Symptoms of a Failing Fuel Pump:
* Engine cranks but won't start: This is a classic symptom. The engine turns over, but it doesn't catch and run. This is because the pump isn't delivering fuel.
* Hesitation or sputtering: The engine might run rough, hesitate, or sputter, especially under acceleration. This suggests inconsistent fuel delivery.
* Weak acceleration: The car might feel sluggish or slow to accelerate. Insufficient fuel pressure prevents the engine from performing optimally.
* Engine stalls: The engine might stall unexpectedly, particularly after extended running or when the fuel tank is low.
* Whining noise from the fuel tank: You might hear a buzzing or whining sound coming from the area of the fuel tank when the ignition is turned on. This is the pump trying to operate but failing. This is less common as the pump often fails silently.
* Fuel pressure test failure: This is the definitive test. A mechanic uses a fuel pressure gauge to measure the pressure in the fuel system. Low pressure indicates a failing pump.
Important Considerations:
* Low fuel: Before suspecting the fuel pump, ensure your gas tank isn't nearly empty. A low fuel level can sometimes mimic fuel pump problems.
* Clogged fuel filter: A clogged fuel filter restricts fuel flow and can cause similar symptoms to a bad fuel pump. Replacing the filter is a relatively inexpensive and easy first step.
* Bad fuel pump relay: This component controls the power to the fuel pump. A faulty relay can prevent the pump from working even if the pump itself is fine. Checking and replacing the relay is a simple and cheap troubleshooting step.
* Other electrical issues: Problems with the ignition system, wiring, or the fuel injectors can also prevent the engine from starting or running smoothly.
How to diagnose:
1. Check fuel level: Make sure your tank isn't almost empty.
2. Listen for the fuel pump: Turn the ignition key to the "on" position (without starting the engine). You should hear a brief whirring sound from the fuel tank area. If you don't hear this sound, the pump or its relay may be faulty.
3. Inspect the fuel filter: Have a mechanic inspect or replace the fuel filter. This is a relatively inexpensive step and could solve the problem.
4. Fuel pressure test: This requires a specialized gauge and is best performed by a mechanic. This test definitively determines if the fuel pump is providing adequate pressure.
In short: While several symptoms point towards a bad fuel pump, it's crucial to rule out other possibilities before replacing it. A fuel pressure test is the most definitive way to diagnose a bad fuel pump. It's advisable to take your 1996 Chrysler Cirrus to a qualified mechanic for proper diagnosis and repair. Replacing a fuel pump can be a labor-intensive job.
