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Discussion Starter #1 (Edited)
I hope this is in the right forum; those of you that have an Air Dog II do you have it running from the tank then the Air Dog II then the OEM fuel pump or have you eliminated the OEM fuel pump and just running the Air Dog II?

I am just wondering if my setup is wrong or if it is right?

I eliminated the OEM pump from the loop and I am hoping this is right. I recently installed 6.4 Banjo Bolts and a updated Fuel Filter Regulated Valve Kit for peace of mind.

If you have eliminated the OEM like the manual states have you adjusted the Air Dog II's fuel psi adjustment?

I just do not want to run into any more problems regarding the fuel system.
 

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Discussion Starter #2
I may have just found my answer, the Air Dog II replaces the OEM while the original Air Dog works in conjuction with the OEM pump.

If I am wrong please offer some advice.
 

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What exactly is the fuel sump and how does it help?
 

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Instead of using the fuel pick up tube to draw fuel, you install the sump to have a constant supply of fuel.

The factory pick up tube might be drawing fuel toward the front of the tank, so if you were down to a 1/4 tank and punch it the fuel heads to the back of the tank and can cause the pick up tube to suck air into the fuel pump.

The sump gets installed in the bottom of the fuel tank with a fuel supply line connected to it on the outside of the tank, this way you will alway have fuel being supplied to the fuel pump.
http://www.hellmannperformance.com/
 

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I am in need of a pump of some sort. I just installed a fuel pressure gauge and at idle it stays at 62psi but at wot it can drop to around 40psi for a split second. I already have the upgraded blue spring and 6.4 bolts. What pump do I need? If I went with the original AirDog plumbed into stock pump would I still need a sump? Could I get away with just a regulated return? I am looking for the cheapest easiest way to do this. I use my truck for towing but leave in Xtreme Street tune in it otherwise. At the most I would ever do is some tow injectors.
 

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Instead of using the fuel pick up tube to draw fuel, you install the sump to have a constant supply of fuel.

The factory pick up tube might be drawing fuel toward the front of the tank, so if you were down to a 1/4 tank and punch it the fuel heads to the back of the tank and can cause the pick up tube to suck air into the fuel pump.

The sump gets installed in the bottom of the fuel tank with a fuel supply line connected to it on the outside of the tank, this way you will alway have fuel being supplied to the fuel pump.
Hellmann Performance Intercoolers, custom fabrication richmond texas, hellmann performance richmond texas, custom fabrication, diesel truck, welding, diesel performance parts, texas, powerstroke
You need to drop the tank to put a sump in, correct?
Is there any way it can be done with the tank in. :dunno:
I have a cab & chassis and would have to remove my hitch to be able to drop the tank. :(
 

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You need to drop the tank to put a sump in, correct?
Is there any way it can be done with the tank in. :dunno:
I have a cab & chassis and would have to remove my hitch to be able to drop the tank. :(
Tank needs to be dropped in order to put the flange in.
 

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I do not have a sump installed and my pump will run my tank dry. If you have a sump and something tears the fuel line you will loose all of the fuel in the tank. With the draw from the top of the tank the fuel line is better protected and if it were ripped out the fuel would stay in the tank.

Just something to consider.
 

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I do not have a sump installed and my pump will run my tank dry. If you have a sump and something tears the fuel line you will loose all of the fuel in the tank. With the draw from the top of the tank the fuel line is better protected and if it were ripped out the fuel would stay in the tank.

Just something to consider.
How is yours installed that you are able to run your tank dry? I would rather not use a sump if I didn't have to.
 

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my AD2 will suck the tank dry using the stock pickup. My other truck with a Fass on it would suck air at 1/4 tank but it has a 3/8 pick up tube on it.
 

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I am glad to hear this about not needing a sump. What size is the stock pickup?
Stock pickup is 3/8". I debated a long time about getting a sump but decided there is no reward for it. My fuel pressure stays constant so its not starving for fuel. IMO sumps are pointless in a stock tank, if your building a 1000+ HP sure buy a fuel cell that has a sump built in, but I see no need for the common truck.
 

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Question what do you do if you can't find an air leak? My pump will loose 10-20 psi with innovative tuning xstreet and stock sticks. And does anybody know how many turns out the regulator is set at? I want to check that just incase it's my gauge that has gone bad. Thank you in advance
 

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Instead of using the fuel pick up tube to draw fuel, you install the sump to have a constant supply of fuel.

The factory pick up tube might be drawing fuel toward the front of the tank, so if you were down to a 1/4 tank and punch it the fuel heads to the back of the tank and can cause the pick up tube to suck air into the fuel pump.

The sump gets installed in the bottom of the fuel tank with a fuel supply line connected to it on the outside of the tank, this way you will alway have fuel being supplied to the fuel pump.
http://www.hellmannperformance.com/
Yah I have seen this on the web, I am just not sure about it being good for my Excursion since it has a plastic tank. Or at least that's what I was told it had and with the skid plate all around it I can't tell.
 

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That's a nice looking piece and the split flange would let ALL the fuel run into the sump.
 

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ok i am gonna get the air dog 2 system when i get back home. i am curious to know what my fuel pressure is now and what it will be after the airdog system..... the tunes i am running are not at there full potential because of my fuel pressure. after the install how much more strain would i be putting on my engine and turbo by running high pressures....... its only got 112000 on it and i want it to last me a while but i do drive it hard......

so my question is what are the fuel pressures before and after the install and how bad will it effect my truck in the long run????
 
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