Loose Injector
Has any one heard of the Cummins 8.3 ISC having a loose injector causing combustion products to enter the return fuel going back to the main tank and causing the fuel to turn black, then clogging filt...
Forum Discussion
sjholt wrote:
After looking at this thread a second time, I see that "under the microscope there is a hard particle"?
That would mean to me that there is hot exhaust getting into the fuel system under high pressure. I would suspect a cracked head. Somehow the fuel is getting burned to create a hard particle.
Maybe a compression check would verify it? Maybe not. Is there a fuel passage way in the head?
If the filter changes/mileage remains the same, then I would just change them every so often and keep on driving.
JMHO
Changing fuel filters at 10k miles is what we have been doing as a precaution because we know they will be clogged by 12-13K.
Most of our maintenance was completed in the 2011-2013 / 20,000 -25,000 mile time frame, but the problem still exist at 43,000. this is always on our minds when we take it on the road.
The cracked head theory is a possibility but it is not supported by any other typical head cracked symptoms. no coolant disappearing, no coolant in the oil. type stuff.
