Fuel Filter Dual Tanks
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Fuel Filter Dual Tanks
I was about to replace my fuel filter(s) in my 87 f150 inline 6 today but I was surprised to only find one. I have dual tanks and so I guessed I would find two filters. But upon furthur inspection I only found one which wouldn't trouble me except that it seems that one of the fuel lines just bypasses the filter altogether. Am I missing something? Am I looking at the right part? The part I am looking at is on the drive side frame rail below the oil filter and a little behind.
Thanks,
Blindlightguy
Thanks,
Blindlightguy
Senior User
Joined: Feb 2004
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From: Miami
No, that is correct...
The two fuel lines you are seeing are the fuel feed to the engine (the one that has the filter) and the Fuel Return back to the tank(s) which does not have a filter.
The Valve that selects which tank you are drawing fuel from is on the same frame rail as the filter and pump, but further back (like where the cab meets the bed). Since the Tank selection is done back there, there is only one fuel feed going from the selector through the fuel pump and filter and up to the engine.
The two fuel lines you are seeing are the fuel feed to the engine (the one that has the filter) and the Fuel Return back to the tank(s) which does not have a filter.
The Valve that selects which tank you are drawing fuel from is on the same frame rail as the filter and pump, but further back (like where the cab meets the bed). Since the Tank selection is done back there, there is only one fuel feed going from the selector through the fuel pump and filter and up to the engine.
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Joined: May 2004
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From: Tucson
Only one fuel filter...
I have done the filter on my 1991 dual tank F-150/300. There is only one external fuel fitler exactly where you're described it.
Note also that this really isn't and issue because intake tube on the fuel pumps (inside the tanks) also have a pre-pump filter. Actually more like a fuel screen, looked to me like a small vacuum bag.
My other .02 on the filter:
The fuel filer will be under pressure when you go to disconnect it. When I do mine, I run my truck without the fuel pump having power (trigger the inertia switch or remove fuses). When the truck stops running from no fuel, the frame rail filter you are going to change is under less pressure. Note that I said less. The first time I changed mine I wasn't thinking and my shirt became a filter element.
Mike
Note also that this really isn't and issue because intake tube on the fuel pumps (inside the tanks) also have a pre-pump filter. Actually more like a fuel screen, looked to me like a small vacuum bag.
My other .02 on the filter:
The fuel filer will be under pressure when you go to disconnect it. When I do mine, I run my truck without the fuel pump having power (trigger the inertia switch or remove fuses). When the truck stops running from no fuel, the frame rail filter you are going to change is under less pressure. Note that I said less. The first time I changed mine I wasn't thinking and my shirt became a filter element.
Mike
2nd Gear
Joined: Jul 2015
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It is an issue....
I have done the filter on my 1991 dual tank F-150/300. There is only one external fuel fitler exactly where you're described it.
Note also that this really isn't and issue because intake tube on the fuel pumps (inside the tanks) also have a pre-pump filter. Actually more like a fuel screen, looked to me like a small vacuum bag.
My other .02 on the filter:
The fuel filer will be under pressure when you go to disconnect it. When I do mine, I run my truck without the fuel pump having power (trigger the inertia switch or remove fuses). When the truck stops running from no fuel, the frame rail filter you are going to change is under less pressure. Note that I said less. The first time I changed mine I wasn't thinking and my shirt became a filter element.
Mike
Note also that this really isn't and issue because intake tube on the fuel pumps (inside the tanks) also have a pre-pump filter. Actually more like a fuel screen, looked to me like a small vacuum bag.
My other .02 on the filter:
The fuel filer will be under pressure when you go to disconnect it. When I do mine, I run my truck without the fuel pump having power (trigger the inertia switch or remove fuses). When the truck stops running from no fuel, the frame rail filter you are going to change is under less pressure. Note that I said less. The first time I changed mine I wasn't thinking and my shirt became a filter element.
Mike
Fleet Owner
Joined: Oct 2005
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From: Kentucky
I have never heard it is a water separator. It's strictly for filtering.
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Front tank seems to not be getting fuel. Whenever I switch from my third auxillary tank in bed or even my rear stock tank to the front tank..it drastically loses power and feels like it's gonna give. Even with a full tank of fuel. Does each tank have a separate pump and filter? What does this sound like?
Thanks
Thanks
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New User
Joined: Feb 2018
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Snowgoose96, Did you ever figure this out. I am having the exact same problem with my 96 F250 with dual tanks. I was thinking possibly separate fuel filters, but this thread indicates there is only one.
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Your 96 has a high pressure fuel module in each tank and no “canister”. Still one filter though, as the delivery lines to the motor come together before reaching the filter.
So your fuel fuel filter question is answered with, your stock truck’s fuel system has one external fuel filter also.
Your fuel deliverly issue will be diagnosed differently than the OP’s. If you can hear your pump running when switched on, start by testing fuel pressure on each module with key on and motor off during (during the 3 seconds before they cycle off, cycled a few times), and then start a thread with your pressures and issue would be my suggestion. It’s not uncommon for fuel modules to fail. If a pump isn’t turning on at all, you will also want to make sure it’s getting power to it before you get too far, switches go bad too.
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