lift pump sticky? - Chevy and GMC Duramax Diesel Forum
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post #1 of 4 (permalink) Old 07-31-2019, 04:53 PM Thread Starter
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lift pump sticky?

Seems like everyone has a lift pump so now my LBZ wants one too. Since this is so popular I would think that there would be a sticky somewhere all about it but so far I haven't found it. Can someone point me to a good link?

My cursory googling I discovered some differences.

a the high end ones may have higher pressure settings

b. high end ones may have more than 1 filter? Maybe 1 for water 1 for filtering.

c high end ones have a separate recirc fuel line that goes back to the tank. I assume the cheap ones just use the same route that is used in stock ie, go thru the oem filter, thru cp3/4, bypass to tank when high pressure is not needed.

Some seem to have more complete kits or mount more easily?

One question I have, I would think you'd want to have minimal fuel in the tank when installing since a line has to be cut and fuel is gonna start draining fast. You better be ready to catch it and attach or plug it off.

Lots to learn.

besides just being cool with a lift pump I'm adding one to help (I hope) with a fuel starvation problem (I think) under heavy towing load. I'm guessing that the real problem is that the source fuel lines are collasping due to partial vaccuum.

Don - WA5NGP

06 LBZ white, X Cab, Long Bed, 2WD, raised driver seat, Work Truck nuthin fancy
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post #2 of 4 (permalink) Old 07-31-2019, 06:00 PM
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Make sure to fix the existing issue first before putting a pump on. The more expensive ones are adjustable so that fuel can be increased when one modifies for higher fuel demands with bigger injectors and cp3/4.2. You only need about a middle of the road setup if your just looking for the extra filtration and to help the fuel system. Lots seem to like the kennedy systems with the stock trucks. And modified trucks seem to lean more to FASS and Airdog.

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post #3 of 4 (permalink) Old 07-31-2019, 06:41 PM Thread Starter
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I think I found the definitive thread that answers most questions.
https://www.duramaxforum.com/forum/0...ft-pump-6.html

Sounds like for the simple not hot rod implementation Kennedy is the way to go. I need to read a bit more I don't understand the wording about TWIN pump configuration. There's actually 2 pumps?

Don - WA5NGP

06 LBZ white, X Cab, Long Bed, 2WD, raised driver seat, Work Truck nuthin fancy

Last edited by wa5ngp; 07-31-2019 at 06:47 PM.
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post #4 of 4 (permalink) Old 07-31-2019, 07:03 PM
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If you've got some basic plumbing skills, you can assemble your own lift pump kit.
https://www.duramaxforum.com/forum/d...-pump-kit.html

Twins....as in two singles hooked in series.
You don't need twins, a single JK pump is fine.

Plus, a single deluxe kit comes with the same mounting plate to add another pump for twins.
That open spot is the perfect place to add an aux FWS filter pre-pump, making your underhood filter the new secondary filter.

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