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Old 11-17-2012, 01:04 PM   #1
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Alliance fuel/water separator

Alliance fuel/water separator - it was suggested on another of my posts to drain the fuel water separator prior to winter storage, I found the Alliance filter - how should I go about draining the water out? also how will I know the water is all drained out?


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Old 11-17-2012, 05:20 PM   #2
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There should be a petcock valve on the bottom of the filter which should allow you to drain the water out of the system. Most have a clear bowl on the bottom which should allow you to see the water, if in the system.

Don't totally drain the filter, as you are probably draining out perfectly good fuel.

Also, be sure to drive the coach after draining before putting away for the winter. This way, everything should be primed and ready to go for spring.

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Old 11-17-2012, 05:41 PM   #3
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Crack the drain and drain off a couple of tablespoons of fluid into a clear plastic baggie. If there is any water you will see it as the diesel will float on the top of the water and the water will be visible in the bottom of the baggie. You really don't want to drain off very much fuel as you may induce air into the fuel system. Unless you see a lot of water this is all you should need to do. If water is present start the engine and let it run for a few minutes then repeat the above.
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Old 11-17-2012, 07:31 PM   #4
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Old 12-06-2012, 06:11 PM   #5
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You should probably drain off the water while the engine is running to avoid inducing air into the fuel delivery system.
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Old 12-06-2012, 07:53 PM   #6
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As Douglas said, it's easiest to do it while the engine is running. If it isn't and you drain too much, you could un-prime the fuel pump which could make it very hard to start the engine after. If you do lose the prime some models do have a hand fuel pump in the engine compartment that you turn to prime again.

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