Why does the fuel pump run after the engine is shut off?
When the engine’s oil pressure reaches 4 psi or greater, the Oil Sending Unit turns on and manages the power supply to the electric fuel pump. If the Oil Sending Unit becomes defective, it often keeps the fuel pump running even after the car’s engine is shut off.
What happens when the fuel pump goes out on a Pontiac Sunfire?
There are physical signs that you can feel when your Sunfire’s fuel pump is going out. Before taking anything apart, check to see if your engine’s computer has any trouble codes saved in it. The engine may throw a P0087 trouble code. This trouble code detects that the fuel rail/system pressure is too low.
What are the symptoms of a bad fuel pump?
With that in mind, most of the symptoms of a bad fuel pump revolve around the vehicle stalling out or not running at all. In modern fuel injected vehicles, the fuel pump sits right in the fuel tank and “pushes” the gasoline to the fuel rail (s).
What causes a fuel pump leak in a classic car?
Fuel System Leaks. Most mechanical fuel pumps have a weep hole on the bottom of the unit. When the internal diaphragm leaks, fuel escapes through the weep hole to notify the vehicle owner of a malfunction. This is one of the more common fuel pump problems found in classic cars that are between 30 and 60 years old.
When the engine’s oil pressure reaches 4 psi or greater, the Oil Sending Unit turns on and manages the power supply to the electric fuel pump. If the Oil Sending Unit becomes defective, it often keeps the fuel pump running even after the car’s engine is shut off.
How can you tell if your fuel pump is failing?
If you ignore all of the other warning signs of a failing fuel pump, it will eventually fail completely. Once your fuel pump has finally given up the ghost, no fuel will reach your engine. You may hear your spark plugs firing when you try to start your car, but without fuel, the engine won’t be able to turn over.
Fuel System Leaks. Most mechanical fuel pumps have a weep hole on the bottom of the unit. When the internal diaphragm leaks, fuel escapes through the weep hole to notify the vehicle owner of a malfunction. This is one of the more common fuel pump problems found in classic cars that are between 30 and 60 years old.
Why do you need a fuel pump in a car?
Your car’s engine needs a regular stream of fuel to keep it humming along. The fuel pump feeds fuel to the engine at a reliable rate; without this pump, your fuel would just sit in your tank, useless and inert.