I found this. "The one weakness with the 6.9L is the water-fuel separator. The bottom valve tends to leak---fuel out and air into the fuel system. A new unit costs about $200 new, and there is no guarantee how long it will last. It is a poor design which was fixed later on. I have a $3.50 fix for the problem. Add a 3 inch piece of fuel line on the drain nipple with a stainless steel hose clamp. At the end of the 3 inch piece of fuel line place a small 1/4 inch brass needle valve (the type used for evaporative cooler water lines) onto the end (with a stainless steel hose clamp). To the other end, place fuel line which is weaved through the firewall and ends up sticking out 1 inch into the drivers side wheel well. Make sure you attach the second, longer piece of fuel line with a hose clamp to the valve. In order to attach the fuel line to the water seperator, the separator assembly must be removed from the vehical and drained. In order to drain the water out from the separator, simply open the brass valve, and then pull the ring on the water separator. The water/ diesel mix will drain as before. Close the brass needle valve, then let the separator ring seat itself. This will allow diesel to fill the void in the fuel line, to ensure there is no air in the fuel system to cause rough running in the future. The operation is done."
But I was reading an o-ring at the top leaks around the "pull ring shaft."
