Lift pump question - Page 3 - Chevy and GMC Duramax Diesel Forum
11-16 LML Performance Parts Discussion Discussion of Performance Parts For the 2011 to 2016 LML Duramax Trucks No Advertising

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post #21 of 24 (permalink) Old 10-02-2019, 04:40 AM
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Quote:
based on the design of the actual pump itself if it would flow fuel if the motor seized.
ding...ding...ding
I thought that also.

Less likely with a magnetically coupled design.

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post #22 of 24 (permalink) Old 10-02-2019, 05:14 AM
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Quote:
Originally Posted by Hook'em_Horns! View Post
magnetically coupled
Meaning the motor and impeller are coupled via an electro magnet that is powered when the pump is on?

If so, what mechanism would disconnect that bond if the motor stopped and the circuit was still activated? Or is the motor design such that it virtually never seizes?

2008 Silverado 2500HD CCSB LTZ Diesel
FASS 95 Lift Pump (with Baldwin filters), Edge Insight CTS Monitor on a Windshield Mount, Nicktane Fuel Filter Adapter w/ CAT 306-9199 UHE tertiary fuel filter, Bilstein 5100 Stock Height, Bushwacker Bed Rail Caps, AMP Research Bedstep, Fumoto oil drain valve, Dorman PS Oil cooler, Pioneer AVIC 7200NEX GPS/Stereo, Air Lift LoadLifter 5000 Air Bags.
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post #23 of 24 (permalink) Old 10-02-2019, 06:41 AM
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Usual failure is a shaft bearing, which it doesn't have.

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 #24 of 24 (permalink) Old 10-03-2019, 06:42 PM
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I’ve got 40k miles and about 3 years on my Kennedy twins. No issues. According to my Insight they keep pressure between 7 and 8psi just before the stock filter head. Might drop to 6psi at 3k rpm pulling my toy hauler in the mountains. The old fuel cooler bracket in front of the tank on my ‘14 makes a nice spot for mounting the pumps.

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