Ford 2020 F-25 6.7L

In my infinite wisdom, i attempted to drain the Diesel water separator, but my brain was shut that day . WHY ..because i had a FULL tank of Diesel and after draining 4 1/2 gallons ,the light bulb lit up .

I WAS SIPHONING THE TANK . never walk away from a draining water separator filter (lucky it was a 5-gal bucket) ...DAHHHHH

So the next step , after i closed the drain was to use all the Diesel till i reached only 1/4 tank.

I parked the truck in my driveway NOSE UP , (slanted driveway) and opened the 3 engine Diesel fuel filter lines first. Then went under and started the Water separator draining.

Low and behold only about 1 to 1-1/2 quarts drained and then stopped completely.

Replaced both filters and no leaks. Lesson learned


BTW..... Ford had some trouble with the FD-4625 engine filters. They did not take the engine heat very well and some leaked ...MINE INCLUDED. Lucky the leak was slow and smelly.

The latest replacement series FD-4647 is stronger and takes the heat better.

2/20/26 additional thought to ponder............. what broke the siphon effect. Was it the 1/4 tank of diesel and the driveway slant .....or was it the fact that that i broke suction by opening all 3 connections at the engine compartment diesel filter ...your thoughts ??

 

lesson learned, i hope you didnt beat yourself up too badly.
myself- i drain out maybe a cup at most, but i haven't done it for some time so thanks for reminding me

 

--cup at most you are referring to only water ? .......i'm not talking about a CUP OF WATER . i mean the Diesel gas tank holding 34 gallons.

 

Opening the top filter connections first made the difference, but doing the job on a low tank level is still a good idea.
I like the camper quote! Hard to hit a moving target!

 

i agree with you on the top 3 connections . Robert...
Hope the Blizzard didn't hit you too hard this weekend 2/21/26
Regards (n2ffs)

 

Only got about 10” of the white stuff this go round, way less then the weather guessers predicted.