The purpose of the inertia switch is to cut the fuel supply to the engine in case of an accident. Triggered Fuel Cut-Off Inertia SwitchĪll cars made roughly after the year 2000 have an inertia fuel cut-off switch. And if the fuel pump is not getting power, in case you test it with a multimeter, the ignition switch should be your primary target. Plus, the dashboard warning lights may not light up, but that could also be a dead battery. That means when the ignition switch is faulty, you also won’t be able to crank the engine. Moreover, the ignition switch also sends a signal to the ECU to turn on and to the starter motor. However, ignition switch failure is extremely rare. So, if you were wondering can a bad ignition switch cause no power to the fuel pump, the answer is positive. So, with a faulty ignition switch, there is no signal going to the fuel pump, and it cannot work. We already mentioned that the ignition switch sends a signal to the fuel pump to turn it on. So, even if the fuel pump suddenly stopped working, it can still be the cause. That said, it’s not uncommon for the fuel pump to work properly the entire time before it simply refuses to turn on one random morning. Those include a check engine light, poor performance, difficulty starting the car, random stalling, rough idle, and hesitation or jerking. That said, there are usually some other symptoms that show up before the fuel pump dies outright. The fuel pump is a mechanical component for the most part which means it will fail inevitably. So, if the fuel pump relay is faulty, which happens pretty often in older cars, the fuel pump can’t work. When you turn the ignition on, it sends a low-voltage signal to the relay, which then closes the main fuel pump circuit and turns it on. We can consider the relay as the primary switch for the fuel pump. The fuel pump relay is integral to the entire fuel system. So, here is what causes the fuel pump won’t turn on, explained in more detail. ![]() Replacing a bad fuel pump can get pretty expensive however, there are three other things that could be causing this problem that are pretty cheap in most cases, if not free. ![]() What Causes Fuel Pump Won’t Turn On With Ignition And, of course, it could be a dead fuel pump. If a fuel pump won’t turn on with ignition, it could be a faulty fuel pump relay, a bad ignition switch, or a triggered fuel cut-off switch, also called an inertia switch. As a matter of fact, there are several reasons why this that might happen. So, if the fuel pump isn’t turning on, it doesn’t necessarily mean it’s faulty. That means the fuel pump is getting a signal from the ignition. The fuel pump turns on and starts pressurizing fuel as soon as you turn the ignition on, even before you start the engine.
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