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post #1 of 10 (permalink) Old 04-16-2019, 09:53 AM Thread Starter
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CP3 Connection Question

My 2004.5 still has the OEM Lift pump on the fuel canister. I want to add better fuel filtration and a water separator, but it isn't advisable to mount said filters before the OEM lift pump. So I am considering either a Fass or Airdog pump with the dual filter setup. But there is a problem -- I pull fuel pressure from the CP3 through a pressure switch to my Edge Insight CTS.

How can I connect Fass or Airdog to my CP3 along with my Edge Insight Fuel Pressure Tap? Below are two pics, the first is of my CP3. You can see the tap that goes to my pressure switch. The second pic is from install instructions for Fass/Airdog, how the fuel supply line is supposed to connect to the CP3. How can I connect a Fass or Airdog system and still pull fuel pressure as I am now? Is there a fitting or fittings that would do the job?






04.5 QCSB 4x4, 156K, 2nd Owner, Pacbrake, Airbags with onboard compressor, CTS Insight gauge w/Backup Camera, Smarty Jr tuner
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post #2 of 10 (permalink) Old 04-16-2019, 09:07 PM
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Plumb the FASS\AD thru the OE filter housing. Get the 3um filter that goes between the factory canister and the CP-3 with the big line kit for better flow or run it withe the AD filters that are better than the factory one. Either way you get the better filtration and WS. Unless you are looking to make some big power it will flow more than enough fuel, do a better job filtering, and retain the factory fuel heater.

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post #3 of 10 (permalink) Old 04-16-2019, 09:53 PM Thread Starter
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Originally Posted by cerberusiam View Post
Plumb the FASS\AD thru the OE filter housing. Get the 3um filter that goes between the factory canister and the CP-3 with the big line kit for better flow or run it withe the AD filters that are better than the factory one. Either way you get the better filtration and WS. Unless you are looking to make some big power it will flow more than enough fuel, do a better job filtering, and retain the factory fuel heater.
Thanks, cerb. Not sure, but I'm thinking that you are probably referring to a kit such as GDP's filter kit for under the hood. But unfortunately, it's already pretty busy under my truck hood. I see no room between the OEM fuel canister and the CP3 for a fuel filter, due to the fact that I have a PacBrake. When I bought this truck (2nd owner), I lucked out as first owner had installed the PacBrake. I tow a travel trailer, up and back from the mountains, a 6000'+ elevation difference, and having towed now with an exhaust brake, I wouldn't care to tow any serious weight without one, so the PacBrake isn't going anywhere.

No, definitely not looking to make big power. One day I might put a mild towing tune on it, and if my injectors ever need replacing, might go with BBI 0.5's, but I wouldn't do any more power mods beyond those two potential future mods.


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post #4 of 10 (permalink) Old 04-16-2019, 10:03 PM
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I have the fitting u need. Cant remember where its from. It just screws into the cp3 and has a 1/8 npt outlet, with a 10an male nipple

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post #5 of 10 (permalink) Old 04-16-2019, 10:50 PM Thread Starter
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I have the fitting u need. Cant remember where its from. It just screws into the cp3 and has a 1/8 npt outlet, with a 10an male nipple
Thanks. I'm pretty sure that with a little due diligence, I can figure out what fitting(s) would be needed for this.

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post #6 of 10 (permalink) Old 04-17-2019, 08:09 AM
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Don't need another fitting, just plumb the FASS\AD to the inlet of the factory fuel filter housing and you are done. With that in the way then just use the best filters possible on the FASS\AD and get a new tank canister with a 1/2 lines form GDP. If you live or travel in any cold weather get the LP with a fuel heater option and install it.

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post #7 of 10 (permalink) Old 04-17-2019, 11:08 PM Thread Starter
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Originally Posted by cerberusiam View Post
Don't need another fitting, just plumb the FASS\AD to the inlet of the factory fuel filter housing and you are done. With that in the way then just use the best filters possible on the FASS\AD and get a new tank canister with a 1/2 lines form GDP. If you live or travel in any cold weather get the LP with a fuel heater option and install it.
Thanks, cerb. So you mean plumb into the supply line from the fuel tank, right before the OEM filter canister mounted lift pump and let the AirDog push the fuel through? And then can you use the OEM lift pump as a back up to the AirDog?

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post #8 of 10 (permalink) Old 04-17-2019, 11:15 PM
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You need a fitting or adapter to replace the LP on the back of the filter housing with a barb or AN fitting. Plumb the external LP output to that new fitting and you don't have to change anything past it. You will want to get a new tank canister and I would get one with the 1/2 lines so the external LP doesn't have so hard a time priming. Makes them quieter and las tlonger.

Or you could go with the new in-tank performance pump and have about the same cost into it. No data on how long this HP in-tank will last but considering the issues with the crop of electric external LP's it is worth a look.

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post #9 of 10 (permalink) Old 04-18-2019, 12:38 PM
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As Cerb mentioned run the fuel line from your new fass to the OEM fuel filter canister. I removed the lift pump off the back of the filter housing and purchased an adapter and fitting from Fass that bolted on the housing where the lp was removed. Works great.

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post #10 of 10 (permalink) Old 04-18-2019, 04:00 PM Thread Starter
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As Cerb mentioned run the fuel line from your new fass to the OEM fuel filter canister. I removed the lift pump off the back of the filter housing and purchased an adapter and fitting from Fass that bolted on the housing where the lp was removed. Works great.
Thanks for that information!

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