Replacing Fuel Pump In Mazda Tribute: Step-By-Step Guide

The fuel pump in a Mazda Tribute is responsible for delivering gas from the fuel tank to the fuel injectors. While there is no specific replacement interval, fuel pumps can fail for a variety of reasons, and replacement becomes more common as the car's mileage increases. Symptoms of a failing fuel pump include a sudden loss of fuel economy, uneven acceleration and jolting, and a failure to start the engine. If you suspect your Mazda Tribute's fuel pump needs to be replaced, it is recommended to have it inspected and serviced by a qualified mechanic due to the risk of fire when working with the fuel system. The cost of replacing a fuel pump can vary depending on your location, but typically ranges from $920 to $1,727.

Disconnect the battery

Disconnecting the battery is the first step in replacing the fuel pump on a Mazda Tribute. This is a crucial safety precaution to reduce the chance of a fire occurring during the procedure.

Before beginning any work on the fuel pump, it is essential to disconnect the battery. This will ensure that there is no power flowing to the vehicle's electrical system, minimising the risk of sparks or electrical shorts that could potentially ignite fuel vapours.

To disconnect the battery, locate the negative terminal, which is usually marked with a "-" symbol or a black cover. Loosen the nut or clamp that secures the negative battery cable to the terminal, using an appropriate-sized wrench or socket. Once loose, carefully remove the cable from the terminal. You may need to wiggle the cable slightly to detach it. Be cautious not to let the cable touch any metal parts of the car, as this could cause a short circuit.

After the negative cable is disconnected, also disconnect the positive cable, which is usually marked with a "+" symbol or a red cover. Again, loosen the nut or clamp securing the cable and remove it from the terminal. With both cables now disconnected, the battery is safely isolated from the electrical system.

It is good practice to tape or cover the disconnected battery terminals to prevent accidental contact with any metal tools or components during the fuel pump replacement procedure. Ensure that the cables do not dangle or touch any metal surfaces.

Remove the access cover

To remove the access cover of your Mazda Tribute, you will first need to disconnect the battery to reduce the chance of a fire. This is an important safety precaution when working with the fuel system.

Next, locate the access cover. If your fuel pump is inside the fuel tank, there will usually be an access cover that needs to be removed. This is typically found above the tank in the passenger compartment. With the cover located, you can then proceed to remove it.

In some cases, you will need to drain the fuel before removing the access panel. This is an important step to prevent spillage and ensure your safety. Once the cover is off, you will be able to access the fuel pump for replacement.

Replace the pump and pre-pump filter screen

To replace the fuel pump and pre-pump filter screen of a Mazda Tribute, you will need to follow these steps:

Step 1: Disconnect the battery

Before beginning any work on the fuel pump, it is important to disconnect the battery to reduce the risk of fire. This is a crucial safety precaution.

Step 2: Gain access to the fuel pump

If the fuel pump is located inside the fuel tank, you will need to remove an access cover to reach it. In some cases, you may need to drain the fuel before removing this access panel. If the pump is located outside the tank, proceed to the next step.

Step 3: Remove the old fuel pump

Disconnect the fuel lines, EVAP system hoses, and electrical connections to the pump. Carefully remove the old fuel pump from the fuel tank. Take note of the pump's orientation and any brackets or mounting hardware that need to be transferred to the new pump.

Step 4: Install the new fuel pump and filter screen

Before installing the new fuel pump, inspect and clean any reusable brackets or pick-up screens. Attach these components to the new pump, ensuring they are secure. Carefully insert the new pump into the fuel tank, making sure it is properly aligned and secured in place.

Step 5: Re-establish connections

Reconnect the fuel pump supply and return hoses, EVAP system hoses, and electrical connections. Ensure that all connections are tight and secure to prevent leaks.

Step 6: Refill the fuel tank and test

Refill the fuel tank and start the engine. Observe the fuel pump for any signs of leaks. Ensure that the engine runs smoothly and that there are no unusual noises coming from the fuel pump.

It is important to note that working with the fuel system can be dangerous, and it is recommended that these repairs be handled by a professional mechanic unless you have significant experience in auto repair. Always take the necessary precautions to prevent fires and handle flammable liquids safely.

Check for fuel leaks

After replacing the fuel pump, it is important to check for fuel leaks. Fuel leaks can be dangerous and can lead to fires, so it is important to take the necessary precautions. Here are some detailed instructions on how to check for fuel leaks:

Before starting the engine, perform a thorough visual inspection of the fuel pump and the surrounding area. Look for any signs of fuel leakage, such as wet spots, drips, or puddles. Pay close attention to the connections, hoses, and fittings. Make sure that all components are securely connected and there are no signs of damage or deterioration.

Once you have completed the visual inspection, start the engine and let it run for a few minutes. With the engine running, carefully inspect the fuel pump and fuel lines again. Listen for any unusual noises, such as hissing or spraying sounds, which could indicate a leak. If you notice any strong gasoline odours or see any vapours, it may be a sign of a leak.

If you have access to a vehicle lift, raise the vehicle and inspect the underside for any signs of fuel leakage. Fuel leaks can occur at various points along the fuel lines or connections, so it is important to check the entire fuel system thoroughly. Make sure to wear appropriate personal protective equipment, including gloves and eye protection, when inspecting for leaks.

If you suspect a fuel leak, it is important to address it immediately. Do not ignore a potential leak, as it can pose a serious safety hazard. Contact a qualified mechanic or seek professional assistance to identify and repair the leak. Do not attempt to drive the vehicle if you suspect a fuel leak, as it could lead to a dangerous situation.

To prevent fuel leaks and ensure the proper functioning of your Mazda Tribute's fuel pump, regular maintenance and inspections are crucial. Follow the recommended service intervals and keep an eye on the fuel system for any signs of wear or damage. By being proactive and taking preventive measures, you can help ensure the safety and reliability of your vehicle.

Test the engine

Once you've replaced the fuel pump in your Mazda Tribute, you'll want to test the engine to make sure everything is working as it should be. Here's a step-by-step guide on how to do that:

Check the Vacuum:

Start by attaching a T-connector to the vacuum pump. Remove the Miller Cycle Engine Cover and the right-side intercooler plastic intake part to access the Fuel Pressure Regulator. Remove the small clamp and vacuum hose. Connect the T-connector to the Fuel Pressure Regulator and the vacuum hose. Ensure the hoses are short for accurate readings. Start the car and let it idle. You should get a reading of at least 18 psi (450 mmHg). If it's below this, you may have a vacuum leak in the vacuum hose or air-intake system.

Fuel Line Pressure Test:

For this test, you'll need a fuel pressure gauge. Connect the gauge as follows: use an aluminium T-connector, screw in a brass fitting at the top, and attach the vacuum gauge. Connect the larger diameter hose to one side of the T-connector and position the two small hose clamps, tightening one for the T-connector and leaving the other loose for the fuel filter. Pull the hose from the backside of the fuel filter and connect the T-connector to the car's fuel hose, then connect the short hose from the gauge to the end of the fuel filter. With the setup complete, turn the ignition to the 'on' position without starting the car. The fuel pump should be running, and you should get a reading of 40 psi or greater.

Fuel Pressure Hold Test:

After completing the fuel line pressure test, remove the jumper and wait five minutes. The fuel pressure should hold at 21 psi or greater.

Running Engine Test:

Now, start the engine and let it idle. With the engine running, check the fuel pressure again. You should get a reading between 30 and 48 psi.

Pressure Regulator Test:

With the engine still running, pull the vacuum hose from the Pressure Regulator. The fuel pressure should jump by about 5 to 10 psi, reading between 41 and 48 psi. If it doesn't jump, the pressure regulator may need to be replaced.

Final Checks:

If all the tests are within the specified ranges, your new fuel pump is functioning correctly. If there are issues, further checks may be required, such as checking for clogged lines, a clogged fuel filter, fuel leaks, or electrical problems. It is recommended that you replace the fuel filter and consider replacing the fuel pump relay if your vehicle has a history of relay failures.

Please note that working with the fuel system can be dangerous, so always take fire precautions and be vigilant for fuel leaks or odours. If you notice any issues, do not start or drive the car, and have it towed to a repair shop.

Frequently asked questions