Replacing The Fuel Pump In Your Ford: Step-By-Step Guide

If you're experiencing a sudden drop in fuel economy, it might be time to change the fuel pump on your Ford F350. Luckily, there are plenty of online resources to help you do this, including step-by-step guides and video tutorials on YouTube. You can also buy Ford F350 fuel pumps from online retailers such as Advance Auto Parts, which offers a range of pumps with prices starting from $19.99. Before you begin, it's important to investigate which fuel pump system your truck uses, as some trucks have multiple pumps.

Disconnect the fuel line and check if fuel is coming through

Disconnecting the fuel line and checking for fuel flow is a crucial step in diagnosing and resolving fuel pump issues in your Ford F350. Here's a detailed guide on how to approach this task:

Step 1: Locate the Fuel Line

Start by identifying the fuel line, which is the hose that carries fuel from the tank to the engine. It is usually made of rubber or metal tubing and can be found near the fuel tank or engine compartment.

Step 2: Disconnect the Fuel Line

Before you begin, place a container or rag underneath the fuel line to catch any spilled fuel. Then, using the appropriate tool (such as a wrench or pliers), carefully loosen and detach the fuel line from its connection point. Be cautious to avoid any sharp edges that could damage the fuel line.

Step 3: Check for Fuel Flow

With the fuel line disconnected, you can now check for fuel flow. Turn the ignition key to the "On" position, but do not start the engine. Look into the disconnected end of the fuel line or the container/rag you placed underneath to observe if fuel is coming through.

Step 4: Analyze the Results

If you see a steady stream of fuel flowing through the line, this indicates that the fuel pump is likely functioning properly, and the issue may lie elsewhere in the fuel system. However, if there is no fuel flow or only a small amount, it suggests that the fuel pump may be faulty or clogged.

Step 5: Further Troubleshooting

If you suspect a problem with the fuel pump, the next step would typically involve checking the fuel pump pressure. This usually requires specialized tools, such as a fuel pressure gauge, and may be more comfortably performed by a mechanic. They can help diagnose the issue and recommend the necessary repairs or replacements.

Remember to exercise caution when working with fuel lines and always work in a well-ventilated area to prevent the buildup of flammable fumes.

Check the tank selector switch

To check the tank selector switch on a Ford F-350, you will need to perform a few tests with a test light or a voltmeter. Here is a step-by-step guide:

• Locate the Fuel Tank Selector Switch: The fuel tank selector switch is typically located in the dash of your Ford F-350. It allows you to select between the front and rear fuel tanks.
• Perform Initial Checks: With the ignition turned off, set the selector switch to the front tank position. Locate the red wire that leads to the front fuel pump. Connect your test light to this wire, and then turn the ignition to the "KOEO" (Key On, Engine Off) position. If the test light illuminates, it indicates that power is reaching the front fuel pump as expected.
• Test the Front Tank Circuit: Now, with the selector switch still on the front tank, locate the dark brown/yellow wire leading to/from the front fuel pump. Connect your test light to this wire and repeat the KOEO test. If the test light does not illuminate, it suggests an issue with the wiring or the selector switch.
• Repeat for the Rear Tank: For the rear tank, you will need to locate the yellow/white wire associated with the rear fuel pump. Connect the test light to this wire and perform the KOEO test with the selector switch set to the rear tank. Observe whether the test light illuminates.
• Interpreting the Results: If both the front and rear tank circuits show power when performing the KOEO test, it is likely that your selector switch is functioning correctly. However, if there is no power on either circuit, or if only one circuit illuminates the test light, then you may have a faulty selector switch or a problem with the wiring.
• Using a Voltmeter (Optional): For more comprehensive testing, consider using a voltmeter to check the voltage on each wire. This will provide a more precise indication of whether the circuits are functioning correctly.

It is important to note that this guide is based on information from online forums and may not be applicable to all Ford F-350 models. Always refer to your vehicle's specific repair manual or consult a qualified mechanic for accurate instructions on checking the tank selector switch.

Check the fuel filter

Checking the fuel filter on your Ford F-350 is a straightforward process and can help you identify if it needs to be replaced. A clogged fuel filter can reduce the amount of fuel taken into the engine, leading to poor performance and difficulty starting the vehicle.

First, locate the fuel filter. In the Ford E350, it is inside the frame rail directly below the driver's side door. Place a drainage pan below the fuel filter to catch any excess fuel that may leak from the fuel line during the process.

Next, use a small flathead screwdriver to gently pry open the release tab located on the retaining clamp that secures the fuel line to the fuel filter. You will need to do this for both clamps on each end of the fuel filter. After this, remove the screw from the filter clamp securing the casing of the filter to the frame rail, also with a flathead screwdriver.

Now you can slide the fuel filter out of the clamp and observe its condition. If the filter is dirty or clogged, it will need to be replaced. The filter should be replaced with a new one, ensuring the arrow on the end of the new filter is facing the front of the engine.

Finally, tighten the filter casing to the frame rail by screwing in the flathead screw, and slide the fuel lines back onto each end of the filter. Lock the lines in place by pushing down on the locking tab.

Check the fuel strainer

The fuel pump strainer is an oblong filter made of fine mesh material. It is fitted over the fuel pick-up tube at the bottom of the fuel pump, which is inside the fuel tank. The fuel pump strainer keeps contaminants out of the fuel pump and protects the pump by trapping impurities such as gasoline deposits and varnish before the fuel enters the pump.

To check the fuel strainer, start by locating the fuel pump in your Ford 350. The fuel pump is located inside the fuel tank. Once you have located the fuel pump, you can find the fuel strainer attached to the bottom of the pump.

Next, you will need to remove the strainer from the pump. Be sure to have a container ready to catch any fuel that may spill out. Inspect the strainer for any debris, dirt, or clogging. If the strainer looks dirty or clogged, it will need to be replaced.

A clogged fuel strainer can restrict the flow of fuel to the pump and lead to fuel pump failure. If the strainer looks clear and clean, reattach it to the fuel pump and reassemble the fuel tank.

It is important to note that the fuel pump strainer is typically replaced when the fuel pump itself is replaced. The strainer is an integral part of the fuel pump assembly, and a new fuel pump will come with a new strainer.

Check the fuel tank for debris and cleanliness

To check the fuel tank for debris and cleanliness, start by locating the tank in a clear area away from safety hazards. If your tank is in a static position, ensure it is adequately grounded (electrically earthed) before performing an operational test.

Next, remove any water and debris from the tank. This can be done by visually inspecting the tank for leaks and keeping the surrounding area clear of debris and vegetation to easily identify any drips or spills. Check for water or product in the interstitial space (containment area) and remove any accumulation of rainwater, diesel, or other liquids. A trained person with appropriate PPE should perform this task, disposing of any waste as hazardous material following local regulations.

Additionally, check the fuel levels and quality. Poor-quality fuel can damage the tank and equipment. Signs of poor fuel include a change in color (cloudiness), an unpleasant odor, equipment running differently (e.g., spluttering), and a build-up of sediment or sludge in the tank, filters, or pumps. Running on a near-dry tank can lead to sediment formation, which will block pumps and damage equipment.

Inspect the fuel tank for any signs of corrosion or damage. Fuel tanks should be constructed of non-corrosive materials or coated with a corrosion-resistant layer to protect against water, alcohol, and salt damage. If corrosion or damage is present, the tank should be replaced with the original manufacturer's equipment.

Finally, inspect the fuel filter for any debris or deposits. This can be done by disconnecting the fuel line from the carburetor and disposing of the fuel safely. Once the tank is empty, use a flashlight to check for debris and beads of light that indicate holes or cracks. Use a baster to remove loose debris. If damage is found, replace the tank with the original manufacturer's equipment.

Frequently asked questions