These sensors are used in a variety of ways. Other options are crank sensors and/or cam sensors. There won’t be any reference pulses if the motor is not turning. Some monitor reference pulses from the ignition module. Each manufacturer will use a different indicator that the motor is running. It is the primary component that allows our modern vehicles to run smoothly and efficiently. The PCM monitors all signals in the engine compartment. How does the PCM know the engine is running? If the PCM doesn’t see an indication of the motor running, it will not supply a ground path to the relay and the fuel pump will not receive power. The PCM chooses to turn the relay on when it sees the motor is running. The fuel pump relay is controlled by the PCM by providing the relay with a ground. They are entirely dependant on the fuel pump relay to provide them with power or remove their power. Fuel pumps themselves don’t know when to shut off. Larger vehicles such as a Chevy Silverado and its 6.6L Duramax engine will have more noticeable effects than something like a 4-cylinder Toyota Corolla engine.The are two main components that make most fuel pumps run: the PCM (Powertrain Control Module) and the fuel pump relay. Most of the time, too much fuel will be pumped into the combustion chamber and there will be a noticeable reduction in your MPG from running too rich. With a bad fuel pressure sensor, the engine will not receive the correct amount of fuel for its internal combustion process. If you previously had trouble starting your car but then got the engine to finally run, you may experience stalling as you’re driving later on.īut even if it is the first time the car has stalled, it could still be due to a faulty fuel pressure sensor. Sometimes you might get a not-so-nice surprise and have your vehicle stall as you’re driving it. But eventually, it may get to the point when it doesn’t start at all. If you try to start your vehicle’s engine and it doesn’t start on the first attempt, then your fuel pressure sensor may not sending a good signal to the engine’s computer.Īt first, the engine will eventually start after cranking a few times. This will cause a noticeable loss of power from your vehicle as you’re driving. If the sensor is bad, then it will interfere with the air and fuel ratio. If you step on the gas pedal and notice a lack of acceleration, then it could be due to the fuel pressure sensor. Of course, there are a large number of other reasons for why the check engine light would turn on besides having a bad fuel pressure sensor. Then it will activate the check engine light to let you know there is some kind of problem that is related to the engine. Sometimes the engine control unit will sense a problem with the signal from the fuel rail sensor. If you see the engine warning light illuminate on your dashboard, then it could be a sign that your fuel pressure sensor is bad. Below are the top 5 symptoms for you to watch out for in case the fuel pressure sensor of your vehicle goes bad. If there is something wrong with your fuel pressure sensor, then there are some easily recognizable symptoms that will become apparent to you. Common Bad Fuel Pressure Sensor Symptoms.
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