contaminated coolant
 

i just got a 94.5 f350 with a 7.3 powerstroke..when i got it i was told the turbo needed replaced.i found the turbo is fine,i had 6 loose injectors,2 of them were missing the copper seal and lower o ring was burnt up.. i replaced the o rings and glowplugs,then the truck ran pretty good.after a good drive the truck idles rough but drives great down the road..i still think i am getting bad fuel milage..

now the problem i am having is i noticed the coolant is black and smells like diesel fuel..i changed the oil and fuel filter,fuel in the filter bowl was black, oil was black with no signs of water.. also if you try to open the rad cap, the coolant is under pressure as soon as the engine fires up

i am thinking that i have bad injector cups because the coolant smells like fuel, but the black coolant in the rad says the oil cooler is leaking oil in.oil has no water in it...

could it be black fuel leaking in the coolant? the fuel in the filter bowl was black,and the fuel that blew out of the exhaust when i got it with leaking injectors was black..
when i bought the truck both tanks were full, i really don't know what is in there..

.. does any one have any ideas? i just made $200 and was about to replace the injector cups,i cant afford to fix anything that isn't broke and im stumped..

i have been a gas mechanic all my life..i have only been into diesels, specifically powerstrokes, for 2 weeks.so im learning fast here..