Of course in order to be able to replace your fuel pump by going to an auto parts store you will first need to recognize the problem.
Electric fuel pumps and mechanical fuel pumps work in slightly different ways so you need to know what kind your car uses. If you have an electric fuel pump then this will pump the fuel tank to the injectors and this will require a high amount of pressure so that the injectors can spray into the engine. Normally electric fuel pumps are inside the gas tank, and some will have two.
The first thing to listen for to identify problems with an electric fuel pump is engine 'hesitations' while the engine is running and misfires. At the same time you might notice that when you try and put your foot down on the gas you don't get quite the acceleration you normally get. These are all symptoms you might expect of a car that isn't getting all of its fuel in a steady flow as it should because it isn't being pumped through in such a manner.
At the same time you might find that the vehicle stalls and restarts when the engine cools, or that it might crank and not start at all. These are all signs that you have a problem with your fuel pump.
If you have a mechanical fuel pump however then there are a few other things to look out for. A mechanical fuel pump pumps the gas from the gas tank into the carburetor when you start the engine. The common signs of a damaged mechanical fuel pump are the engine not starting or low power. You can also try by checking the oil as there is a diaphragm in the pump which can rupture over time and this way cause gas to link into the crank case. When this happens the gas will then cause the oil to become thinner and raise the amount. Another sign then is that you have oil that smells faintly of gas. If you have a mechanical fuel pump then and you find the car won't start or you have low power, then you should check the oil for these signs to identify the problem.
In either scenario (whether you have an electric fuel pump or mechanical) you might also notice that you have dry spark plugs. After you have run the engine you should then check the spark plugs to see if there is fuel on them. If they have no fuel on them, then this might mean that the fuel pump is not pumping the gas to the engine. This however is only the case in a completely inoperable fuel pump as opposed to just a partially damaged one.
If you have a damaged fuel pump then you will need to replace it with a new one. You can do this by visiting a auto parts store or by looking for auto parts online. If you are looking for auto parts on our site then at be sure that you check the fitment notes to ensure that you are getting the right part for your vehicle.