Symptoms of a Bad Fuel Pump in a 1999 Ford Taurus

by Teshia Washington
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The fuel system in a 1999 Ford Taurus consists of a fuel pump, fuel supply manifold, throttle body, pressure regulator, fuel filter and fuel lines. A faulty Taurus fuel pump disrupts normal engine performance. Knowing the symptoms of a bad fuel pump makes diagnosis and repair easier.


The fuel pump lies within the vehicle fuel tank. Highly pressurized, the fuel pump supplies fuel to the system. Excessive fuel flows through the fuel regulator and back to the gas tank. A faulty fuel pump interferes with proper fuel system function.

Symptoms and Solutions

One symptom of a fuel pump problem is a non-starting vehicle. The Taurus contains a fuel pump shutoff switch. The engine fails to start if the switch has been activated. Resetting the switch restores power to the fuel pump. If the reset does not resolve the problem, then perform further diagnosis. To test fuel pump function, insert the key into the ignition. Rotate key position from off to run, without starting the engine. Under normal conditions, the fuel pump engages, emitting a low humming sound. Absence of this sound means the fuel pump likely needs replacement.


Examine and service the fuel pump in a well-ventilated location. Keep a fire extinguisher nearby. Avoid open flames or sparks while working. The 3.0-liter Taurus engine requires unleaded fuel with an octane rating of 87 or higher. The 3.4-liter Taurus engine requires premium unleaded fuel. Using low-quality or lower-octane gas can cause the engine to knock and ping.

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