What is the reason for the fuel pump not making noise after the diesel heater is turned on?

[Sophia]

There are several reasons why the fuel pump does not make noise after the diesel heater is turned on: Air in the fuel line: If there is air in the fuel line, it is necessary to wait until the fuel in the tank is exhausted. When the engine starts, it cannot ignite, so the fuel pump does not make noise. This is because the diesel fuel pump only operates when the engine starts. In this case, the hand fuel pump should be used to pump fuel from the tank into the fuel line. Severely worn fuel outlet valve: Replace the severely worn fuel outlet valve with a high-quality one. Some car owners may not be fully aware that diesel fuel contains some mechanical impurities. These impurities can cause certain wear to the fuel outlet valve during flow. When the fuel outlet valve is severely worn, the high-pressure fuel pipe will experience insufficient pressure. Replacing the worn plunger sleeve can restore the fuel injection pump to normal operation. Additionally, diesel fuel has a certain corrosive effect, which can increase the gap between the plunger and the sleeve during flow.