Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hello there! I have some experience with these trucks and had similar issues when they came in. One possibility is the gear that drives the motor; which is chain driven, can slip off; another is the circuit board inside the injection pump itself can fail; finally the mechanical portion tends to wear prematurely causing the pump to lose the ability to open the pressure valve. In most cases this resulted in the need of the entire pump being replaced and re-timed.