Detroit 60 coolant in fuel/water separator only

Hey All,
Hope someone can shed some light on this for me. 2005 Detroit Series 60 14L Egr. Last few months I noticed the need to change filter faster than usual in Davco fuel/water separator. Unit is a Davco 382 heated via coolant. Seems every 4 thousand miles or so the bowl is full and filter needs changing. Upon draining fuel I notice definite clean red ELC coolant coming out of the drain, about 4 - 6 ounces worth. Eventually it clears and just pure fuel pours from drain. Truck does not require much topping off of coolant but does get slightly low.

What would cause this? There is absolutely no coolant in oil, and no fuel in coolant whatsoever. Coolant Reservoir is 100% pure. There are no return lines to the Davco. Fuel in, Fuel out, Coolant in, Coolant out. My thinking is the only way for coolant to be present in the davco would be via the fuel tanks but in that case the truck would be using lots of coolant for it to travel thru the whole motor, back to the tanks and then to the Davco. Given these facts, I find it hard to believe the cause would be head gasket, injector cups or O-rings. Could the Davco itself be the culprit? What keeps the coolant separated from the fuel in the unit itself.

Truck runs fine.

Any input would be greatly appreciated!

 

Thank you both for your replies, very much.

CondoCruiser, after much research, #6 on first link you provided is the part number (380072) for the Vent Cap and Cover O-rings. Nowhere can I find a part #, or even mention of O-rings for the tube on heat plate. I have searched all of Davco site and the only mention of anything close is they state "radiator O-rings come with bottom plate upgrade". Do you know for a fact there are O-Rings for tube on heat plate? If so, are they replaceable? I'm beginning to wonder if I should just replace the entire bottom plate, perhaps the tube itself has a deterioration pinhole in it.

 

Thanks Freightlinerman, I was going to try vice grips but truck has "plastic" fuel lines going to Davco and Im afraid of cracking them. They are long enough that I may be able to disconnect them and actually raise the ends as high as the reservoir, hope so. Failing that, I may try the old method of shoving a bolt up the line and temp clamping it with a hose clamp. Im tellin ya, they should be required to put shut off valves on situations like this, so much for the precious environment now huh! LOL

Im open to suggestions though cause im gonna try like heck to not drain the entire cooling system.

 

Yes, the coolant lines. Perhaps they are in fact silicone, they just look plastic, orange plastic. That being the case, I would imagine vice grips will not crack them, even in the cold. Both the fuel and coolant lines are orange in color and have a plastic look to them with not all that much flexibility, or at least not as much flexibility as rubber. They look and feel same as plastic air lines, but orange in color.

No matter, I`ll get thru it, I just very much hope to find these O-rings and even more so hope this is the problem. I will keep everyone posted and take pictures just in case someone else may need in the future.

 

Just for any other "lost souls" out there that may be in need.

http://www.davco.com/pdf/parts/1344.pdf

Once again, I thank you all for the help and hope I can return the gesture one day!