Medium and Heavy Trucks
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Unfortunately I have seen many heui pumps fail and damage the injectors. When this happens the heui pump will throw out metal debris into the injectors and cause them to fail. Since all the injectors were faulty and now they say the heui pump is failing with erratic pressure. I assume you have the same scenario. Bad heui pump and injectors. Unfortunately this is a known issue with the C7. The good news is the newer heui pumps are suppose to be corrected and better and should not chase failures like this in the future.
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