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I have a 2000 GMC 6500 with a 3126 cat engine. We had a

Customer Question
radiator leak the other day...
I have a 2000 GMC 6500 with a 3126 cat engine. We had a radiator leak the other day and put a new radiator in. Since then water has been coming out of the cap at the overflow while driving the truck. The engine is running cool and we are not having to replace any water. I just noticed that there is Diesel fuel in the water that is dripping out and it is wet all over under the hood. In your experience, what is the most likely problem? And what is the best way to diagnose the problem?
Submitted: 1 month ago.Category: Medium and Heavy Trucks
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Answered in 25 minutes by:
12/28/2017
Technician: Cat Man, Cat Engine Expert replied 1 month ago
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 9,135
Experience: I am ASE Master Truck Certified.
Verified
Thanks for asking your question. I will try and help you out.
Diesel fuel in the coolant is caused by a failed injector cup o ring. I see this a lot.
You will need to remove and reseal the injector cups.Please reply back if you need more help or have more questions. I am happy to assist.
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Customer reply replied 1 month ago
What is the process to remove and reseal the injector cups?
Technician: Cat Man, Cat Engine Expert replied 1 month ago
There is a special Cat cup removal tool needed to remove and install the cups. Unfortunately the tool damages the cups upon removal. You’ll need to replace all the cups. The tool part number is(###) ###-####and(###) ###-####Please reply back if you need more help or have more questions. I am happy to assist.
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Customer reply replied 1 month ago
Is this a job better left to the professionals? We are fairly good mechanics. Also this truck has been very hard to star in the morning when cold. Would this condition have been causing the truck to be hard to start?
Technician: Cat Man, Cat Engine Expert replied 1 month ago
it will cause a hard start. That’s because the fuel is leaking down.
The dealer can knock this out in four hours or so. Can be tough is never done it before. Plus the tool is expensive.
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Customer reply replied 1 month ago
About how expensive?
Technician: Cat Man, Cat Engine Expert replied 1 month ago
The last time I priced them they were both around 700.
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Customer reply replied 1 month ago
Do you have any type of diagram That shows the injector, injector cup and head area? Also a part number for the cups themselves?
Technician: Cat Man, Cat Engine Expert replied 1 month ago
Let me see what I can find.
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Technician: Cat Man, Cat Engine Expert replied 1 month ago
Ask Your Own Medium and Heavy Trucks Question
Technician: Cat Man, Cat Engine Expert replied 1 month 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.
Ask Your Own Medium and Heavy Trucks Question
Technician: Cat Man, Cat Engine Expert replied 1 month 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.
Ask Your Own Medium and Heavy Trucks Question
Technician: Cat Man, Cat Engine Expert replied 1 month 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.
Ask Your Own Medium and Heavy Trucks Question
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Cat Man
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 9,135
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