Why is the oil pump on my GMC Envoy not working?
Why is the oil pump on my GMC Envoy not working? The oil pump is responsible for taking the oil from the oil pan and pumping it through your Envoy’s engine. When it begins wearing out, its ability to pump oil will be diminished. There is a screen in most oil pumps that keeps large debris from entering. Where does the oil pump go on a GMC Truck? After pulling the pump out. there is an o ring that goes in there, sealing the pickup tube to the pump. its REALLy easy for the oring to fall out when you...