This particular truck came in with the coolant cap replaced because the rubber seal was all deformed from reacting with the petroleum. Often, when you remove the cap from the truck, this seal will be deformed and expanded from reacting with the petroleum. During your under-hood inspection, if you see your coolant bottle is overfilled or overflowing in any way, pop the coolant cap off and inspect it. This bottle is cracked and broken down from the petroleum reacting with the plastic. It is important to identify fuel in the cooling system early because the longer it stays in there, the more damage it does to all the rubber components of the cooling system. Usually, fuel will overtake the cooling system and push past the cap. The number one indicator of a problem with an injector cup is fuel in your coolant. This video addresses how to identify the problem, how to diagnose the problem and how to repair the problem. Because of the higher pressure of the fuel system, the fuel goes into the coolant. When the injector cup fails, you will no longer have a seal between the fuel system and the coolant system. The injector cup seals the cooling system from the injector inside the cylinder head. Injector cups are a very vital part of the internal workings of a Powerstroke diesel engine, whether it is a 6.0L or a 7.3L.
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