What's the reason for the oil pump not making noise after turning on the diesel heater?
2 Answers
The reason the oil pump does not make noise after turning on the diesel heater is due to damage or blockage of the oil pump. Solution: Remove the oil pump and clean it. If it is damaged, replace it with a new one directly. The diesel heater, also known as a parking heater, is suitable for preheating diesel engines in cold regions, effectively solving issues such as engine failure to start or difficulty starting due to cold weather. Circulation components of the diesel heater system: The diesel heater system consists of two cycles: a combustion cycle and a heating cycle. Solution: In the combustion cycle, the oil pump draws diesel from the fuel tank to the combustion chamber, where it is ignited by the igniter. The large amount of heat generated by diesel combustion is transferred through the aluminum alloy fins on the outer wall of the combustion chamber, and the exhaust gas is discharged from the exhaust port. In the heating cycle, the fan draws in external cold air, which passes through the aluminum alloy fins on the outer wall of the combustion chamber and is heated into high-temperature air, then delivered to the cabin to increase the temperature inside.
I once encountered this situation when driving a truck. After turning on the diesel heater, the fuel pump wouldn't make a sound. I immediately realized that the first things to check were the fuel line and electrical circuit, because a silent fuel pump usually indicates a fuel supply issue, like insufficient fuel or a clogged fuel line. Back then, my tank was nearly empty, and I kept trying, which ended up damaging some components—a costly mistake. Another common culprit is a blown fuse, which is hidden in a small box under the dashboard and requires manual inspection. Replacing it isn't hard, but you must match the correct model to avoid short circuits. If the fuel pump motor is aging or jammed by debris, it can also go silent. In such cases, you'd need to disassemble and clean it, but I'd advise beginners not to tinker with it recklessly—safety first. I usually have a mechanic check the fuel pump during routine maintenance. Frequent use of diesel heaters in winter can lead to this issue, so address it early to avoid getting stranded on the road, which would delay your trip and cause unnecessary hassle.
