Lift pump questions: mechanical vs electric - Dodge Cummins Diesel Forum
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View Poll Results: Which fuel setup?
Airdog 2 165 10 47.62%
FASS 150 HD with Drawstraw 5 23.81%
DTT Assassin with GDP Water Separation and Fuel Filter 4 19.05%
GDP Fuel Boss with GDP Water Separation and Fuel Filter 2 9.52%
Voters: 21. You may not vote on this poll

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Old 01-02-2013, 02:41 PM   #1 (permalink)
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Lift pump questions: mechanical vs electric

So I have been comparing the DTT Assassin with GDP Filters against the Airdog 2.
I would like more input on your guys suggestions and experiences.
The Airdog has the water separator and 2 micron fuel filter, but also has the air separation system.
It appears as if the DTT Assassin coupled with GDP water separator and fuel filter does not do air separation, is this correct? How important is this?
Which is your preferred fuel pump/filtration setup?
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Old 01-02-2013, 02:48 PM   #2 (permalink)
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My vote goes for the dtt. The GDP fuel boss requires you to keep the Intank pump which if your going to a mechanical pump it kinda defeats the purpose in my mind. I personally will be going with the dtt pump and fuel filter/water seperator from GDP. you are correct the mechanical pumps aren't a air perperator. With the mechanical pumps there is no way to not get enough psi to the cp3 more rpms more psi to the pump, to a set max psi via gearing
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Old 01-02-2013, 03:56 PM   #3 (permalink)
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More filtration can always be added. I like the fact that the DTT ramps pressure up needed and idles low off the rpm. Seems like a smoother install also. I think I would have went that route if I would have known years ago. I have had no issues with my AD though.
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Old 01-02-2013, 04:14 PM   #4 (permalink)
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Mechanical seems the way to go for sure. All the guys i have come across that run the mitusa mechanical love em
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Old 01-02-2013, 04:25 PM   #5 (permalink)
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Is the air preporator part of the airdog or fass really that important? It seems like that is the whole appeal?
And then if I used a drawstraw, what is the proper way to install it without getting the 1/4 tank issue?
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Old 01-02-2013, 04:30 PM   #6 (permalink)
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Here what they claim it does AirDog® II is designed to operate at flows and pressures beyond the maximum requirements of the engine. It receives fuel under vacuum from the fuel tank containing entrained air/vapor, particulate contaminates and unknown quantities of water.

The fuel passes through the water separator which removes the large particulate contaminates that could damage or jam the gerotor fuel pump. The fuel, with only entrained air/vapor and tiny particulate contaminates remaining, then enters the fuel pump.

The fuel, now under positive pressure flow, enters the fuel filter. As the fuel passes through the filter media and the remaining particulate contaminates are caught and contained, the entrained air/vapor is also separated. Through the positive fuel air separation features of the patented AirDog® II the separated air/vapor is discharged from the filter and back to the fuel tank through the Primary Air/Vapor Discharge Port.

The fuel passing through the filter media is now free of contaminates and power robbing air/vapor. At pressures and flows able to meet the needs of the engine, it exits the fuel filter through two passageways. First, the fuel for the engine, passes into the fuel pickup tube and on to the engine. Then, the excess fuel not needed by the engine recycles internally through the pressure regulator back to the water separator.

As far as 1/4 tank elimination you install the straw so it seats good on the bottom of the module while compressed. Drilling holes in the side of the module and running the return to return right on top of the pick up helps also. I can run mine on E with no issues.
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Old 01-02-2013, 08:40 PM   #7 (permalink)
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Ok so you are putting the drawstraw directly into the fuel module?
Or is this for airdog fuel module upgrade kit?

Does the DTT come with a pressure regulator?
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Old 01-02-2013, 09:09 PM   #8 (permalink)
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Assassin plus filtration and be done with it.
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Old 01-03-2013, 09:48 AM   #9 (permalink)
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I just cant justify the cost of Mechanical pumps, so I vote FASS. You couldn't pay me to risk running another Air Dogg, when mine dies so does my business with them.
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Old 01-03-2013, 10:25 AM   #10 (permalink)
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The problem is All electronic Pumps will fail (Mec pumps slowly die after 1000s of hrs) every Diesel I own with electronic pumps installed have bypass or 2 Pumps,If you go electronic plumb in a bypass, that way way it fails you can start the truck off with either the GP will take it form there,just don't shut the truck off and loose the prime, if you do shut it off by accident just start it right away in most cases it will start right up, or just start it again on either.If you have the factory in tank pump installed the trick will NOT work ,YOU cannot pull fuel through the OEM Pump, its a Tow...UGH.

Here's My scale
1.Mechanical
2. Fuelabs with Bypass
3. Fass With bypass

Air is not a problem in CR. its a long and controversial subject But thats My opinion base on 30 Years of Pump experience.
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Old 01-03-2013, 10:32 AM   #11 (permalink)
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Ill be keeping up with this. Some good info so far.


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Old 01-03-2013, 10:36 AM   #12 (permalink)
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Another side Point, Install down stream adjustable Pressure regulator, electronic pumps should AWAYS run at Max capacity (Don't choke them down on the vacuum side or Pressure side) Fuelabs has a on demand pump that looks promising.

Fuel coolers are another addon-but if you keep 1/2 tank or more aways on DD use you should be good, I aways try to keep My tanks full when 90*+, that return fuel form the CP3 and back leakage form injectors can reach 135* and if you you only have a few gallons in the tank it only going to raise on hot days.
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