FASS or Air Dog ??

[MarcRoth]

Ok what fuel system supports the best. I know that the FASS system has a bye pass return But how is the Air Dog Compare? In Other words what is the better pump. Thanks Marc

 

[LightmanE300]

In my opinion they are both a total rip off. You should just get a reliable pusher pump with a fuel filter like a Racor or the like. You pay so much more for their so called 'air separation' feature, which in my opinion is marketing. I've never seen any dyno results or testing that proves a FASS type air separating system makes more power than a setup with a pusher pump that makes the same PSI. .

 

[driverno8]

Not sure???? I really don't know. I just bought an AirDog. It's not even here yet. Good point though on not seeing dyno numbers. Didn't even think about that. My bad.

 

[MarcRoth]

I do know that they are pretty heavy on the price, but at 50k for a truck it seems to be cheap insurance to make this pig live. There has to be someone that is running these set up.

 

[RonsRig]

I bit on the FASS. I felt that I needed the extra filtration for some of the unknown fuel sources I might encounter. If you choose the FASS and you have a short bed 4x4, there is a special bracket needed that might not be with the pump you ordered. Check with dieselpp.com and look at the installation instructions. I got an older version of the system that didn't have the parts and I had to order them seperate.

 

[Wiredawg]

FASS is Fine

I have a FASS on my 02 3500 and see 16PSI at idle and drops to 15 full throttle. My truck engine is quieter and because of the high fuel flow is more reponsive. I believe this is bcause it pushes steady fuel to VP 44. I'm not sure you'll see anything on the dyn, but you feel it on the road. I have a 2d one I will be installing on my wife's 03 pretty soon.



I know folks who have put 3 stock liftpumps on their trucks even setting them up as pushers. I've seen folks buying the ones from speed shops too. I lost a VP 44 on my 02 and the lift pump always read 14 PSI idle and about 8 PSI full throttle. I think only seeing a little over one PSI drop at full throttle is a good sign of the effectiveness of the FASS.



For my own part, I have two FASS. What else can I say?



Wiredawg

 

[Briman]

I don't believe that either one is supposed to add horsepower, so don't even include that in your decision process. There are other benefits though. I just bought a 95 GPH FASS because I like the vendor. I'm still planning the install so I can't say much about it.

 

[OT-OF-HERE!!]

FASS,...I've got it and like it.

I've got the FASS and have had it on for about 2 months. The engine is quieter, ... the fuel pressure is steady, no matter how you run it,... . it has fuel warming for winter driving (haven't hooked that up yet, but intend to very shortly with an on/off switch for when it gets warmer next Spring),... . no dyno results to share but I am going to do a baseline run soon before I put a box on and that should tell something relative to all the stock runs that have been made and posted on the 600. It seems most of the stock runs I've seen show the 600 at around 270HP to 280HP. I have upgraded my exhuast and air intake and the both couldn't amount to over 20HP IMHO, so I'd say if she comes in over 290 then it's probably contributed by the FASS. That's a little rough on pure assesment, but should be relative.

 

[MarcRoth]

Fass Air Dog

Thanks for the responces keep them coming. Not looking for any horsepower incresses just the asurance that these pumps wont let you down when you really need it. Tried the holley pumps they fail tried the Aeromotive with the same results. just want to know that these pumps will suport the added power that is incressed by boxes, exhaust system and injectors. Because we know that all of these add power, except of the exhaust. just the sound is what you get Thanks Marc

 

[Foot]

I just installed an AirDog on my 2003 2500 and the truck idles and accelerates smoother with the AirDog. I don't think there is any horse power gain just smoother running, less exhaust drone and the piece of mind that my engine is getting clean fuel. I installed the AirDog for the extra filtering to prevent future injector problems. The AirDog can now be installed at the input to the stock fuel filter (replaces te lift pump) so you get double fuel filtering, fuel heating and WIF indication. Overall th AirDog looks like a good quality product and is easy to install.

 

[Gauthier]

Can the '05 pusher pump be retrofitted to an '04 without major modifications? Does the Airdog require cutting any stock fuel lines?



Has anyone been denied or given grief for warranty service from the installation of an aftermarket filter or filter/pump system?

 

[jmolnar]

Lightman E300, Who In Your Opinion Makes A Reliable Pusher Pump? My Carter Lasted 30k. Have Since Installed Air Dog. Easy Filter Changes, Larger Fuel Lines, Great Pressure And Volume And Easy Install. John.

 

[Gauthier]

Does the AirDog require cutting anu fuel lines? Can the '05 pump be retrofitted to an '04 without changing the tank?

 

[Roger rodbolt]

Gauthier,

The AirDog installs without cutting any fuel lines. Everything needed to install is furnished including 1/2" fuel lines and fittings from the tank to the engine or as an option to the stock fuel filter.



MarcRoth,

I've been resisting a response to the "rip-off" post made by another member. The AirDog is our answer to lesser pumps in the way the Cummins 5. 9 is to the Oldsmobile 5. 7 diesel... ... ... ... . Comparing the Fass and AirDog is involved difficult as they are said to do and be the same thing here on TDR but construction and performance are VERY different. Most folks have not seen the two side by side. The Fass was first in the pickup market and has a longer time, loyal following; I'm not knocking the people who bought them as they spent their money on something much better then a Carter lift pump. The AirDog sales have exceeded expectation and have been selling out production since it was introduced this year. I'll give a few comparisons.



The AirDog has a one piece CNC machined pump body with an internal bypass for safety. The Fass lowers production costs by slicing up the pump body for machining and bolting it together with gaskets. It has no safety bypass. The AirDog electric motor is machine recessed into the pump body for perfect alignment with the pump rotor and seal. This makes for long life, smooth, quiet running and low amperage draw. The Fass is held to a flat pump body with two screws and a gasket sandwiched between. To support the hanging motor weight a (turbo?) band clamp is used with a piece of aluminum angle bolted to the base... ... .....

A twist of a screw is significant and misalignment here is critical to a georotor pump.



The AirDog was designed from the ground up for light trucks. Compact, with proper flows for light & medium diesel engines. It uses value priced Fleetguard Stratopore fuel filters that do not protrude below the frame and certainly can't be seen below the cab or bed or the truck. The Fass was copied from our prototype of a Class 8 truck Fuel Preporator unit and uses large hydraulic filters instead of fuel filters. We've sold a number of units to replace the Fass that have had their filters broken off, either off road or by hitting debris on the highway that catch the low hanging Fass. The AirDog bracket is solid and supports both ends, the Fass center mount only and needs reinforcement.



Both units have prewired wiring harnesses. The AirDog harness is Bosch relay controlled so there is no amp load on the ECM, no voltage drop to the motor. The Fass doesn't use a relay. Both units return excess fuel and separated air back to the tank. You can leave the engine idling while fueling with the AirDog but not the Fass. Both units provide new fuel lines from the tank to the engine. The Fass uses 3/8" line, the AirDog 1/2" line for max flow. I could go on... , the AirDog sells for a fraction more the Fass but costs a bundle more to produce. The AirDog is CARB approved and manufactured to ISO 9001 standards.



There are good pusher pumps out there. I just purchased a well used Weldon 2005A, 60gph pump for a non diesel project. It uses the same ball bearing motor we do, same industrial brushes for long life. I paid ~ $300 for it,used on eBay, retail is $899. 00. The Weldon is a quality, vane pump, but has no regulator and no filter, no return, no wiring harness, no mount, no fittings, etc. Even though it’s rated only 60gph it will out flow and outlast a trio of Carters and Holleys hooked in parallel. If the AirDog is a rip-off what would the Weldon be at say... $1500 with installation kit and no air separation?

__________________

 

[MichaelWright]

I've got the AirDog. Pressures are nice and steady at 15psi at wot. Cruising at 70 they are at around 17. I've got the high horse power model, 450+. It does the job real well. My reasons for purchasing besides my modifcations, which I felt would benefit from it, were the fuel filtering. Lots of bad fuel out there, I would have bought it anyway, mods or no mods. CTD's aint cheap, neither are injectors.



Just my . 02



Mike

 

[Jerry1]

I ordered an Air Dog a week or so ago. Spoke with them the other day and it may ship today ( I hope ). Had to take my truck back to Dodge yesterday for injector knock problem. This will be the third injector replaced! My hope is the Air Dog 3 micron filter will solve this problem. I also have had a noise since day one when going 80+ on the interstate that sounds like a pump cavating or turning on and off. I'm hoping by elimating the factory lift pump this problem will be solved also. Waiting... ... ... ... ... .

 

[Gauthier]

What is finest micron filters available for the Air Dog?

 

[Jerry1]

They come with a 6 micron filter but they have and i'm not sure it's either a 2 or 3 micron. All there filters are made by Fleetguard also.

 

[Roger rodbolt]

Jerry1,

Your AirDog was shipped on Tuesday , and you are correct the standard filter has been a 6 micron and is now marked by Fleetguard as a 5 micron. Unless the customer requests otherwise all the common rail AirDog gets the 2 or 3 micron Stratopore. We also have 10 micron Fleetguard Stratopore's for the 12 valve trucks or anyone that wants OEM filtration.

Larry

 

[rbattelle]

It's really a toss-up

I've read a lot from both camps on the AirDog vs. FASS system. In my *opinion* both are of excellent quality. However, I don't really think either one is very well thought out (again, my opinion). What are you getting for the price? You're getting an aluminum block machined to accept a couple spin-on filters with a lift pump attached to it. What you don't get is:



-An option for a 12v heater

-Any kind of adjustable pressure regulator



What's the flow rate vs. pressure for the pump? Can these systems be submerged in water (if you mount it beneath the frame and try to ford water, will you be in major trouble?). Why do both these systems bypass the stock filter canister, when that canister comes with a nice 300W heater and a 10-micron filter? In my *opinion* it would be more appropriate to retain the stock filter canister (you did pay for it, after all) and add the improved filtration from these units.



Nevertheless, for those who want a simple, complete, bolt-on installation to replace the stock lift pump you really can't beat either FASS or AirDog. I'm not sure who's been running either one for a long time, so longevity is not immediately apparent, but it seems they'll probably last longer than the stock LP.



In my *opinion* you can do better (better is very subjective, I know) than FASS or AirDog by designing and building your own system. But then, that's true with almost everything you can buy: either pay someone to build it for you and be happy with what you get or build your own and get something that exactly fits your needs. Same reason so many people build their own computers.



If I were *forced* to buy either an AirDog or a FASS, I'd probably buy the AirDog. Probably. That's just my *opinion*. Best of luck with whatever you choose!



-Ryan