetic) and even with a larger straw, you're still asking the pump to work against gravity.

I run a fuelab 40402 with a sump, which is 160gph @ 15PSI. A slight hum and zero vibrations when the engine is off and you don't hear a thing with it running.

Prior, I had a holley hp-150 and it was horrible for noise and vibrations, that was however going through the factory draw. At idle you could feel and hear that one (both were/are mounted solidly to the frame). That said, the holley was a gearator design and brushed and those are inherently louder.
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  #13  
Old 11-28-2017, 10:51 AM
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What is the cause of the 1/4 tank issues some Dmax owners deal with? Is it the original straw?
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Old 11-28-2017, 10:53 AM
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You suck the factory cup dry. Fuel can't get in fast enough.
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  #15  
Old 11-29-2017, 07:45 AM
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I received the lift pump yesterday evening. You guys were right, the 100gph doesn't come with a straw. Would adding a sump be a good idea?
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