Pretty much says it all, is the airdog worth it as far as mileage, power and injector longevity?

LL

 

Not sure what you will see on your PSD but my wife has one on her 5.9 Dodge and it cleared up some rough running issues.

 

i think it was a wast of money. to much $ for the gain. i just cant see it making that much power.

 

bump.

Seems like an airdog system would take care of any pre pump mods + seperate water, but how often do you have to change filters?

 

There is no power, fuel economy OR longevity advantage with the air dog or any other fuel system 'mod'. Stock is good - except for the in-tank mods and a pre-filter you can get to. The factory fuel filter configuration does an excellent job of removing any air that could get in the fuel.

 

I don't have an Air Dog, I have something better.
If there is no air in the fuel in the first place, you don't have to try and remove it.
I've relocated my fuel pump to the end of the fuel pickup.

 

Dan, are you running a water separator on the pressure side of the pump? That concern is the biggest reason I'm looking at an Airtex pump after my water separator and prefilter.

 

No aftermarket water separater. Just the factory fuel filter housing which is a water separater itself.

 

Dan, what kind of pump is that, Mercedes?

 

It's a Bosch 69430 fuel pump with the check valve at the outlet side removed.

 

Does that pump have a screen or some kind of filter in case of crud in your tank? Is that the only pump for fuel or is it combined with the stocker?

 

The screen for the pump is the old Ford fuel pickup foot attached to the fuel pump inlet.
Rather a course screen, but it stops anything bigger than the pump can chew up and send along to get caught in the fuel filter.
Been running this setup trouble free for about three years now.

 

This is the gallery that I made when I did the job.
Pictures always do a better job than a long explanation.
1999 Ford F550+ 4x4 - Fuel Pump In the Tank

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I installed the air dog and really like it. Diesel fuel contains entrained air, it is introduced as you drive, as you fill your tank, the ford fuel system has a number of areas that introduce air while the truck is running such as the fuel line connections pre-factory fuel pump, they are good at not leaking fuel under pressure but not good at not leaking air into the system under vacuum. The fuel pick up in the tank introduces air as well. The air dog removes this air. After installing I noticed immediately how much quieter the engine ran as well as smoother running on the road. As for mileage increase, if I keep my foot out of it I gained @ 1 mpg. To me it is a worth while mod.

Dan

 

I will concede there may be air introduced from sloshing fuel and maybe from the QD fittings on suction-side of pump - but the factory filter is very effective at removing it. The fuel flows in the bottom of the filter housing and MOST of that fuel is discharged out the top of the housing via the FPR/return. The fuel that is being consumed by the engine must pass thru (2) layers of the factory filter and DOWN thru the filter media to exit the bottom of the housing on the opposite side of the inlet. These redundant measures designed specifically to remove air work very well. Even if some air gets past all of this - we probably have the most tolerant injection system anywhere for entrained air.

Dan, I am confident you noticed a quieter engine after Air Dog had been in there awhile. This is an indication you had some air trapped in the end of the fuel rails. I think this happens all the time because people don't know to cycle the key a few times after changing filter or draining the bowl. I bet 50% or more of the PSD owners I've met have NEVER done this - the truck always starts right up, so they didn't even know it was bad practice!!

The only way to increase MPG's in these trucks is to 'keep your foot out of it'.