Preporator Airdog

[Huff N Puff]

I may be way off but my first thought is you are sucking the fuel out of the OEM bucket very quickly losing pressure than it recovers and your pressure goes back to normal. The OEM bucket has a fine screen and a small plastic valve, the bucket can be sucked dry by an aftermarket pump system such as the Airdog. I believe this is why we have seen some failures.



Anyway just a thought. Curious to hear what you find. I am not familiar with the AD or where the gauge is plumbed so ask around a little more.

You are right tractorface,once you approach 500hp you do need to open up the suction line that supplies the pump, to any pump you use, that can move enough fuel to support that kind of horsepower.

 

[CEkstam]

fuel flow for 500+ hp

The testing that we have done on the higher output 5. 9's point out that the stock suction tube in a stock collection basket is sufficient to supply plenty of fuel. This is for engines with up to about 550hp. The standard AirDog maximum fuel flow is about 115 gph at 0 pressure. It will maintain 10 psi at 92 gph. Our tests confirm that there is no problem producing these flows and pressures while drawing fuel through the stock Dodge pickup tube. Note: 10 psi @ 92GPH will handle a C-16 600hp Cat truck engine!



One thing to consider however, is that the return from the engine drops directly into the collection basket close to the suction tube. This can cause a lot of aeriation of the fuel when the tank is at lower levels.



Just thought you might find this interesting.



Thanks,

Charlie Ekstam

 

[DarrellB]

Anyone using the AirDog with the stock fuel filter? I ask because this is where my fuel pressure gauge fitting mounts and if I take the filter housing off I'm going to have to find and new location for the fitting to run my FP gauge. Anyone have any ideas of where else I can pick up the incoming fuel to run the isolator? I know there is a shrader fitting on the VP but I need an 1/8NPT for my fitting.



DB

 

[rmrc]

Anyone using the AirDog with the stock fuel filter? I ask because this is where my fuel pressure gauge fitting mounts and if I take the filter housing off I'm going to have to find and new location for the fitting to run my FP gauge. Anyone have any ideas of where else I can pick up the incoming fuel to run the isolator? I know there is a shrader fitting on the VP but I need an 1/8NPT for my fitting.



DB

Same question regarding a fuel pressure source for my gauge! Seriously considering the Air Dog!

 

[tractorface]

Tell us about the testing

Perperator Guy



Curious about your testing. Did you use several sample fuel buckets?

How much restriction did you measure in the suction line?

How much restriction is acceptable?



I ask because I have only seen two OEM tank modules and they varied greatly. The one in my truck would barely supply enough fuel for the stock lift pump let alone an aftermarket unit. I did not measure the restriction but watching the pulsing flow made me realize there was a serious problem. It is my contention that the quality of these units is not consistant, creating problems for some and no trouble for others. Granted my testing was not scientific and my results are questionable because of that.



Last comment, I was under the impression that the airdog pumped the same amount of fuel no matter what the truck needs, the difference is the amount of fuel returned to the tank through the air dog return line. Am I way off on this? I don't see how the HP level of the truck matters if this is true.



Not disputing you just want to understand the system

Thanks

 

[jcbrown]

AirDog™ with Stock Fuel Filter...

Anyone using the AirDog with the stock fuel filter?

I retained the stock filter housing when I installed the AirDog™ Fuel Preporator®. You can see my post here.



Ordered an extra quick-release fitting from Fuel Preporator®.



My fuel pressure sending unit is installed on the bottom of the fuel filter housing.



Oo.