Ameer Randolph
Replacing a diesel engine fuel pump can be a moderately complicated task, but it is possible to do it yourself if you take your time and follow the instructions for your particular vehicle. The first step is to relieve the fuel system pressure, which can be done by running the engine and pulling the fuel pump relay, or by pressing the Schrader valve on the pressure line. You will then need to locate the fuel tank and remove it from the vehicle, taking care to reduce the amount of fuel in the tank to minimise the risk of spillage.
| Characteristics | Values |
|---|---|
| Difficulty | Moderately complicated |
| Safety | Wear safety glasses and gloves |
| Fuel | Reduce the amount of fuel in the tank |
| Fuel system pressure | Relieve it by running the engine and pulling the fuel pump relay or pressing the Schrader valve on the pressure line |
| Fuel tank | Remove it from the vehicle |
| Pump assembly | Remove it so you can replace it with a new part |
| Parts | Some fuel pumps require parts to be transferred from the old unit |
| Procedure | Reverse it to get the pump installed and the pump retaining ring back in place |
| Tank | Raise it close to the vehicle so you can reconnect the wire connectors and fuel lines |
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What You'll Learn
Relieving fuel system pressure
To relieve fuel system pressure, you can either run the engine and pull the fuel pump relay while the engine is on, or, with the engine off, press the Schrader valve on the pressure line momentarily, capturing the small fuel spray that comes out.
You should always relieve fuel system pressure before removing the fuel tank. This is because most fuel pumps are located directly in the fuel tank, so there is a good chance of spillage or messiness. To reduce the risk of spillage, reduce the amount of fuel in the tank before you start.
Before you start, make sure you are wearing safety glasses and gloves, and that you have given yourself room to work. Have cleanup materials ready to clean any spills immediately.
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Locating the fuel tank
To locate the fuel tank, you will need to relieve the fuel system pressure. You can do this by running the engine, then pulling the fuel pump relay while the engine is on, and the engine will stall. Or, with the engine off, you can press the Schrader valve on the pressure line momentarily, capturing the small fuel spray that comes out.
Once you have relieved the pressure, you will need to locate the fuel tank. The fuel tank is usually located directly in the fuel pump, so you may need to remove the fuel tank to access the pump. Some vehicles have an access panel that will allow you to access the pump without removing the tank, so check for this first.
If you need to remove the fuel tank, you will need to reduce the amount of fuel in the tank to avoid spillage. Then, raise the tank close to the vehicle so you can reconnect the wire connectors and fuel lines.
Remember to always put safety first when working on your vehicle. Wear safety glasses and gloves, and give yourself room to work. Have cleanup materials ready to clean any spills immediately.
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Reducing the amount of fuel in the tank
Before replacing a diesel engine fuel pump, it is important to reduce the amount of fuel in the tank. This is because most fuel pumps are located directly in the fuel tank, so there is a high chance of spillage or messiness. Reducing the amount of fuel in the tank will help to minimise this risk.
To reduce the amount of fuel in the tank, you can try running the engine until it stalls. This will relieve the fuel system pressure and use up some of the fuel. Alternatively, with the engine off, you can press the Schrader valve on the pressure line momentarily, capturing the small fuel spray that comes out.
If your vehicle has an access panel, you may be able to access the pump without removing the tank. However, if no access panel exists, you will need to remove the fuel tank to access the pump. In this case, it is especially important to reduce the amount of fuel in the tank to avoid spillage.
Once you have reduced the fuel level, you can begin the process of replacing the fuel pump. This involves removing the pump assembly and transferring any necessary parts from the old unit to the new one. Remember to take your time and follow the instructions specific to your vehicle.
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Removing the pump assembly
Before removing the pump assembly, you should relieve the fuel system pressure. You can do this by running the engine, then pulling the fuel pump relay while the engine is on, and the engine will stall. Or, with the engine off, you can press the Schrader valve on the pressure line momentarily, capturing the small fuel spray that comes out.
Next, you will need to locate the fuel tank and remove it from the vehicle. If there’s gas in the tank, you’ll have to drain it into an approved container first. It's important to clean the tank thoroughly during the repair. Then, remove the clamps from the fill lines and then remove the fill lines as you prepare to drop the gas tank. You can use a rag to avoid getting dirt in the tank. Make sure to support the tank as you remove the straps and carefully lower the gas tank.
Now, you can remove the pump assembly so you can replace it with a new part. Keep in mind that some fuel pumps require parts to be transferred from the old unit. Once you remove the lock ring, you can pull off the top part, which is attached with wires to the bottom two parts.
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Reconnecting wire connectors and fuel lines
Once you have installed the new pump and put the pump retaining ring back in place, raise the tank close to the vehicle. You can then reconnect the wire connectors and fuel lines.
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Frequently asked questions
Replacing a fuel pump can be dangerous, as you are working with flammable liquid, so take your time and follow the instructions for your particular vehicle. First, relieve the fuel system pressure, either by running the engine and pulling the fuel pump relay, or by pressing the Schrader valve on the pressure line with the engine off. Next, locate the fuel tank and remove it from the vehicle. Then, remove the pump assembly and replace it with a new part, making sure to transfer any necessary parts from the old unit. Finally, reverse the procedure to get the pump installed and the pump retaining ring back in place, before reconnecting the wire connectors and fuel lines.
In some cases, yes. If there is no access panel in the passenger compartment, you will need to remove the fuel tank to access the pump.
With the engine running, pull the fuel pump relay and the engine will stall. Alternatively, with the engine off, press the Schrader valve on the pressure line momentarily, capturing the small fuel spray that comes out.
