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Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 8634
Experience:  I am ASE Master Truck Certified.
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Cat C7: We have a c7 cat 225000 miles 2006 have fuel in antifreeze

Customer Question

We have a c7 cat 225000 miles 2006 have fuel in antifreeze and a lot of foaming
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Cat Man replied 1 year ago.
Hi. Thanks for asking your question! I will try and help you out.
Unfortunately I have seen this problem many times.
The most common thing that causes this is a failed injector cup O rings. When they fail, the fuel will enter the cooling system as the fuel pressure is much higher than the coolant pressure. To verify, all you have to do is remove the injectors and pressurizer the cooling system. If a cup O ring is leaking, you will see it.
I advise having all the cup O rings replaced. If one is leaking now, and you only replace one, there is sure to be another leak soon.
Please reply back if you need more help or have more questions. I am happy to assist.

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