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Any answer you would receive would be contingent on what brand and model of car you are asking about, and the type of motor (for example, carburated or fuel injected). In the general sense, though, there could be a problem with the electrical connections to the pump, or the sensor that tells the pump when to turn on and when to stop. If you are experiencing problems with fuel pressure, there are other explanations than the fuel pump not working. A clogged fuel strainer attached to the pump, or a clogged fuel filter, for instance. In any case, remember to thoroughly syphon the fuel out of the tank before you work on it, for safety.

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Q: What can make the fuel pump not run when running fine before?
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