DD Series 60 coolant in fuel not visa versa

Hello,
Some of you maybe remember an earlier post by me. 2005 Series 60 EGR 14L. Bright, clean, red coolant is draining from my Davco fuel/water separator when I drain it. Fuel in bowl looks pristine. Davco 382 is heated type, originally I thought it was heated via coolant lines and there was an internal leak in the Davco but it is not. They are using the return fuel to heat the unit. Point being, there is no coolant running thru the Davco whatsoever.

The coolant reservoir shows no signs of fuel, or at least no detectable signs as far as visually or odor. Reservoir needs to be topped off about a half gallon per 1000 miles.

So now, the only possible place the coolant could be entering the Davco would be from the fuel tanks? If so, whats this mean? Injector cup?

Ive had injector cups fail in the past and they have always filled the coolant reservoir with fuel, but this seems to be the other way around. This is coolant into fuel, NOT fuel into coolant.

One other symptom is that truck is very hard starting, even above freezing temps, as if its loosing prime. Not sure if this is related.

Motor has 440,000 miles on the clock.

Any ideas???
THANK YOU!

 

Well here`s a bit of follow up. Took truck to Detroit Diesel. They are saying the injector cups (sleeves) are in fact the reason for coolant into fuel. No big surprise there. They also said the hard starting issue is from an injector going bad and with this model engine there is no way to test each injector. Dunno how much I believe that one. Says air is in fuel return line. They recommend replacing all injectors since motor has 440k miles on original injectors. Says injectors should be replaced about every 250-300K on this motor.

Boils down to:
Replace all inj sleeves
Replace all injectors (DD Remans)
Replace coolant
Top end tune up
All for the low price of $4500.00, all parts/labor have a 2 year/150K mile warranty.

Am I being ripped a new one? Or is this sound advice?