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Old 09-17-2019, 06:51 PM   #1
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Fuel Filter maintenance

I have a 2013 FW Expedition with a Cummins 6.7 and need to change the fuel filters.

One filter is the engineís and one (water separator) is the chassisí. Do I just take them off or do I need to shut something off first? Clamp the hoses? Is there a valve? I have had it seviced before but now I have the time to do it.

Thanks.
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Old 09-17-2019, 09:39 PM   #2
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Generally just remove them, no shut offs. Definitely don't want to clamp the hoses. Just follow the procedures, some want the filter pre-filled some don't. Also make sure you lubricate the o-ring. My Cummins 8.3 they want it installed dry.
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Old 09-18-2019, 07:41 AM   #3
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Thanks.
Iíll let you know how it goes.
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Old 09-18-2019, 04:10 PM   #4
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Got it done.
Now it wonít start.
Ideas.

I see that I might have to bleed air out of the fuel line.
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Old 09-18-2019, 04:12 PM   #5
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Generally just remove them, no shut offs. Definitely don't want to clamp the hoses. Just follow the procedures, some want the filter pre-filled some don't. Also make sure you lubricate the o-ring. My Cummins 8.3 they want it installed dry.
Quite a few folks either clamp the hoses or install valves to keep from getting diesel fuel spilled. Many mechanics clamp the hoses as well. The only issue with that is if they are old and brittle they may slough off material. At that point they should be changed anyway.
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Old 09-18-2019, 08:48 PM   #6
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Got it done.
Now it wonít start.
Ideas.

I see that I might have to bleed air out of the fuel line.
When you prime the fuel system before starting the engine do you hear fuel entering the filter? I have no experience with your engine but I have a truck that requires 2-3 rounds of turning the key to accessory mode (and waiting) before I finally hear the filter completely full of diesel.
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Old 09-19-2019, 04:57 PM   #7
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My unit took at least 5 cycles until it fired off. Make sure you wait long enough when you cycle the key. Should hear the pump each time.
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Old 09-19-2019, 06:12 PM   #8
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If I remember correctly, the ISB fuel filter housing has a manual pump on top, and a bleed screw to allow air to escape. When fuel comes out of the bleed valve just close it, and attempt to start again.
Don't give up, the pump takes a while. This should be in your Cummins engine manual.
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Old 09-19-2019, 06:35 PM   #9
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Which one?
Found a bleed valve on the water separator.

The manual doesnít really talk about it.
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Old 09-19-2019, 09:10 PM   #10
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Well, I was wrong, that is only for the ISB 5.9 engine. The 6.7 is different, it is primed as thomasd923 stated, 5 key cycles, allowing the lift pump to run through its cycle each time, then start on #6.
Sorry for the misdirection.
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Old 09-20-2019, 03:50 AM   #11
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Tried that. Didnít work. Unless I am doing it wrong.
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Old 09-20-2019, 09:58 AM   #12
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Having a diesel mechanic come look at it today.
Iíll let you all know what he finds and does.
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Old 09-21-2019, 07:34 AM   #13
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Well, Diesel Dan came out and had a look. He showed me a priming pump/bulb on top of the water separating filter. He pumped it about 20 times, went in and cranked the engine about 1/2 minute and it fired right up. Whew!
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Old 09-21-2019, 07:50 AM   #14
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Glad you're back in business and thanks for the update

Will certainly help someone else
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