Fuel filter problems can also cause the Check Engine Light to come on. Some vehicles come equipped with fuel pressure sensors that monitor the pressure of the overall fuel system. A clogged fuel filter may cause low pressure, which will set off the Check Engine Light to alert the driver — if detected by the sensor.

What can cause low fuel pressure?

Typical causes for low fuel pressure include a dirty fuel filter, weak pump, incorrect tank venting, restricted fuel lines, a clogged pump inlet strainer and faulty electrical control.

How do you check for low fuel pressure?

Start the car and let it idle. Install a fuel pressure gauge, run the pump, and note the pressure reading. Then compare it to the manufacturer's specification. If the pressure is low, you should address that problem.

What happens if fuel pressure is low?

Decreased Fuel Pressure

Low fuel pressure can lead to engine misfires, low acceleration, rough idles, and engine stalls. If your check engine light is on and your car has been stalling out, you may have a fuel pump failure.

Related Question Can a bad fuel filter cause low fuel pressure?

Why is it bad to let your gas tank run low?

Leaving it constantly exposed to air can cause the pump to suck in air and generate heat. This can reduce the working life of your fuel pump significantly. Allowing your tank to run low can also make room for sediment to build up in your tank.

Does running low on gas damage the fuel pump?

Low Fuel Levels Can Damage Your Engine

Driving on low fuel levels also makes it possible for particles and debris to damage your engine or fuel pump. If there are any pieces of dirt in your fuel, they will settle at the bottom of the tank and are much more likely to end up in your fuel pump if your fuel levels are low.

What are the symptoms of a vacuum leak in a car?

Symptoms of a vacuum leak include the Check Engine light, rough idle, stalling and a hissing sound coming from the engine bay. The engine may run well at higher RPMs, but surges, runs rough and struggles to maintain stable RPMs at idle. Often, the engine stalls when stopping.

How do I know if my fuel pump is working properly?

Why is my car using more fuel than usual?

Your spark plugs are responsible for sparking combustion in your engine. If they misfire, or are working poorly, this can affect your gas mileage in a negative way. Having bad fuel injectors can cause bad mileage. This causes more fuel to be used, and will use up more gas than you need.

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