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Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 8909
Experience:  I am ASE Master Truck Certified.
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I have a cat 3126 in my 98 dutch star motor home getting

Customer Question

I have a cat 3126 in my 98 dutch star motor home getting fuel in coolant system
JA: What is the complete model and serial number of your machine?
Customer: Not sure the VIN is 4JZ6XJC44VC905403 if that helps
JA: Are you fixing this yourself? What have you tried so far?
Customer: No just trying to get a ideal at what I am looking at
JA: Anything else you want the equipment mechanic to know before I connect you?
Customer: engine is running good just pumping fuel out of coolant resevior
Submitted: 10 months ago.
Category: Medium and Heavy Trucks
Expert:  Cat Man replied 10 months ago.
Thanks for asking your question. I will try and help you out.
Unfortunately I have seen this many times before. There are two things that can cause this.The first and most common is a leaking injector cup. When this happens the fuel pressure is higher than coolant pressure so coolant will go into the fuel. You will need to replace all 6 injector cups. If one is leaking. The others are not far behind.Second is a cracked head. Cracked heads are extremely rare. I have only seen one do this in all my years.Please reply back if you need more help or have more questions. I am happy to assist.
Expert:  Cat Man replied 10 months ago.
Hey. I just wanted to see how things were going. Please let me know if you need more help. I am happy to assist. If my information was helpful, please leave a good or higher rating so that I receive credit. Thanks.