Geo Prizm Fuel Pump
Troubleshooting Common Signs of Geo Prizm Fuel Pump Failure
The electric fuel pumps used in Geo Prizms can typically last for 100,000 hours before requiring replacement, but once they start to malfunction before that they should be inspected immediately and replaced if needed. Fuel pumps are an integral part of the engine fuel system, and once they break down fuel will be unable to reach the engine efficiently - or not at all. Symptoms of fuel pump failure are quite easy to spot, however, and in this guide we're going to show you how to troubleshoot common signs of an ailing Geo Prizm fuel pump.
The engine stalls or doesn't start
An engine that refuses to start or frequently stalls when the gas pedal is depressed is a common indication of a broken fuel pump, but these symptoms are also evident in other kinds of problems not directly related to fuel pump as well. So to determine whether the pump is truly at fault, park your Prizm in a quiet environment (such as in your garage or an enclosed parking lot) and turn it to the on position. If you can hear the fuel pump whirr to life, it's probably fine and the problem is most likely to be with the engine or in the other parts of your car's fuel system. But if it remains silent, the pump is malfunctioning and needs replacing.
The pump emits high-pitched sounds
Malfunctioning fuel pumps tend to emit an abnormally high-pitched whenever the engine is engaged. Some Prizm owners liked the sound to that of a tea kettle whistling, while other say it's more like nails scraping across the chalkboard. But whatever noise it makes, anything that sounds out of the ordinary that's coming out of your fuel pump should warrant an inspection.
Broken fuel pump relays
In a lot cases, problems with the fuel pump often occur due to a damaged or defective fuel pump relay. With the ignition on, check for incoming voltage at the relay connector using a test light. If there's no voltage, check for a short at the wire between the relay and the fuse panel. Next, jump the relay connector to apply voltage from the battery directly to the fuel pump and turn on the ignition. If the fuel pump works, replace the relay and test it again.