Fuel filter change.
Senior User
Joined: Jun 2017
Posts: 324
Likes: 8
From: Austin, TX
Hotshot
Joined: Apr 2013
Posts: 10,119
Likes: 652
From: NH
The connections at the filter are low pressure. On this truck, the exhaust manifold is in the vee...fire danger from fuel coming out of the filter area seems very low
to me. Not saying it isn’t possible, but seems unlikely.
to me. Not saying it isn’t possible, but seems unlikely.
Mountain Pass
Joined: May 2017
Posts: 128
Likes: 2
From: Austin
I replace mine a couple of weeks ago. First time for me and watched a youtube video first 
Maybe got two quarts from the water separator and then replaced the one under the hood. Primed it 8 times before starting. Filters ran $95 from the dealer and took more time to drain the water separator than it took to replace both filters.
Maybe got two quarts from the water separator and then replaced the one under the hood. Primed it 8 times before starting. Filters ran $95 from the dealer and took more time to drain the water separator than it took to replace both filters.
Senior User
Joined: Jun 2017
Posts: 324
Likes: 8
From: Austin, TX
I'm in final prep for my first fuel filter swap (15K miles). Anyone remove the cable from the negative battery terminal first? The only reason I can think to do so would be to eliminate the chance of the in-tank fuel pump from starting-up while things are open. I don't see any reason for the pump to start-up but disconnecting the negative battery was part of the boiler-plate Ford workshop manual procedure. Thanks.
Senior User
Joined: Jun 2017
Posts: 324
Likes: 8
From: Austin, TX
As for the coalescing filter, it seems I'm siphoning my tank (I drained out close to a gallon with no reduction in rate). My truck is a 7/20/2017 build so I thought I'd be able to avoid this. I'm going to run it down to a quarter tank and try again on that one here next weekend. If the lower tank level doesn't work I'll probably try breaking the vacuum by pulling the inlet connection on the engine-mounted filter. I'm not too keen to be pulling connections above the tank where I can't see all that well.
Junior User
Joined: Nov 2016
Posts: 85
Likes: 0
I just did mine this past week. Started down below and drained the water separator first. I got about a 1/2 gallon before it stopped. After that, it was pretty easy. I did not siphon out the fuel tank. I read somewhere that you should let the truck cool off after driving, as this will lower the pressure in the fuel system, but I can't remember where I saw that. My truck has a 9/16/2016 build date BTW.
More Turbo
Joined: Feb 2015
Posts: 699
Likes: 37
From: DFW
Maybe a easy solution would be to remove the fuel cap first to release any pressure in the tank.
I know it's probably vented but often the vent will hold positive (" of water pressure) on the tank.
I know it's probably vented but often the vent will hold positive (" of water pressure) on the tank.
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Senior User
Joined: Jun 2017
Posts: 324
Likes: 8
From: Austin, TX
Possibly. I think I read that for the 2018s (owners manual maybe) you're supposed to ensure the fuel cap is closed (to establish a vacuum on the tank side). Regardless, I expect attempting it at 7/8 full wasn't the best plan. I'll try again here in a few days. I'm just thrilled with how easy it was to swap the engine-mounted filter. That's a big money saver and super easy. It's great that we can do these routine maintenance things ourselves so easily. I'm really liking that aspect of owning this truck.
Senior User
Joined: Jun 2017
Posts: 324
Likes: 8
From: Austin, TX
Just to follow up: I tried opening the fuel cap and draining the separator at 5/8 full in the fuel tank (it still siphoned). I then dropped the fuel level down to 1/2 tank (via more driving this week) and when I tried again today it still siphoned. Then it occurred to me that maybe my Stant locking fuel cap might not be allowing much of a vacuum to form in the tank. I swapped back to the OEM fuel cap and viola the siphoning stopped. My hypothesis is the spring is a bit stiffer in the OEM fuel cap which allows a slight bit more vacuum in the tank before opening... just enough to prevent the siphoning. My hypothesis could be dead wrong but I thought I'd share my experience. The filter change was again very easy. Thanks for the help.
Tuned
Joined: Oct 2005
Posts: 391
Likes: 3
Just to follow up: I tried opening the fuel cap and draining the separator at 5/8 full in the fuel tank (it still siphoned). I then dropped the fuel level down to 1/2 tank (via more driving this week) and when I tried again today it still siphoned. Then it occurred to me that maybe my Stant locking fuel cap might not be allowing much of a vacuum to form in the tank. I swapped back to the OEM fuel cap and viola the siphoning stopped. My hypothesis is the spring is a bit stiffer in the OEM fuel cap which allows a slight bit more vacuum in the tank before opening... just enough to prevent the siphoning. My hypothesis could be dead wrong but I thought I'd share my experience. The filter change was again very easy. Thanks for the help.
I did get the under-hood filter changed with no issues.
Early build truck, after I found the thread, I disconnected the lines under the hood; still siphoning.
I have about 3/4 of a tank in it now. I will run that down to 1/4 and try again. When I do, I will remove the cap to see if that helps.
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