Airdog 2 Fixed!! - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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post #1 of 14 Old 10-22-2012, 07:17 PM Thread Starter
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Airdog 2 Fixed!!

Yes I know everyone is probably thinking, "Geez, ANOTHER AD2 thread!?" But I feel like this info might help someone with an Airdog down the road. I have been fighting this battle with my AD2 for weeks now with my fuel pressure dropping under WOT. Mine is still under warranty so first step was to call Pureflow and see what they recommended. Much to my surprise, I was on the phone with them for all of 5 mins and they was shipping me a new "updated" motor. I got the new motor installed and my fuel pressure was WORSE than with my old motor! I turned the regulator wide open and could only get 32psi out of it So I ran 10 gauge wire from the battery thru a relay and to the pump and grounded the pump directly to the frame and instantly when I started the truck my pressure was 54psi. However, once I test drove the truck, when I stabbed the throttle my pressure would drop into the low 30's. I called Pureflow back and they argued with me that installing a bigger wire to the pump would have no effect on it (even after I told him that I had ALREADY done it and its proven!). So with no more help from them, I took my pump off and took it apart and I found an O-ring that was broke in half on the end of the plunger Luckily I have access to thousands of O-rings and I replaced it and put everything back together. With my regulator set screw only half way in now my pressure is 61psi!! Also the pump is ALOT quieter than before. I have drove the truck around and the only way I can get it to fluctuate at all is if I'm going 55mph or so and I suddenly stab it to the floor and then it only drops about 3-4psi and goes right back up Sorry for such a long post, just wanted to share my experiences and hope it helps someone else out.


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post #2 of 14 Old 10-22-2012, 07:24 PM
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What O-ring material did you use? Viton?

SCT, no studs...yet, Dual OEM intake air filter housings, Banks intercooler & intake elbow, Banks exhaust system, Windrunner ported intake manifold, Bullet Proof Diesel remote oil cooler & thermostat, AirDog2 (plus a couple spares), Power steering filter (Amsoil dual-bypass), MagTec deep ATF pan, Electric oil pre-lub pump, Dakota Digital gauges.
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post #3 of 14 Old 10-22-2012, 07:28 PM Thread Starter
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I will have to check when I get back to work tomorrow.


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post #4 of 14 Old 10-22-2012, 08:12 PM
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What color was it? Viton is usually brown and neoprene is black.

SCT, no studs...yet, Dual OEM intake air filter housings, Banks intercooler & intake elbow, Banks exhaust system, Windrunner ported intake manifold, Bullet Proof Diesel remote oil cooler & thermostat, AirDog2 (plus a couple spares), Power steering filter (Amsoil dual-bypass), MagTec deep ATF pan, Electric oil pre-lub pump, Dakota Digital gauges.
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post #5 of 14 Old 10-22-2012, 08:28 PM Thread Starter
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It was black


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05 F250 FX4 Lariat, SCT Livewire, 155cc injectors, Gryphon FICM tuner, ARP studs, MTW Stage 2 Turbo, Riff Raff boots, Warren Built trans, PMF traction bars ,4 inch straight pipe, Sinister EGR delete, S&B CAI, N-fab bars, level kit, 5% limo tint, 35 Toyos and 20s, Recon smoked everything, Harley headlights, 5k HID's, Camlocker toolbox, lots more
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post #6 of 14 Old 10-22-2012, 09:03 PM
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All our Viton at work is brown to tan in color and we us it 9 times out of ten compared to neoprene. Not saying neoprene is the wrong thing to use but Viton is more robust.

SCT, no studs...yet, Dual OEM intake air filter housings, Banks intercooler & intake elbow, Banks exhaust system, Windrunner ported intake manifold, Bullet Proof Diesel remote oil cooler & thermostat, AirDog2 (plus a couple spares), Power steering filter (Amsoil dual-bypass), MagTec deep ATF pan, Electric oil pre-lub pump, Dakota Digital gauges.
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post #7 of 14 Old 10-23-2012, 07:25 AM Thread Starter
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Thanks for the advice man. I might try to find one made out of Viton and swap it out. Or I'll probably be lazy and just run the one in there till it acts up again (if it ever does). Lol


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post #8 of 14 Old 02-16-2013, 05:18 PM
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When you added the new wire, what type of relay did you use? Like how exactly did you do it? I get mid 30's at wot. I have the AD 2 and a driven diesel regulated return and I have the airdog cranked down as far as possible and I'm getting 65 psi at idle but I feel that the airdog shouldn't have to be all the way down... I have replaced the o ring on the regulator plunger before and I think it's time again. I also believe it keeps wearing out because it is cranked down so far. So maybe better power would allow me to take the nut out a little. Also the AD is loud as hell but I can't find where it's sucking air.... If it even is

'06 F250 CCSB Fx4 Lariat. Ford factory gaskets, ARP headstuds, Ford updated oil cooler, updated standpipes and dummy plugs, STC fitting, Sinister EGR delete, Industrial Injection 175cc Injectors, FASS, Driven Diesel Regulated Return, Custom Tunes from Eric at IDP, Isspro EV2 Gauges (boost, egt, fuel pressure, trans temp), High idle mod. Amsoil 15W40

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post #9 of 14 Old 02-16-2013, 05:24 PM Thread Starter
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I actually used a 30amp relay that is designed for Hella off road lights. I ran 10ga from the battery to relay and then from the opposite prong on the relay all the way to the pump. And then I used the wire from the original Airdog harness that tells the motor to start when you turn the key on, to power the relay up. This setup has worked great but I am still not confident in the longevity of the Airdog motors.


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05 F250 FX4 Lariat, SCT Livewire, 155cc injectors, Gryphon FICM tuner, ARP studs, MTW Stage 2 Turbo, Riff Raff boots, Warren Built trans, PMF traction bars ,4 inch straight pipe, Sinister EGR delete, S&B CAI, N-fab bars, level kit, 5% limo tint, 35 Toyos and 20s, Recon smoked everything, Harley headlights, 5k HID's, Camlocker toolbox, lots more
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post #10 of 14 Old 02-16-2013, 06:08 PM
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That sounds good ill give it a try when I get some time. Do you get 1/4 tank issues? Sometimes when I go around a corner my fuel pressure will drop to 0 for a second then back up. I don't let it get there, not trying to hurt injectors but it will if my needle touches 1/4. It's like instant fuel pressure problems.

'06 F250 CCSB Fx4 Lariat. Ford factory gaskets, ARP headstuds, Ford updated oil cooler, updated standpipes and dummy plugs, STC fitting, Sinister EGR delete, Industrial Injection 175cc Injectors, FASS, Driven Diesel Regulated Return, Custom Tunes from Eric at IDP, Isspro EV2 Gauges (boost, egt, fuel pressure, trans temp), High idle mod. Amsoil 15W40
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