Why is my fuel pump running when my car is off?
A fuel pump that stays on when the ignition is turned off can be caused by a few things. If you do not believe that the behavior is normal, then it may be possible that the the ignition switch or fuel pump relay have shorted and are feeding power to the pump.
Will a bad ignition switch cause no power to fuel pump?
If the ignition relay shorts, burns out, or otherwise fails while the engine is operating it will cut off power to the fuel pump and ignition system. This will cause the vehicle to immediately stall due to fuel and spark being cut off.
What would make your fuel pump run continuously?
The most common cause of fuel pump failure is frequently running the tank low on fuel, which causes the motor to overheat. The second most common cause is fuel contamination, usually dirt and rust particles that clog the fuel strainer and prevent the pump from drawing enough fuel under high engine load.
Why does the fuel pump stay on when ignition is off?
Fuel pump stays on when ignition is off. The trigger for the relay is grounded through the ECM. The ground is provided electronically for a few seconds when the key is turned on and is maintained after that due to a pulse from the ignition module. It could be due to an erratic fault in the ECM.
When is the fuel pump relay turned on?
The fuel pump relay is an important component of the fuel system of your vehicle. The fuel pump relay gives the fuel pump power when it is time to build up fuel pressure in the rail. Whenever you turn on the ignition of your vehicle, the fuel pump relay is turned on. There are different reasons due to which the fuel pump relay fails.
Can a bad ignition coil cause a bad fuel pump?
I f there’s no spark, you may have a bad ignition coil. If it sparks, you may have a bad fuel pump. Ford vehicles—and some other makes—use an inertia switch to shut off the fuel pump when the car is involved in a collision.
What to do when your fuel pump is not delivering fuel?
Cover the valve with a shop rag and use a small screwdriver to depress the valve. Use the rag to catch the squirt of fuel. If there’s fuel in the line, it just confirms that the fuel pump is delivering fuel, not necessarily the right amount, though.