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Like head gaskets that are corroded thru. I hope not. I would get a good cooling system pressure tester and pressure test the cooling system. See if it holds pressure or drops pressure. Good Luck. I am thinking injection pump. But to make sure check everything closely.

Remove the check valve on the top of the injection pump. It is the black fitting with the hose coming off the top of the pump. See if you see particulates of black rubber in the fitting. Break the glass ball in the check valve and see if it runs any better. I think your injection pump has an...