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Anyone know what the difference is between the FD-4625-AA filter kit and the FD-4641? Getting ready to make my first fuel filter change and am confused as hell.
There is a thread on this, just in the last couple of days.
Far as anyone can tell, filters are the same, the 4625AA kit comes with a plastic clip that isn't needed on later trucks.
My owner's manual for my 2022 lists the 4625AA as the current kit.
Hello, I’m new to this forum, wanted to share…I’ve recently learned (today) that FD 4625 filter does physically differ from the FD 4641. On FD 4641 (oem part for 2022), the “outlet” port is apparently slightly larger diameter than the “outlet” port on FD 4625. Barely noticeable in general appearance. I discovered this when replacing the oem (4641) filter with the newer filter provided (Motocraft, FoMoCo part FD 4525).
Once connected, the outlet port of FD 4525 readily leaked during priming (yes, proper attachment/seal during install), this occurred several times/attempts. Also interesting, the 2 other ports on FD 4625 may possibly be a hair larger in diameter, as all 3 fittings seems a bit loose after attachment. However, only the “outlet” (center) port was noted to leak (strongly).
Intermediate remedy was to re-install oem (4641) filter. This was completed without difficulty, complication, or any evidence of fuel leak.
I plan to follow up with the vendor, as I’ve also noted when the original order for filter was placed, the part number requested was FD 4641 (kit), after looking more closely I did in fact receive FD 4625 (also a kit). The parts received (both filters) are extremely close in physical appearance and fit. The tank based filter (included with FD 4625) was exact to oem and replaced without any problem.
Another finding pertaining to the FD 4641 (kit) is that the engine bay fuel filter, per original (correct) order reflects the following identification (LC34-9150-AA, as viewed in the original order pictures)- this identification matches oem engine bay filter (LC34-9150-AA). I’ve included a picture of the oem engine bay filter ID below. The engine bay filter, which leaked and was included in FD 4625 (kit) does not have the same identification as oem part noted above.
Further internet search provided the following details:
“The Motorcraft FD 4641 Fuel Filter / Water Separator Kit is a genuine OEM replacement filter for your 2022 - 2023 6.7L F-Series Ford”.
FD 4625 kit includes fuel line reinforcement collar, this is not applicable to 2022 (and newer) vehicle.
I realize this is a lengthy read, only wanted to share detailed response/direct experience to the following inquiry- “Anyone know what the difference is between the FD-4625-AA filter kit and the FD-4641? Getting ready to make my first fuel filter change and am confused as hell”.
Hope you find this experience and details within to be helpful. In short, if you have 2022 (or newer), FD4641 is believed to be most accurate.
My first question is, where did you order the filters from? There are a lot of fakes out there, and it’s things like this that make them fakes. I make sure to only order mine from reputable sources, which means no Amazon or eBay.
My 22 started with the 4625’s, which eventually went to the 4641’s and I have had no issues, including the leaking you describe. Also, for what it’s worth, now they are going to the 4647’s…
Yes, did purchase from reputable (Ford) dealership. Interesting and curious about the available inventory (at time of order) as now to now the part number does indeed show “discontinued” for 2022 F250, online Ford OEM parts.
You are also correct about change to FD 4647, although this is difficult to search within the online parts database.
Link below provides pointers to aid identifying “Fake” from OEM.
The FD4647 is an updated design, has quite a bit larger reinforcement ribbing up top of the engine mounted filter to counteract any cracking.
yes…I think that is the one with the by pass valve.
the by pass valve kicks in if the media can’t handle the flow demand be it becuase of cold weather geling or even bio matter from bio blends . Once the bypass valve kicks in, your injectors become the fuel filter.
yes…I think that is the one with the by pass valve.
the by pass valve kicks in if the media can’t handle the flow demand be it becuase of cold weather geling or even bio matter from bio blends . Once the bypass valve kicks in, your injectors become the fuel filter.
And, I still maintain that you are incorrect about how that works.
Plus, that literature that you posted about the bypass was on the 4625 filter number.
Plus, that literature that you posted about the bypass was on the 4625 filter number.
The bypass has been in circulation since 2021 or early 2022, it has kicking around for a while now.
I don't love it either honestly, dodge and GM at least give their end users a fuel heater but FoMoCo abandoned those 20 years ago, but given the recirculation valve at the tank, the amount of 10 micron fuel is somewhat limited and I haven't seen thread about injectors falling from the sky yet.
The pump is never "dry", diesel fuel is oil, it doesn't dry up very quickly, so even if fuel flow is down to the pump, there is still fuel in it coating the workings.
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