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Old 08-28-2012, 04:17 PM   #1
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1991 Monaco Signature L10 fuel water seperator

I tried searching this subject and even called Cummins, but I am not sure I understand still. I am using the napa alternative filter 3405 and it has a plastic knob on the bottom. I read in the manual I should empty it daily, but when I turn it I hear draining, but do not see anyting so I close it. Am I just bleeding off fuel pressure internally or should I give it longer unscrewed to see if anything drains? What do you do with these things? The RV is a 1991 Monaco Signature Series with an L10. Thanks for any help.
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Old 08-29-2012, 03:41 AM   #2
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As long as you are buying good fuel, you will not have any water in the fuel/water separator. I think you may also be able to see the water and fuel (fuel will float) in the bowl, if you needed to drain it. I rarely check mine anymore as I have never found any water in the fuel issues.
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Old 08-29-2012, 10:13 AM   #3
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X2 on what Mr. Wizard says. I'm surprised your manual says empty every day, mine says empty after each fill. Since it hardly ever has any water in it, I only do it once every 4-6 fills.
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Old 08-29-2012, 11:23 PM   #4
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Interesting

Is the coach level? What might be happening is that the filter is actually draining back into the fuel tank if the fuel tanks is 1) lower than the filter or 2) the fuel level is lower than the filter.

If so this would mean that your fuel pump would have to refill the fuel lines and filters when you start up the next time. No big deal if there is enough fuel to run the engine until that happens.

I agree with the previous post about making sure you get good fuel. Also, I use Lucas Oil as an additive in my tank which seems to help with a number of problems.

Eons ago, we used to always drain our filters in the diesel trucks when I was in the Army, but back then there was a lot of bad fuel. Not so much today.

I rarely drain my filter, always try to keep the tank near full, and get fuel from reputable sources. If you fuel up at a station and the filling rate is very slow I would stop and go somewhere else. This may not be correct, but it is possible in these situations that the tank is low and the pump is having trouble keeping a strong flow. When you get to the bottom of the tank there can be all sorts of thing down there and few of them good for your engine. If my guess on this is incorrect I hope someone will come along and set the record straight.

Chuck
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