AD2 Lift pump - Ford Powerstroke Diesel Forum
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Old 06-02-2013, 09:33 AM
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AD2 Lift pump

Sorry to start another AD2 thread... So I just had my first AD2 failure on thursday of the week before last. The "new" pump motor is here and I was wondering somthing. I read almost all of the AD2 threads and know this can be done. I want to use the AD2 to feed my factory pump. I havnet seen any pictures or read how this was done for the people that have done it. It seems like it should be easy. With the AD2 pulling fuel from the tank, then hooking the pressure side of the AD up to the factory feed side of the factory pump. My question is with the return. Can you just use the y-pipe that comes with the AD2 and baypass the return on the factory pump? If that is possible what happens if the AD fails and the factory pump has to do all the work. I kept my factory pump and had to put it in last week to be able to drive the truck, and I dont want to have to have it flatbeded again. By the way the first time mine has ever seen a hook and it wasnt a 6.0 failure. Thanks pure flow. Any help or pics would be great. I plan on doing this this week so I will update and take pics as I go. Hopefully this will work. I dont want a issue again. Sorry if this was redundant thread and if so mods feel free to delete.
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Old 06-02-2013, 04:58 PM
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The AD2 is a POS Pureflow simple as that. That said yes you can configure the AD2 as a lift pump as I have done on my truck. I am feeding a Fuelab high pressure pump but to feed your oem pump all you need to do is run the AD2 feed OUT to the oem IN. Connect the return from the oem pump to the engine side of the AD2 return U pipe. Then drop the fuel pressure on the AD2 to about 12-15psi. I highly recommend you sump your tank to feed the AD2. Good luck bud.
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Old 06-02-2013, 05:34 PM
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Man...It is good to see you typing responses again. How are you feeling? Thanks for the reply by the way I am going to do the hook up tomorow and see how it goes. Hope you get better soon.
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Old 06-02-2013, 08:52 PM
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You really should incorporate the return side of the factory pump.
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Old 06-02-2013, 09:01 PM
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Quote:
Originally Posted by onebadcoastie View Post
You really should incorporate the return side of the factory pump.
Could you elaborate a little. I thought the return line on the hcfm was a straight through pipe that connects the return of the engine to the tank.

Sent from AutoGuide.com App
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Old 06-02-2013, 09:15 PM
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Inside the HFCM is a DTRM (diesel thermo recirculation valve). Basically what happens is fuel is returned from the secondary filter/regulator back to the HFCM. If the fuel being drawn from the tank is cool, then the return fuel is recirculated back through the HFCM to helps heat the cool fuel from the tank. If the fuel from the tank is warm, the return fuel bypasses the HFCM and goes straight back to the tank. The DTRM starts to recirculate fuel back through the HFCM at 80*F and is full open at 50*F.

That's why you want to incorporate it. It serves a particular function and in order to function properly, it needs to be utilized and it's not hard to do.
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Old 06-02-2013, 09:32 PM
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Good info Shack, learn something new every day.

On a side note I have been thinking of throwing a 6.4 pump in place of the HFCM to feed the fuelab just to make sure it doesn't fail. Where did you get your 6.4 pump from?
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Old 06-02-2013, 09:50 PM
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That's why my plans look like this, utilizing the returns on both pumps:

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Old 06-02-2013, 09:51 PM
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Snafu, I got my 6.4 from one of the members on here who had a used one laying around he didn't need. The p/n is: 8C3Z-9G282-A. Tousley has them brand new for $300 but you can find them on ebay for far cheaper. I just happened to find one laying around the guy didn't need.

Last edited by onebadcoastie; 06-02-2013 at 09:59 PM.
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Old 06-02-2013, 10:00 PM
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I THINK the feulab will be ok with a sump and 10an comming from it but a fuel heater would be a good idea up here.
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