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Well, do you have the Davco primary, or the proprietary Volvo one?

If you have the Davco, it's probably mounted on the right side of the vehicle, at the front of the engine compartment. Put a bucket underneath it to catch the fuel, and feel around the bottom and front.. there's a small plastic lever, in something of a reverse "L" shape... push down on it, and it'll drain the fuel. To get it out more smoothly, remove the breather cap.. you'll want to get a Davco wrench for this... you can buy them at any truck dealership or diesel shop... be careful, as there are three sizes of Davco wrenches... all the ones I've seen on trucks are the medium size.

If you have the other style, it'll be located on the left side of the vehicle, directly behind the suspended canister secondary fuel filter.. there's a knob on the bottom... rotate it counterclockwise, and it'll open up.

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Q: How do you drain fuel water separator on Volvo 870 semi truck?
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