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Duramax 6600 Discussion Forum for the Duramax 6600 Diesel Engine, including the LB7, LLY, LBZ & LMM engine specific topics.

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  #1  
Old 10-15-2006, 05:41 PM
upsguy upsguy is offline
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Default Draining water from fuel filter

Should you only have to worry about draining water from the fuel filter if you get the message that there's water in the filter, or should you occasionally drain the filter to remove any water that could be there?
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Old 10-15-2006, 06:35 PM
mark45678 mark45678 is offline
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its not a bad Idea to open the water drain every few tank fulls of fuel , some owners have complained about there water in fuel light not working..... If you have water you need to deal with it ASAP and the winter time isnt when you want to have it happen!
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Old 10-15-2006, 06:52 PM
upsguy upsguy is offline
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Do you have to prime the filter after you open the drain valve to let a little drain out?
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Old 10-15-2006, 07:18 PM
mark45678 mark45678 is offline
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yes, open the purge plug (its plastic go easy on it) drain off a little and close the drain hit the primer two or three times you should see fuel at the purge plug, close it hit the primer afew time until it gets firm. Honestly I do mine at oil changes and thats about it. so maybe ever 5000 mile.
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  #5  
Old 10-15-2006, 11:24 PM
DmaxMaverick DmaxMaverick is offline
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You don't have to open the bleeder. Just open the drain and pump the primer. This will pressurize the filter with fresh fuel, and force fuel/water/sediment through the water drain. Opening the bleeder and gravity draining will not always force water and sediment out. It needs help. The hole it comes through is quite small, and can be plugged easily (not to mention very slow). Opening the bleeder to drain also allows air to enter, which can be an issue of its own.
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