Engine/Transmission (1998.5 - 2002) airdog vs. fass...

[THenningsen]

can't decide which one to go with. Seems a lot of folks have gone with the fass here. Besides the price, what are the negatives of the airdog?

 

[DHayden]

My Airdog has been flawless. It's quieter then the FASS (I believe) but I think it just comes down to personal preferance. I wont get any flames going here but you can read many a thread on FASS vs Airdog... Airdog is made by the Father, FASS by the son who set out on his own. The sega starts there...

 

[lcaad1249]

Anothe recent option is Gladier Diesel

 

[DiTrani]

Other than price, I don't think there are any negatives associated with the AirDog compared to the FASS. They are very similar functionally and I believe use the same motor.



Both are kind of pricey for what they are, and even though I don't regret my FASS (flawless over the last 2 years), I'll probably home-brew the next time I have to do something like this.

 

[blacksheepdiesel]

THenningsen,



I have had my AirDog on for 140,000 miles and have had zero issues. I will not say AirDog is perfect, but at the same time I have not personally known of one to fail.



Having installed both FASS & AirDog I can say there is a big difference in how the two units are designed and manufactured. AirDog wins there easily. Also, the AirDog was designed to work with the factory fuel tank suction tube while some FASS units have had issues on this point.



To me the AirDog wins hands down no matter what aspect you consider.



PM me for the name of a dealer. I make zero dollars from any sales.



Godspeed,

Trent

 

[dsherman]

Go with the air dog you will be very happy with it

 

[PRout]

What is the GPH rating of the Airdog?

 

[WTBurke]

Model numbers have changed recently. I have an FP-80 and there was an FP-80HP for highly modified fuel requirements at 500 HP or more.



I thought the originals were rated at 85GPH at working load. However: I've seen sites selling the new model number FP-100 with data spec's at 100 to 110 GPH.



When Larry Crawford was around we could just call and ask but, now that Kenny is the only one left the poor guy is on overload and getting a call into or back from him takes time.



I work in the 'pump' business (industrial liquids) and when a person looks at any pump the spec's may be misleading. Some manufacturers spec 'free-flow' volume and others spec 'working-load' at a given PSI level.



I have free flowed my AirDog into a five gallon bucket and the given volume is extremely healthy and most likely more than we need at many different horse power levels.



William

 

[Cummins724]

You can't go wrong with either pump. They are both great units & very reliable too.

 

[OPoole]

The new FASS pumps are a lot quieter with the new motor plus they have a 4year warranty. They come with all hose and fittings to install a harness and relay. Including factory type suction hook up to the tank a lot nicer then 2 years ago. FASS now has a 3micron filter good idea for 3gens they come in 95gph 150gph and 200gph

 

[PRout]

And this is my point. . I can only suspect the reason the 150Gph Fass unit has had problems pulling fuel through the stock fuel pickup is because it is pulling more fuel than most others.

Is 150gph overkill? Probably. Are 1/2 inch fuel lines overkill? Probably. Is a 1/2 inch fuel pickup from the bottom of the tank overkill? Probably. But of course, none of us engage in overkill when it comes to our cummins diesels. And having no more than 2 psi of fuel variance maximum from no load to 450 HP (or way more in some cases) is probably overkill also.

Until the stock pickup tube has been replaced, the fuel system is still flawed no matter what pump you go with. It is a pos and has probably contributed to the failures of lots of oem pumps.

Added: I ended up using a 1/2" copper pipe soldered to a bulkhead fitting for my new pickup tube. About a month afterwards, Eric at Vulcan Products started selling his 1/2" Draw Straw kit. It looks alot easier to install and a better fix than what I went with, so to be helpful I recommend looking at his kit or anyone elses that is similar.

 

[PRout]

Ok, now you guys got me thinking again. .

I would be curious to know how the OEMs or 70 dollar lift pumps are holding up with the 1/2 inch fuel pickup tube conversions. . I bet a setup like Gary's (using a low pressure pusher pump feeding a standard carter lift pump) with very little input restriction would work out pretty decent, and be easy to r&r if needed.

 

[LowFly]

We don’t get a bunch of calls on the 150 having issue with the stock pick-up. Is the stock pick-up the best to use? No... . but does it work for the most part... . seems to be ok from this end. Reason why FASS/AirDog/Walbro might have issues with the stock pick-up is simple. They are all regulated returned pumps. This means that if the pump moves 85 GPH, It’s moving 85 GPH all the time through the pick-up. The stock pick-up was not designed, per se, for this amt of volume to be circulated through it. Now does that mean it doesn’t work? No. For the most part, works just fine. BUT you run into issues of the fuel constantly being circulated though the pick-up that any debris in the tank will be pull to the screen in the bottom of the module a lot quicker than if the stock pump was being used. This is good and bad in ways…. means that you are scrubbing your fuel many times over before it hits the injection pump or rail pump. Bad is that the module screen in the tank might be more prone to clogging due to debris being collected on the screen. The HPFP’s are internally regulated. SO they only supply fuel on demand. This means that the volume running through the stock pick-up at one time is greatly reduced. I have ran my 150 GPH FASS for almost 3 years without any pick-up issue. The Suction Tube kits we have are good options as well as Eric’s Draw Straws kits for aftermarket means to an end. Any kit that moves fuel via a regulated return is at risk of clogging the stock pick-up. BUT this is not a chronic issue with our pumps (OR any others i would assume) unless a 200 GPH is used. BUT an alternative pick up is provided in these kits. I feel the older the truck, the more of a chance that these issues might pop up.



As for our flow ratings, the 95, 150, and 200 GPH are all rated at free flow. BUT we do rate some of our kits flow rate at pressure. This is any part number with a PSI in it. (EX: FASS 150/90-1008@45PSI. This is 90 GPH at 45 PSI for a 12V Dodge)