Replacing The Fuel Pump In Your 2004 Infiniti Fx35

If you're experiencing problems with your 2004 Infiniti FX35, you may need to replace the fuel pump. The fuel pump is responsible for delivering fuel from the tank to the fuel injectors, and when it fails to function properly, it can cause a range of issues, from a loss of engine power to the car not starting at all. While it is possible to replace the fuel pump yourself, it is highly recommended that you hire a professional mechanic as the process involves dealing with highly flammable gasoline. The cost of replacing the fuel pump for a 2004 Infiniti FX35 can vary depending on location, but on average, you can expect to pay around $850 for the service, with parts costing around $236 and labor costing around $210.

Park car, locate pump assembly, and check if it's functioning

To replace the fuel pump in your 2004 Infiniti FX35, you'll first need to park your car on a level surface and set the parking brake.

Now, locate the pump assembly in the fuel tank. You or an assistant will need to turn the key to the 'ON' position, and listen at the filler opening. If the fuel pump is functioning, you should hear a hum for 2-3 seconds. If you don't hear this, it's likely that the pump needs to be replaced.

Next, locate and verify the vehicle's fuel pump relay and fuse. If the fuse is damaged, replace it with a new fuse of the same amperage.

Once this is done, check the fuel pump's operation again. If the vehicle's fuel pump is working, the issue is resolved. If it isn't, and the fuse and fuel pump relay are functioning, you'll need to check for power and ground at the fuel pump. If there's power and ground, the old pump is faulty and will need to be replaced.

Drain fuel tank, disconnect battery, and remove pump assembly

Drain fuel tank

Park your 2004 Infiniti FX35 on a level surface and set the parking brake. Drain as much fuel as possible from the fuel tank. Disconnect the filler fuel hose and the electrical connection to the old pump.

Disconnect battery

Relieve the fuel system pressure and disconnect the negative battery cable.

Remove pump assembly

Support the fuel tank using a jack stand and a block of wood. Remove the entire pump assembly, including the pump and the fuel level sending unit, and lower the tank. Remove every hose clamp, disconnect the fuel line or fuel tank hose, and extract the original pump from the gas tank.

Compare old and new pumps, then install new pump

Once the old fuel pump has been removed, it is important to compare the new fuel pump to the old one to ensure that you have the correct part. The new pump should be an exact match for the old one. Check that the new pump has the same number of hose connections and electrical connectors as the old pump. Also, check that the new pump has the same mounting points as the old one. If the new pump is different from the old one, it may not fit properly and could cause issues with fuel flow or electrical connections.

Once you have verified that the new pump is identical to the old one, you can begin the installation process. First, attach any brackets and pick-up screens that can be reused to the new pump. Then, install the new pump by connecting all the fuel lines and electrical connectors. Ensure that all the connections are secure and tight to prevent any leaks. Reinstall the straps and bolts that hold the pump in place. Finally, refill the gas tank and conduct a road test to ensure that the new pump is functioning correctly.

Reinstall bolts and straps, and reconnect electrical connector

Once you have the new fuel pump connected to the fuel lines, you can reinstall the straps and bolts. Ensure that the fuel pump is securely fastened to the fuel tank. Next, reconnect the filler fuel hose and the electrical connector. Finally, reconnect the negative battery cable.

Now, fill the gas tank and conduct a road test to verify the success of the new pump replacement. If the new fuel pump is functioning correctly, the car should run smoothly, with improved fuel efficiency and engine performance.

It is important to note that working with the fuel system can be dangerous, so take all necessary precautions to avoid a fire. If you are not confident in performing this task yourself, it is recommended to seek the help of a professional mechanic.

Fill tank and test for leaks

Once the new fuel pump has been installed, the next step is to fill the tank and test for leaks. This is done by running the engine and taking the car for a road test.

Filling the tank and testing for leaks is the final step in the fuel pump replacement process. Before this, a mechanic will have relieved the fuel system pressure, disconnected the negative battery cable, drained the fuel tank, removed the old pump, installed the new pump, and reinstalled the straps and bolts.

It is important to test for leaks because fuel pump problems can involve leaks of gasoline or vapors, which are unsafe and should be checked by a qualified mechanic.

Frequently asked questions