Fuel Pump Pressure: 2001 Plymouth Neon's Optimum Range

The fuel pump in a 2001 Plymouth Neon is located within a special module mounted inside the fuel tank. This means that to change the fuel pump, you will need to remove the fuel tank. The fuel pump can be tested with a fuel pressure test gauge, which can be purchased online or at an auto parts store. The correct fuel pressure specification for a 2001 Plymouth Neon is 48 PSI with the key on and engine off and the fuel pump activated.

Fuel pump location

The fuel pump on a 2001 Plymouth Neon is located within a special module mounted inside the fuel tank. This means that to access the pump, you will need to remove the fuel tank. While it is possible to replace the individual components of the module, it is recommended to change the entire module as a whole.

The process of replacing the fuel pump is not straightforward, and it is recommended that amateurs avoid this task. To replace the module, you will need to disconnect the terminals on the electrical connectors. This involves removing the fuel sending unit and transferring it to a new pump.

Before replacing the fuel pump, you will need to drain the fuel tank. It is also worth considering replacing the fuel tank straps at the same time, as you will already have the tank removed.

Overall, replacing the fuel pump on a 2001 Plymouth Neon is a complex task that may be best left to a professional.

Fuel pump replacement

Step 1: Check if your fuel pump needs to be replaced

Park your vehicle on level ground and engage the parking brake. Locate the fuel pump—on most vehicles, it's inside the fuel tank. Open the fuel cap and turn the key to the "ON" position. If you don't hear a hum for two to three seconds, your fuel pump may need replacing.

Step 2: Find and verify the fuel pump fuse and relay

Check the fuse and relay for the fuel pump. If the fuse is blown, replace it with one of the same amperage. If the fuse and relay are functional, check for power and ground at the fuel pump. If there is power and ground at the pump, then the pump is faulty and needs to be replaced.

Step 3: Prepare for the fuel pump replacement

Relieve the fuel system pressure and disconnect the negative battery cable. Siphon or drain as much fuel as possible from the tank. Disconnect the filler tube hose and electrical connection to the pump.

Step 4: Remove the fuel tank

Support the fuel tank with a jack and a block of wood. Remove any retaining straps or bolts holding the tank to the frame, then carefully lower the tank.

Step 5: Remove and replace the fuel pump

Disconnect the fuel lines and remove the fuel pump from the tank. Compare the new fuel pump with the old one to ensure you have the correct part. Install the new fuel pump, then connect the fuel lines to the new pump.

Step 6: Reinstall the fuel tank and test

Lift the fuel tank and reinstall the retaining strap. Reconnect the filler tube hose and electrical connector. Reconnect the negative battery cable and fill the tank with gas. Conduct a road test to confirm the repair was successful.

Additional Notes:

The process of replacing a fuel pump can be dangerous as fuel is flammable. It is recommended to have an assistant to facilitate the process. Additionally, make sure to take the necessary precautions and have a fire extinguisher on hand.

For older vehicles, don't forget to replace the fuel filter as well. Modern, return-less fuel systems have the filter integrated into the assembly, which usually comes with the new pump.

Finally, the cost of fuel pump replacement can vary. The part itself can cost hundreds of dollars, and labor costs can be high if the fuel tank must be dropped to access the pump.

Fuel pump failure symptoms

A fuel pump plays a crucial role in making your car move, so it's important to be aware of the warning signs of a failing fuel pump. Here are some common symptoms of a failing fuel pump:

• The car won't start: If your vehicle is struggling to start or isn't starting at all, it could be due to a damaged or clogged fuel pump. This may be indicated by the car requiring more than the average number of cranks to turn over.
• The car sputters or dies while driving: If your engine is stalling or sputtering during your drive, it's likely that the low pressure caused by a faulty fuel pump is to blame. This issue may be more noticeable when accelerating or driving uphill.
• The engine surges: A surging engine, characterised by repeated speed increases and decreases without any input from the driver, can be a sign of a bad fuel pump. This occurs when too much fuel is sent to the engine.
• Whining noise from the fuel tank: If you hear a low-grade whining or whirring noise coming from your fuel tank, it could indicate a problem with the fuel pump. Typically, a healthy fuel pump will make a low, barely noticeable humming sound.
• Lower gas mileage: A damaged or worn fuel pump can allow excess fuel to enter the engine, resulting in reduced fuel efficiency and more frequent trips to the gas station.

It's important to note that these symptoms could also be caused by other issues, such as bad fuel, damaged fuel lines, or a clogged fuel filter. Therefore, it's recommended to have a comprehensive inspection and diagnosis performed by a qualified technician to accurately identify the root cause of the problem.

Fuel pump testing

Testing your fuel pump is a relatively simple process that can be done at home, but it is important to take the proper precautions and follow the correct steps to ensure an accurate reading. Here is a step-by-step guide on how to test your fuel pump for pressure, volume, and electrical integrity.

Step 1: Safety First

Before performing any diagnostic tests, it is crucial to prioritize safety. Releasing fuel under pressure can cause fires and injuries, so it is important to wear safety gear such as gloves and safety glasses. Work in a well-ventilated area, and avoid smoking or having anything nearby that could create a spark.

Step 2: Check Fuel Pressure

Start by checking the fuel pressure. Begin with the car idling and install a fuel pressure gauge. Run the pump and note the pressure reading, then compare it to the manufacturer's specifications. If the pressure is low, address this issue first. If the fuel pump is supplying sufficient pressure, proceed to the next step.

Step 3: Fuel Volume Test

For this step, you will need a flowmeter or a glass measuring container. The most accurate way to test fuel delivery is by using a flowmeter, but if you don't have access to one, you can perform a timed fuel delivery test using a glass container. Start the car and collect a fuel sample for five seconds with the pump running. Check your manufacturer's specifications to see if your pump is delivering the right amount of fuel within the specified timeframe.

Step 4: Electrical Test

Check the fuel pump fuse in your owner's manual. Locate the fuse box and identify the fuse that corresponds to the fuel pump. Inspect the fuse for signs of failure, such as a blown or burned fuse. If the fuse looks good, check the rest of the fuses related to the fuel system and replace any blown fuses if necessary. If no fuses are blown, listen for the fuel pump relay clicking on while someone turns the key.

Step 5: Check Voltage at the Pump

Just because there is power to the circuit doesn't mean it is reaching the pump. Consult your vehicle's service manual to find out where and how to check the voltage at the pump. Test for source voltage to determine if the charge is reaching the pump. If no power is getting to the fuel pump, check the fuel pump relay circuit as you may have a bad relay.

Step 6: Perform a Drop Test with a Voltmeter

Use a voltmeter to check the power wire and grounding wire. If there is more than a one-volt difference, you likely have an issue with corroded wires or a problem with the circuit on the positive or negative side. Take your car to a shop for further testing and advice.

Step 7: Fuel Pressure Test

Purchase a fuel pressure gauge from an auto parts store or borrow one from a machine or auto shop. Locate the fuel pump test point, usually near the fuel injectors, and attach the pressure gauge to the test fitting or port. Start the engine and check the pressure at idle speed and the rated speed listed in your pump specifications. If the pressure does not match the specifications, your fuel pump and filter may need to be replaced.

Fuel pump whining

If you're hearing a whining noise from your 2001 Plymouth Neon's fuel tank, it's likely that the fuel pump is wearing out and needs to be replaced. The fuel pump is located inside the fuel tank, so to replace it, you'll need to remove the fuel tank and replace the entire pump module. This is a complex job that involves disconnecting electrical connectors, so it's recommended that amateurs avoid attempting it.

The whining noise could also be caused by a stuck pump. A temporary workaround for this is to bang on the bottom of the fuel tank with the ignition switch on.

Frequently asked questions