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Old 07-07-2019, 10:26 AM   #1
Dennis1554
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Default Fuel water separator Question

I have a question about draining the fuel water separator filter on my Cat-C7. When traveling, how do you dispose the fuel water mixture you get out? This diesel stuff is new to me, so I am trying to learn the tricks. I am not even sure how much to drain! Draining even just a little smells and looks like diesel. Iím looking for your experience and expert advice! Thanks!
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Old 07-07-2019, 04:18 PM   #2
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you may not have any water in your fuel, so therefore there is nothing to dispose of. The filter is there to separate any water from the diesel, but chances are you'll rarely have any. If you turn the knob and only 'diesel' comes out, then you close it and move on.
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Old 07-08-2019, 08:30 PM   #3
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Thanks! Well, I guess i’ll Get the hang of it. Not really sure if I am getting pure diesel or a mixture. May if I let it sit it will separate. The question on disposal pertained to whatever I drained out. I have been using a glass jar with lid. Won’t take long to fill it up. So what is the proper way to get rid of it? Can’t just put it in the campground dumpster. What do you experienced folks do?
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Old 07-09-2019, 05:56 AM   #4
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Quote:
Originally Posted by Dennis1554 View Post
Thanks! Well, I guess i’ll Get the hang of it. Not really sure if I am getting pure diesel or a mixture. May if I let it sit it will separate. The question on disposal pertained to whatever I drained out. I have been using a glass jar with lid. Won’t take long to fill it up. So what is the proper way to get rid of it? Can’t just put it in the campground dumpster. What do you experienced folks do?
With my diesel truck I always just let the water run on the ground. You are supposed to stop before the fuel starts coming out. If you have a small amount of emulsion put it in a plastic container and throw it in the dumpster. It's more biodegradable than a lot of other stuff in there.
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Old 07-14-2019, 10:07 AM   #5
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Just take a glass or plastic container. You will see the water is heavier than the diesel. But you have a controlled filter. Means you get a yellow flash light on the dash, when the filter contains water and it is needed to drain.
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Old 07-14-2019, 12:24 PM   #6
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Originally Posted by Dennis1554 View Post
Thanks! Well, I guess iíll Get the hang of it. Not really sure if I am getting pure diesel or a mixture. May if I let it sit it will separate. The question on disposal pertained to whatever I drained out. I have been using a glass jar with lid. Wonít take long to fill it up. So what is the proper way to get rid of it? Canít just put it in the campground dumpster. What do you experienced folks do?

All cities in California where I live have a place to dispose any hazardous materials. You do not dump it on the ground, that is for sure, because these liquids eventually will work their way into the drinking water tables.
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Old 07-15-2019, 11:40 AM   #7
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Dennis, try this experiment. Get a clear glass. Fill it 1/3 full of diesel. Then pour in the same amount of water. Water weighs 8.34 lb/gal. - diesel, 7 lb/gal. Do you think the water will stay on top of the diesel in the glass? Having made that observation, imagine there was a drain cock in the bottom of the glass. If you opened it, what would come out first - water or diesel? Same thing happens with your fuel/water separator. Drain a couple of oz and observe - diesel or water? If it's diesel, you have no water. Put the diesel back in your fuel tank. If it's water, throw it on the ground. Keep draining til you get diesel.
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Old 07-16-2019, 05:14 AM   #8
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Fantastic explanation, sometimes the obvious is not.

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Old 07-16-2019, 06:00 AM   #9
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Gasoline is classified as a hazardous waste and diesel fuel is not.
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