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Depends on which fuel/water separator you have. If you have a Davco primary filter, look underneath the housing... there'll be an "L" shaped plastic knob... rotate it downwards to open the draincock. If you have a primary fuel filter with a snap-on plastic cap underneath it, there'll be a draincock on the bottom of it... rotate it counterclockwise (looking at it from the bottom) to open the draincock. Remember to leave the key in the "OFF" position as you do this (or just take it out of the ignition).

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Q: How do you drain separator for Detroit diesel?
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