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I am working on 2 trucks that almost have a similar problem,

one is a gmc with...
I am working on 2 trucks that almost have a similar problem, one is a gmc with a cat 3125 in it. It is hard to start and usually blows a lot of while smoke at start up and sometimes while driving. The other truck starts and runs fine but blows a lot of white smoke down the road until it warms up, it has a cat c13. Any ideas where i should start?
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Answered in 50 minutes by:
8/13/2019
Technician: Cat Man, Cat Engine Expert replied 3 years ago
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 10,344
Experience: I am ASE Master Truck Certified.
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Thanks for asking your question. I will try and help you out.
Can you get me the engine serial numbers please?
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Customer reply replied 3 years ago
HEP32690 for the 3126. Will get the c13 shortly
Technician: Cat Man, Cat Engine Expert replied 3 years ago
Thanks for asking your question. I will try and help you out.
There are very different engines.
On the 3126. I would suspect the fuel is leaking down. I see this a lot. When this happens. It’s caused by a faulty fuel pressure regulator on the back of the head. Or faulty fuel pump.
For the C13, I would suspect a sticking Iva.Please reply back if you need more help. I am happy to assist.
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Customer reply replied 3 years ago
How do i test the fuel pressure regulator and pump?
Technician: Cat Man, Cat Engine Expert replied 3 years ago
Unfortunately the reg can’t be tested. Just the fuel system pressure.
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 10,344
Experience: I am ASE Master Truck Certified.
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Customer reply replied 3 years ago
Does the heui pump need need to be timed?
Technician: Cat Man, Cat Engine Expert replied 3 years ago
No. It’s not timed. Just gear driven.
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Customer reply replied 3 years ago
Thank you. Is there a way to test the pump? I got one but just want to make sure first before i change it out. I changed the regulator and no change, so this is my next step on the 3126
Technician: Cat Man, Cat Engine Expert replied 3 years ago
Unfortunately not for leaking down.
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Customer reply replied 3 years ago
Thank you
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