Kennedy Diesel lift pump - high volume, low pressure, no silly return line required, low amp draw, easy install, no leaks, no need to filter before pump, etc.

Kennedy Diesel

 

Pick one you like the install of better and go with it.

Both are good pumps and either will work just fine.

100gph is more than enough for stock fuel on the engine side. I run a fast 95 and have a cp3 conversion with sportsman pump and never have any fueling issues even on my big tune.

 

Don't consider myself bias as I have both brands on different trucks but prefer the Air Dog for ease of installation, mounting location and low noise.

 

I second Kennedy. Very low noise easy install. Have the dual pump kit on my 12 for 2 years now. Lost power to pumps once truck can pull fuel the pumps was able to finish hauling hay for 2 days before had time to find loose connection. Used a cheap fuse tap.

 

I was considering buying an airdog from the research I have done.. I went to the Kennedy website and can't even find a picture of the pumps they have.
Are there any pictures and a detailed description of the operation anywhere?
Airdog says it removes the entrained air from the fuel.. Does Kennedy do that?
What would make a Kennedy pump better than the others?

 

The removal of air is 20+ year old marketing hype from the old days of mechanical injection that used low pressure injection pumps and fuel to pop off the injectors.
The Kennedy lift pump is a centrifugal design that is low pressure but high volume. Very low amp draw and nearly silent. No return line required. No leaks and a far longer lifespan. No need to pre-filter before pump and does not produce metal. Free flow design so truck will run with pump off. The deluxe kit comes with everything you need for an easy install. There is plenty of pics and info on Kennedy website that I will link below. Make sure to click on install instructions. When you call/email Kennedy Diesel you get to talk to the man himself and not some nickel/hour employee who does not have a clue what the product is.
http://www.kennedydiesel.com/docs/Duramax lift pump.pdf
Kennedy Diesel

Kennedy Diesel

 

Thanks for the information.. I will look at Kennedy some more. I just want a reliable pump without any problems.
I live in north with temperatures well below 0. Any possibility of - 30 degrees making these pumps fail? This is another concern I have.

 

Thanks for the information.. I will look at Kennedy some more. I just want a reliable pump without any problems.
I live in north with temperatures well below 0. Any possibility of - 30 degrees making these pumps fail? This is another concern I have.

These are the most reliable pumps on the market. I live in Montana and mine have seen -20* temps several times with no issues.

 

And his customer service is great. He will help solve any problems, if you should have any.I had mine shutting down at odd times Kennedy walked me thru trouble shooting, turned out I had a bad fuse tap that would work loose.

 

I appreciate the information. Thank you 😊

 

Not bashing Kennedy pumps but also would point out that the Air dog is also a flow through design as I can attest to that from experience and would say that extra filtration could only be a plus on these trucks especially the older trucks.

 

Extra filtration can easily be added to the Kennedy with a simple/cheap 1-14 filter thread head where you can choose from several common filters of your liking.

 

The OP asked only about Air Dog and FASS so I skipped over this thread yesterday. I assumed he had already narrowed it down. Personally, I have a Kennedy single pump and I think it's great. I also run a big Donaldson auxiliary fuel filter which I think is also important. Ok, the other units have the filters integrated with the pump, so that's nice.

I have no experience with the Air Dog or FASS, but I have read several times where the high volume, high pressure pumps push air into the tank (have I got that right?) so you need to take out the tank and change the sump pickup. With the extra aeration I guess it's a good thing these pumps take out the air (that they caused). The OP asked if there was any reason not to run the bigger pump. Yep, because the smaller pump probably doesn't cause other problems.

 

I will never run a Fass again, Airdog, Kennedy or Fuelab. I have never run the Kennedy, but always hear good things, I have run the other 3, the Fass quit in the middle of Canada and even though it’s supposed to be a pull through design, mine wouldn’t, left me stranded. Then dealing with their customer service because the shop that installed mine didn’t send the card in, even though we had the invoice for the work done only 10 months before, they said no warranty. I put several Airdogs on friend’s trucks, very easy to install because of where they mount, super quiet and flat works. I personally have the Fuelab on my last 2 trucks, 1 replaced the Fass, and then another on my newest truck. I made my own mount to put it where the Airdog mounts, they are also super quiet and I like the design better.

 

I had a Fass on my 15. It did fail on me, but it did not leave me stranded. They did warranty it for me, but because I ran a sump, I couldn’t really not have a lift pump, I bought another one before I sent it in. I shipped it in the original box that it came in to make sure it would not be damaged in shipping. I received it back in a generic box with paper stuffed in it and the fuel pick up straw sticking through the box. I was pissed to say the least. I checked everything out and it was fine, but it was super disappointing that they couldn’t even pack it in a way to make sure that the pump they “warrantied” showed up in the same shape I sent it. I would never buy another Fass product for that reason. I did send in my warranty card when I bought it so I didn’t have an issue with that. It was only about a year old when it failed. Idk anything about Airdog or Kennedy, but I wouldn’t own another Fass.

 

Why do you think you need a lift pump?
Also a larger capacity will cycle more fuel through the lines causing it to heat up over time, not a good idea.

 

So why do you think you need a lift pump? What truck do you have? Must have missed that in you information or post. My 2015 3500 GMC duallly with 90K is rocking and I tow 7000 regularly. We also custom build many trucks and Air Dog is our preferred on a custom build. We actually did the first and maybe only install of a diesel in a 48 F5. Engine is a PPE custom build with trick Alison transmission. Air Dog pump but I still run OEM on my truck..

 

I have been using an Air Dog II 100 for about 2 years with PPEI tune and have been very satisfied on our 2015 3500HD LML. Up to 150 HP and 20MPG. I don't hot rod too much but it runs like a monster for an 8000# truck. I also haul a 4000# truck camper and can hardly tell it's on the truck tow/haul tune (50 HP).

 

After doing research I went with the AirDog on my 2012. A very good friend has the Fass on his 2012. The best reason for my install was my LML has a cp4 and the lift pump takes the pressure off of it so it will last longer. I have 300k on my 2012 and run a tuner and unless you want to go all out and put bigger injectors and turbo for more than 700hp the 100 gal per hour should do fine. my AirDog is quieter than the Fass but neither bother me when I've driver the other. The install took about an hour for the pump on his lift would be longer on the ground. The return line was a breeze, just cut the fuelling hose and less than 5 minutes later it was hooked up. I also kept the stock filter in case I get too much moisture at a fillup, the light on the dash will give an alert. I got bad fuel back in 2005 on my 2003 Duramax and drained the filter 3 times to get back to where I bought the fuel. I now have double backup if it ever happens again.

 

In tank Pumps are the Best electrical pumps, last longer then external electrics , Now that being said , Mechanical pumps will out live any electronic Pump, The GP Gear pump mounted on the back of the CP4 use in 2011-16 D-max creates 25Hg at 500-3000RPMs, and produces up 125GPH OEM, mod the GP and you can double its Volume and increase it Hg to 32.

The OEM GP is more then capable of suppling Combustion and lubricating fuel for the LML and CP4. I have yet to see a Starved CP4, The COV will shutdown combustion fuel circuit thus killing the engine, OEM COVs will always divert fuel to the lubricating circuit 1st. the Lubricating circuit has priority over combustion fuel.

Modding the COV requires someone that's and expert and Knows the work arounds of HPCR Systems, mess with the recipe and BOOM.

 

In tank Pumps are the Best electrical pumps, last longer then external electrics , Now that being said , Mechanical pumps will out live any electronic Pump, The GP Gear pump mounted on the back of the CP4 use in 2011-16 D-max creates 25Hg at 500-3000RPMs, and produces up 125GPH OEM, mod the GP and you can double its Volume and increase it Hg to 32.

Explain how to go below absolute of 29.92.

 

I installed Kennedy twin lift pump on my LBZ 54,000 mile back and have had no problem. It totally solved my limp-mode problem. I recommend

 

I ordered the FASS 100 with the Wehrli Relocation Bracket to allow me to mount it as far away from road debris as possible. Now I just have to find the time to install it.

 

Absolute What?

 

Absolute vacuum can't go any more than that..

 

OK I see what You mean yes My Gauge go's to 30 The needle swings by by the 30 So I just stated what the gauge was adding a few point, You are correct. I never notice until now the needle stops Short of 0. Time for a New gauge. I think using it both Ways PSI/Hg has taken its toll on it after years of use.

You are Correct.

 

My 2 cents as I am also looking into this, Heard the same person designed both Fass & Air Dog. Also if engine is stock go with 100 is fine. If I had the $$$ right now would do the CP3 conversion, but just heard today, that this would require a different engine tuning?

But I'm full of it and don't know didley squat.

 

I believe that there are some vendors with a CP3 conversion that doesn't require tuning.

 

Happy camper here for the past 3 years with AirDog 165