Replacing the fuel pump on a 1995 240SX involves several steps. First, you need to locate the fuel pump, which is under the back seats. Then, you need to remove the four screws from the plate and disconnect the three hoses from the assembly. Next, you need to reach into the fuel tank and remove the old fuel pump by unclipping it. Finally, you can install the new fuel pump by clipping it into place and reconnecting the hoses and screws. There are also fuel pump wiring considerations to keep in mind, and you may need to test the relay with an ohm meter or multimeter.
Characteristics | Values |
---|---|
Location of fuel pump | Under the back seats |
Steps to reach the fuel pump | Remove four screws from the plate, then the three hoses and pull out the assembly |
Steps to remove the fuel pump | Reach inside and pull it out; it's clipped on |
Steps to put the new fuel pump in place | Put it back in with an unclipping action, likely up and to the left |
Location of fuel pump relay | Passenger side fuse box in the engine bay |
Steps to remove the gas tank | Disconnect the fuel lines and the plug for the pump |
What You'll Learn
Removing the fuel pump assembly
To remove the fuel pump assembly from your 1995 240SX, you'll first need to locate the access panel, which is under the rear seats. Remove the four screws holding the panel in place, then disconnect the three hoses and pull out the assembly.
Once the access panel is removed, you'll be able to see inside the fuel tank. The fuel pump is located at the bottom of the tank and is held in place by a clipping mechanism. To remove it, reach into the tank and unclip the fuel pump by lifting it up and towards the driver's side. It should then come free fairly easily.
Be sure to disconnect the fuel lines and the plug for the pump before attempting to remove the fuel pump assembly. There are two straps holding the gas tank in place, so be careful when maneuvering it.
It is also important to ensure that the fuel tank is relatively empty before beginning this process, as a full tank will make it more difficult to access and remove the fuel pump.
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Disconnecting fuel lines and plug
Disconnecting the fuel lines and plug is a crucial step in replacing the fuel pump on a 95 240SX. Here is a detailed guide on how to do it:
First, locate the access panel to the fuel pump and the lines. This can be found under the rear seats of the car. You will see the fuel pump assembly and three hoses connected to it. Remove the four screws securing the plate, and then disconnect the three hoses. Carefully pull out the assembly to expose the inside of the fuel tank.
Next, you will need to disconnect the fuel lines and the plug from the fuel pump. Be very cautious when handling the fuel lines, as they contain flammable fuel. There should be two fuel lines connected to the fuel pump: one for the fuel inlet and one for the fuel outlet. Using appropriate tools, carefully detach these lines from the fuel pump. Make sure to plug or cap the open ends of the fuel lines to prevent any fuel leakage.
After disconnecting the fuel lines, locate the electrical connector or plug for the fuel pump. It should be connected to the fuel pump through the access panel. Disconnect this plug by pushing the tab with a small flat-head screwdriver while gently pulling the plug out. Be careful not to use excessive force, as you may damage the connector.
Once the fuel lines and plug are disconnected, you can now remove the fuel pump from the fuel tank. It is held in place by a clip, so reach into the tank and carefully unclip it. Now you can lift the fuel pump out of the tank.
It is important to work carefully and safely when handling fuel lines and electrical connectors. Always refer to the vehicle's service manual or seek professional assistance if you are unsure about any steps in the process.
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Unclipping the fuel pump
To unclip the fuel pump, you will first need to locate the access panel. This can be found under the rear seats. Once you have found the access panel, you will need to remove the four screws that hold it in place. With the screws removed, you can then lift out the assembly, which will give you a view inside the tank.
At this point, you should be able to see the fuel pump at the bottom of the tank. It is held in place with a clipping mechanism. To remove it, you will need to reach into the tank and carefully unclip the pump. The action required is an up and left movement, towards the driver's side. It should then be fairly easy to remove the pump through the trunk.
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Testing the relay
To test the relay, you can start by checking the resistance between terminal 85 and 86, which should be around .1 ohms. Then, check the resistance between terminal 30 and 87, which should also be about .1 ohms. Ensure that the relay is activated when taking these measurements. If the resistance values are significantly different, the relay may be faulty.
Alternatively, you can test the relay by connecting it to a power source and observing whether it clicks. Connect 12V to Pin #1 and ground to Pin #2. If the relay clicks, it is functioning correctly. If there is no click, the relay is likely faulty.
If you are still unsure, you can test the continuity from pin #2 to the ECU. If there is continuity, the ECU is likely functioning correctly. If there is no continuity, there may be an issue with the ECU or the wiring between the ECU and the relay.
In some cases, you may need to refer to a factory service manual or download a digital copy to help you locate the relay and perform more advanced testing procedures.
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Reattaching the fuel pump
To reattach the fuel pump to your 1995 240SX, you will need to access the fuel pump assembly through the trunk or by removing the rear seats and the access panel.
First, locate the fuel pump assembly and ensure that the fuel tank is low to avoid spillage. Then, reach into the fuel tank and clip the new fuel pump into place. The clipping action is likely an "up and left" movement towards the driver's side.
Next, reconnect the three hoses and secure the assembly with the four screws. Be sure to also reconnect the fuel lines and the plug for the pump. Once everything is securely connected, you can reattach the fuel tank by reconnecting the straps.
Finally, locate the passenger-side fuse box in the engine bay and find the fuel pump relay. Make sure the fuse is in good condition and functional.
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Frequently asked questions
First, remove the four screws from the plate and the three hoses from the assembly. Then, reach inside the tank and pull out the fuel pump.
Disconnect the fuel lines and the plug for the pump.
No, this won't be a problem. Gas has properties so that this doesn't happen (it's a good conductor of electricity, so think about the fuel pump being completely submerged in the fuel tank when it is full).
The passenger side fuse box in the engine bay.