When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Got this back from rebuild last year and during the reinstall I want to run the air return to the tank fill neck.
here’s the air separator
here’s the air return that goes in the neck of the tank fill tube
I have to cut about 3” off the fill neck
This is where it install
and the air/water seperator
used about 17 ft of 300 psi tubing and some an 8 fittings
lay out is
hs lower fuel filter system
run the line out from the plate to the line in of the air/water seperator, run the line out on the air/water seperator to the line in On the hs filter head, run the line out on the hs filter head to the line I. On the hs filter plate. Run air seperator line to tank neck tee fitting .
put the water seperator element on the air/water seperator.
put the 3 micron particle seperator on the hs filter head.
set the motor on the air / water seperator to run above 5 psi
bellow 5 psi the system runs in pass thru mode.
the air/water
Last edited by speakerfritz; Jun 11, 2026 at 10:18 PM.
I see that it can run parallel with the factory tank pump.
From the link:
I would have to study the new Alumina Duty factory fuel systems since I do not own one but I get what you did there... to use the system that will separate air out of fuel, and send it back to the fuel tank.
It says the pump puts out 8 to 10 PSI. I did not see in the installation manual any instructions or directions which indicated the pump pressure could be adjusted.
Unless you rigged one of the boost activated pumps. But I'm thinking not... there's a pressure switch that has to be installed in the intake manifold. Plus the boost activated pump installs differently than the full time pump.
How did you adjust the pump pressure?
AND
Is that Cat water separator the same thread size as the AFE or did you need an adapter?
Last edited by Overkill2; Jun 12, 2026 at 03:47 PM.
Reason: Add to post
The filters are 1-14 same as cat, Baldwin, donaldson
i think the “parallel” comment is a typo. 10 psi lift pump in parallel with 70 psi in tank pump would not make any sense.
so the setup I rigged up takes the line that normally goes to the hs filter head and instead sends that line to the afe pump. From the afe pump out the line takes it back to the hs filter head. Swapped filters putting particle filter as the stage 2 filter in the hs position and put the water seperator filter gs provides in the afe position. The cat water seperator filter is on the afe suction side. The cat particle filter is on the afe pressure side.
the line that goes into the hs plate feeds the intank lift pump. The intank lift pump is pass thru and the intake lift pump has a shut off at X psi. So basically the afe pump would not need a psi driven pressure switch.. but not impossible to put one in.
for the -full time operation feature there is a adjustable sensor in one of the npt ports on the pusher intake. It’s set to 5 but I don’t think I’ll be using it.
the boost driven switch is useful if you are going from the intank pump to the afe…starting at 5 psi prevents afe pump seal blow out.
but, since I am before the intank pump and only driving the intank pump with 10 psi from the afe it should be fine.
another safety net is the dart time looking thing on the 17 thru 19’s ….this is basically a one way psi relief valve….when suction from intank pump is greater than the afe feed…the dart looking thing seals. When afe psi is greater than the in tank pump suction…the dart tip will left excess pressure relief from the dart tip area.
one plus about the hs conversion is you pick up about a quart of volume for water collection in the area the square white filter used to be.
this whole thing is driven by my zero confidence in the ford lower filter system. It was letting water and particles thru which were caught by my then in between filter.
if I had a redo on all this I would go with air dog 10 psi. Now that I know how to make my own AN sized screw on lines I can customize the install.
air dog at the time said they don’t have a product for 17 thru 19’s and afe claimed they were a dropping for 16 thru 19’s but the afe dripping solution on 17 thru 19’s has some problems.
The filters are 1-14 same as cat, Baldwin, donaldson
i think the “parallel” comment is a typo. 10 psi lift pump in parallel with 70 psi in tank pump would not make any sense.
so the setup I rigged up takes the line that normally goes to the hs filter head and instead sends that line to the afe pump. From the afe pump out the line takes it back to the hs filter head. Swapped filters putting particle filter as the stage 2 filter in the hs position and put the water seperator filter gs provides in the afe position. The cat water seperator filter is on the afe suction side. The cat particle filter is on the afe pressure side.
the line that goes into the hs plate feeds the intank lift pump. The intank lift pump is pass thru and the intake lift pump has a shut off at X psi. So basically the afe pump would not need a psi driven pressure switch.. but not impossible to put one in.
for the -full time operation feature there is a adjustable sensor in one of the npt ports on the pusher intake. It’s set to 5 but I don’t think I’ll be using it.
the boost driven switch is useful if you are going from the intank pump to the afe…starting at 5 psi prevents afe pump seal blow out.
but, since I am before the intank pump and only driving the intank pump with 10 psi from the afe it should be fine.
another safety net is the dart time looking thing on the 17 thru 19’s ….this is basically a one way psi relief valve….when suction from intank pump is greater than the afe feed…the dart looking thing seals. When afe psi is greater than the in tank pump suction…the dart tip will left excess pressure relief from the dart tip area.
one plus about the hs conversion is you pick up about a quart of volume for water collection in the area the square white filter used to be.
this whole thing is driven by my zero confidence in the ford lower filter system. It was letting water and particles thru which were caught by my then in between filter.
if I had a redo on all this I would go with air dog 10 psi. Now that I know how to make my own AN sized screw on lines I can customize the install.
air dog at the time said they don’t have a product for 17 thru 19’s and afe claimed they were a dropping for 16 thru 19’s but the afe dripping solution on 17 thru 19’s has some problems.
Still having a tough time wrapping my head around the AFE being used with the factory fuel pump, in the sending unit, but that's alright... maybe one day I will have to study and learn the new Alumina Duty fuel system set up because I am thinking we will have one in the family one day -- for my older son.
Anyways, Air Dog has a pump designed for the 17 to 22s. But it requires modification of the factory fuel sending unit to remove the factory intank pump. Then the Air Dog becomes the solo fuel pump... which is different from my truck, which AD originally sold the systems feeding the factory DFCM with 10 PSI. That's what I am hoping to achieve on my truck (have the proper spring to achieve 10 PSI for that and will have a fuel pressure gauge inline with the DFCM feed hose from the AD), with a Titan 50 gal tank, but I want to buy the S&B "venturi" fuel sending unit which prevents the known 1/4 tank issues. But that's for a new thread of mine in the future...
Correct me if I am wrong, you are using your AFE as a fuel water separator set up with low PSI? I have to assume the factory fuel pressure on the Alumina Dutys are at least 65 PSI, like mine is... but my iDash reads the factory fuel pressure sensor higher at 80ish to 90 PSI.
Correct me if I am wrong, you are using your AFE as a fuel water separator set up with low PSI? I have to assume the factory fuel pressure on the Alumina Dutys are at least 65 PSI, like mine is... but my iDash reads the factory fuel pressure sensor higher at 80ish to 90 PSI.
exactly the problem for 17 and later…the pump driven after market water/air separator's want folks to either modify the in tank sump or use a drain plate on the tank.
thats because water separator's only work on the suction side .
no problem on an 11 thru 16 since you can put an air dog in between the tank and conditioning modual easy.
for 17 and later you have to intercept the line from the side mount filter which goes to the in tank pump and thee is no room to play that game .
the hs plate lets you access the from and thee to lines very easy. This lets you put the water and air separator on the suction side where it belongs.
there are no draw backs to having a lift pump send 10 psi to the intank pump.
exactly the problem for 17 and later…the pump driven after market water/air separator's want folks to either modify the in tank sump or use a drain plate on the tank.
thats because water separator's only work on the suction side .
no problem on an 11 thru 16 since you can put an air dog in between the tank and conditioning modual easy.
for 17 and later you have to intercept the line from the side mount filter which goes to the in tank pump and thee is no room to play that game .
the hs plate lets you access the from and thee to lines very easy. This lets you put the water and air separator on the suction side where it belongs.
there are no draw backs to having a lift pump send 10 psi to the intank pump.
Gotcha... the HSM aftermarket kit let's you grab the line from the tank, or suction as you say, and put the AFE there... then you are essentially "feeding" the in tank factory pump like I would in my truck by feeding the DFCM with an Air Dog... if I am thinking correctly.
Gotcha... the HSM aftermarket kit let's you grab the line from the tank, or suction as you say, and put the AFE there... then you are essentially "feeding" the in tank factory pump like I would in my truck by feeding the DFCM with an Air Dog... if I am thinking correctly.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
