One of the do it yourself tasks of a car owner that may occur might be replacing a fuel pump.
Generally speaking, most vehicles today have electric fuel pumps located inside the fuel tank so that is the example used here.
On most cars the fuel tank is located under the car just behind the rear wheels.
The ideal situation would be to have the fuel pump malfunction when the tank is almost empty, but, it seems that almost never happens.
First things first; disconnect the negative battery cable.
Next, if the tank contains very much fuel, you may want to drain it.
It will make it easier to work with.
Now, you will need to raise the car.
When jacking up the car, be sure the opposite wheels are blocked to prevent rolling.
Support the car with blocks or jack stands.
Do not work under the car when it is supported only by the jack.
Now that the car is up high enough and supported safely you can start to loosen the bolts that support the tank.
Usually, there are two straps that hold the tank and the straps are held by one bolt each.
As the tank starts to loosen from its nest, look for the fuel lines and wires that will run up over the top of the tank.
You will also need something to support the tank so that it does not drop from the car onto the ground.
A transmission jack is great but most people do not have one sitting around.
One alternative is a wide board against the tank and a regular floor jack.
As the tank is lowered, slowly disconnect the fuel lines and wires.
Then remove the tank from under the car.
Clean all dirt and debris from the top of the tank.
The round ring somewhere near the center on most tanks is where the fuel pump is located.
There will be a locking ring that holds that assembly in place.
Once the locking ring is removed, carefully remove the assembly from the tank.
Take care to notice the orientation of the pump and strainer.
Replacing the fuel pump will be in the reverse order of disassembly.
Be sure the seal is in place on the assembly as you lock the unit back into the tank.