Coolant in fuel/water separator, and tanks.

I have a 2011 KW T 660, Cumminns ISX, 450 HP. Bought the truck 4 months ago with 485,000 miles on it. A few months after buying it I noticed when I toped off the tanks, fuel would be leaking on the ground. Then I started getting water in the fuel code. The water separator was plug up with junk in the bottom, (dirt), cleaned it out. Ehen I got home, had the tanks pulled, both tanks were cracked around the pickup tubes and fuel heaters. Had the drained, and welded. Leaks are gone. 3 fill ups latter, get water in fuel code again. I thought this might happen, system cleaning itself out and all. Drain the separator, was a little dirt, but the water was red, like coolant.

Ive vey changed the filter 3 times in 9000 miles, still getting water in fuel code. I do notice the coolant is dropping slowly. Checked the bottom of the tanks, you can see the red at the bottom of the tank.

The only thing I can think of is the tank heaters might be leaking coolant into the tanks. They may have been damaged when the tanks were cracked, the cracks were so bad, you could almost pull the tank heater off the tank. Only other thing I can think of is a cracked injector, or injector cup.

Any thought or help would be appreciated.

 

i was thinking bypassing the fuel heaters by blocking them off, run it a few tanks, and see if the coolant stays level, and no more in the fuel tanks/separator. Do you think that would be s good test?

 

I think it will take at least 4-5 tanks full to get rid of it. I can pump all the fuel out and filter it to clean it also.