Why is oil pressure low on my C15 cat engine?
Why is oil pressure low on my C15 cat engine? Its good you verified the pressure with a manual gauge. Its possible there could have been a faulty sensor. Since the manual gauge reads the same as the sensor, I'm sure the pressure is low. There are three things I would suspect. First is a weak engine oil pump. Second is the pressure relief valve in the oil filter base is open. Why does my cat fuel pump keep going off? What Cat realized in late 2009 was the Safety relief valve in the pump was set too low and...