Kennedy Lift Pump? - Page 2 - Chevy and GMC Duramax Diesel Forum
11-16 LML Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #11 of 39 (permalink) Old 10-21-2019, 08:00 PM
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Right? And he says not to have filters around the pump, but it is ok if you put an extra mega-filter up front under the airbox to catch the coldest of windchill in the winter running down the road. I don't understand that theory at all. I was going to add a BF1212 before it and a Donaldson filter after it. You guys see anything wrong with that? I was just worried about the pump being up so high. Didn't know he was going to crush all my dreams..........
I would keep it simple by going with a 10 micron filter after the pump to stop the big chunks then a quality filter like a Racor in the factory spot.

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post #12 of 39 (permalink) Old 10-21-2019, 08:03 PM
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10 micron FWS before the pump, not after.

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post #13 of 39 (permalink) Old 10-21-2019, 08:06 PM
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10 micron FWS before the pump, not after.
With a Kennedy pump you want to go after as to not starve and burn up a pump. As the filters start to load up the pump can continue to push through the filters you keep you going.
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post #14 of 39 (permalink) Old 10-21-2019, 08:18 PM
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With a Kennedy pump you want to go after as to not starve and burn up a pump. As the filters start to load up the pump can continue to push through the filters you keep you going.
That was my thinking on my install too.....
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post #15 of 39 (permalink) Old 10-21-2019, 08:23 PM
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That was my thinking on my install too.....
Mine has been that way for about 250,000 miles now with zero issues.

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post #16 of 39 (permalink) Old 10-21-2019, 08:25 PM Thread Starter
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I would keep it simple by going with a 10 micron filter after the pump to stop the big chunks then a quality filter like a Racor in the factory spot.
That wouldn't make the water separator very effective at catching water after the pump emulsifies it would it?

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post #17 of 39 (permalink) Old 10-21-2019, 08:29 PM
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That wouldn't make the water separator very effective at catching water after the pump emulsifies it would it?
Like I said in another post I have done it this way for 250,000 miles with zero issues. Just look at all the people that have installed Kennedy pumps and use only the factory fuel filter and they have no issues either.
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post #18 of 39 (permalink) Old 10-21-2019, 09:05 PM
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That wouldn't make the water separator very effective at catching water after the pump emulsifies it would it?
The churning and bypassing and churning and bypassing some more in Fass and A/D set ups is what emulsifies water into the fuel.

The Kennedy takes the fuel from the tank, and gives it a gentle shove towards the CP3 or 4, and thats it.
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post #19 of 39 (permalink) Old 10-21-2019, 09:28 PM Thread Starter
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After rethinking all of this I think I will run the pump down below by itself and the Racor or Baldwin BF46062 in the stock location. This will be easier on the pump and should keep the CP4 and injectors happy going down to 4 micron. This with a good additive for some lubricity and I should be protected from the CP4 bomb. Thanks for the help guys!

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post #20 of 39 (permalink) Old 10-22-2019, 03:52 AM
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Quote:
Originally Posted by ShopSpecialties View Post
With a Kennedy pump you want to go after as to not starve and burn up a pump. As the filters start to load up the pump can continue to push through the filters you keep you going.
While the logic sounds good, it doesn't hold up in real time pressure testing I've done. The filters involved have very little pressure drop. The CP3 can pull thru 3 filters with NO lift pump involved. It's doubtful the little JK pump would be strained, routing it one way or the other.

The pressure drop between a fresh filter and one that's at end of life is only 2"Hg. It will work either way, before or after. But a FWS filter is most efficient when the fuel is pulled thru it, not pushed (per Baldwin). This is how your stock fuel supply is set up.

When you do add a LP, including an aux filter head for a FWS before the pump, maintains that efficiency, and greatly improves the life of the under hood filter, which is now your secondary filter. One from being downstream of a 10m filter. Two, positive pressure thru the stock filter will utilize more of the full media, with no voids left, which you'll find under vacuum use.

Height location isn't much of a concern. Per JK, what kills the pump is trapped air from not priming properly. It leaves tell tale internal wear marks seen when they open it up for warranty. And he states that if they find those wear marks, any warranty is voided.

Summation; there's no wrong way to mount one, just a better way than others.
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