Replacing The Fuel Tank Float In Your F350 Diesel

The fuel tank float in your F350 diesel is part of the fuel tank sending unit, which is responsible for reading the fuel level in your vehicle. A faulty float can cause the fuel gauge to read incorrectly, so it's important to know how to change it. The process involves removing the fuel tank, disconnecting the old sending unit, and installing a new one. You can find replacement sending units online or at auto parts stores, but make sure to get the correct part for your specific F350 model. The repair can be done at home with the right tools and safety precautions, but it's recommended to have a professional technician do it if you're not comfortable with the procedure.

Fuel tank float replacement parts are available online

If you're looking to replace the fuel tank float in your F350 diesel, you can find the parts you need online. A faulty fuel tank float can cause issues with the fuel gauge, so it's important to address the problem promptly.

Several online retailers, such as Amazon, Summit Racing, and O'Reilly Auto Parts, offer fuel tank gauge floats that are compatible with various vehicle models. These replacement floats are designed to be easy to install and resistant to alcohol and gasoline. They are also priced affordably, usually costing under $20 for a set of two.

In addition to the float, you may also need to replace the sending unit, which includes the fuel pump and other components. Online retailers like AutoZone offer a range of sending units and fuel pumps specifically for the Ford F350. When purchasing these parts, be sure to verify compatibility with your specific F350 model.

It is recommended to consult a repair manual or seek advice from a qualified technician if you are unsure about the replacement process or encounter any difficulties.

The average cost of a Ford F-350 Super Duty Fuel Tank Replacement is between $2,682 and $2,808

The fuel tank in your Ford F-350 Super Duty is responsible for storing engine fuel and is mounted to the bottom rear of your vehicle. It is part of the evaporative emissions control system and the fuel delivery system. The fuel tank is filled with fuel through the fill spout, which connects to the fuel tank filler neck. The filler neck is equipped with a check valve or release valve, which allows fuel to enter the tank and replace the air inside. When the tank is full, the pressure signals the fuel pump to stop sending fuel.

The average cost for a Ford F-350 Super Duty Fuel Tank Replacement is between $2,682 and $2,808. Labor costs are estimated between $239 and $301, while parts are priced between $2,443 and $2,507. This range does not include taxes and fees and does not factor in your unique location. Related repairs may also be needed, so the final cost could be higher.

It is important to note that fuel tanks are large, cumbersome, and heavy. While a DIYer can handle the repair with an assistant, it is essential to have proper working knowledge of safety procedures, electricity, and fuel. If you feel unqualified, it is best to leave it to a professional technician.

Some symptoms of a bad fuel tank include the check engine light illuminating, a popping sound accompanying the check engine light, difficulty starting the engine, a rough idle, and poor fuel mileage. In some cases, the exterior of the fuel tank may not show any damage, but the inside could be rusted or corroded, with rust flakes or debris floating in the fuel.

If you are experiencing issues with your fuel gauge, there could be a problem with the dual fuel tanks, the sending units, floats, or the selector valve. It is recommended to have the sending units tested and, if necessary, replaced. You can also try manually manipulating the floats and checking the selector valve.

For a more accurate estimate of the cost of replacing your Ford F-350 Super Duty fuel tank, you can use an online Fair Price Estimator that factors in your unique location.

Fuel tank failure rates vary with the age of the vehicle and environmental differences

For example, let's consider the Ford F350, a popular diesel truck. Some owners of older Ford F350 trucks have reported issues with their dual fuel tanks. In one case, the front tank was reading empty, which was suspected to be due to a leaky float. After replacing the sending units and floats, the issue persisted. The problem was eventually traced to the fuel selector valve, which is responsible for switching between the two tanks and relaying the fuel level.

To prevent fuel tank issues, it is recommended to avoid overfilling or topping off the tank. When the tank is overfilled, the charcoal canister can fill with fuel, leading to degradation and system failure. Additionally, regular maintenance and inspections are crucial to identify potential issues before they become safety hazards.

In newer vehicles, the introduction of High-Pressure Common Rail (HPCR) fuel systems has made them more susceptible to damage from contaminated fuel. Dirty fuel can contain hard particulate matter, such as rust, corrosion, and other contaminants, which can cause problems with the fuel injectors and pump performance. Therefore, it is essential to ensure that the fuel is clean and free of contaminants to prevent premature failure in newer equipment.

In summary, fuel tank failure rates are influenced by both the age of the vehicle and environmental factors. Older vehicles with metal tanks are more prone to corrosion, especially in certain environmental conditions. Regular maintenance and inspections can help identify and prevent issues. Additionally, ensuring clean fuel and proper handling practices are crucial, especially in newer vehicles with HPCR fuel systems.

Fuel tank issues can be diagnosed by checking the EVAP system

The evaporative emissions control system (EVAP) is designed to prevent fuel vapours from escaping into the atmosphere from your gasoline tank. Fuel vapours are composed of hydrocarbon molecules (HC) which, when exposed to sunlight and oxides of nitrogen (NOx), result in photochemical smog. This smog is the brown hazy stuff that nobody wants to see in the sky. These compounds are also known to cause eye irritation and respiratory problems. That’s why hydrocarbon control and reduction are a major component of your car’s emissions control strategy.

The EVAP system is monitored by the vehicle's on-board diagnostic system, which triggers a malfunction indicator light (MIL) to alert the driver of any issues. When the EVAP system is checked, the purge valve and vent valve are closed, and the pressure is monitored by the fuel tank pressure sensor. If that pressure drops with both valves closed, there is a leak in the EVAP system. If pressure holds properly, the system passes, and will continue to prevent vapour emissions. The sensor is also used in testing vent valve and purge valve operation. When the valves are open, the pressure sensor reads the fuel tank pressure, and must sense a drop in pressure. If not, the purge valve or vent valve may be faulty.

There are some symptoms to determine a malfunction in the EVAP system:

• A strong smell of gasoline around the vehicle can be an indication of an EVAP system failure.
• An EVAP system failure can cause decreased fuel efficiency, engine performance issues, and damage to the environment.
• When the EVAP system is not functioning properly, it can cause the engine to start hard or run rough. The reason behind this issue is often a malfunctioning purge valve that regulates the flow of fuel vapours to the engine.
• The EVAP system plays a crucial role in reducing harmful emissions from the vehicle, which can also affect the vehicle's fuel economy. When the EVAP system is not working correctly, it can cause the engine to run less efficiently, which can lead to reduced fuel economy over time.
• If the EVAP system is not functioning properly, it can result in higher emissions from the vehicle, which can cause the vehicle to fail an emissions test.

Detecting an EVAP leak in a vehicle involves a few steps and tools, mainly because these leaks can be small and not directly observable. Here are some of the common methods to detect EVAP leaks:

• Conduct a visual inspection: Closely examine all accessible parts of the EVAP system, including hoses, valves, and connections. Check for any cracks, holes, or signs of brittleness, especially in the rubber hoses that can degrade over time. Ensure that all connections are secure and that no components are visibly damaged or disconnected, particularly around areas like the fuel tank, purge valve, and charcoal canister.
• Evaluate the gas cap: The gas cap is a frequent culprit in EVAP system leaks. Ensure that the cap is not only tightened properly but also in good condition. Look for any cracks or a deteriorated rubber seal, which can compromise the cap's ability to maintain a proper seal.
• Use a smoke test: A professional-grade smoke test involves injecting smoke combined with a dye into the EVAP system while it is sealed. The smoke will seep out through any leaks, making them visible as wisps of smoke. For a more thorough examination, some mechanics might use UV smoke that glows under a black light, highlighting even the smallest leaks.
• Use an OBD II scanner: An OBD II scanner is a diagnostic tool that interfaces with the vehicle’s onboard computer. When connected, it can retrieve diagnostic trouble codes (DTCs) that indicate specific issues, including those related to the EVAP system. Codes like P0442 or P0456 directly suggest small leaks. The scanner can also initiate a system test to further diagnose the severity and location of the leak.
• Apply a pressure and vacuum test: This method uses specialised equipment to apply a specific pressure or vacuum to the EVAP system, then monitors it to see if the system holds the pressure or vacuum without dropping. A drop in pressure or vacuum indicates a leak. This test can be precise in determining the integrity of the system and can help verify that a repair was successful.

Fuel tank problems can be avoided by not overfilling or topping off the tank

Fuel tank problems in your Ford F350 can be avoided by not overfilling or topping off the tank. Overfilling your gas tank can cause serious damage to your vehicle's emissions system, which includes the charcoal canister, purge valves, and solenoids. This can lead to costly repairs and even cause your vehicle to fail emissions testing. By simply avoiding overfilling your tank, you can prevent these issues and keep your vehicle running smoothly.

Now, let's discuss the process of changing the fuel tank float in your F350 diesel engine:

Step 1: Understanding the Issue

Before you begin, it's important to correctly diagnose the problem. In your case, you mentioned issues with the dual fuel tanks, where the front tank read empty and the rear tank read about a quarter full. This could be due to a faulty fuel tank float or a faulty fuel gauge.

Step 2: Accessing the Fuel Tank

Refer to your vehicle's repair manual to locate and access the fuel tank. The process may vary depending on your specific F350 model. Make sure to take the necessary safety precautions when working with fuel, such as disconnecting the battery and following fire safety guidelines.

Step 3: Inspecting and Replacing the Fuel Tank Float

Once you have accessed the fuel tank, you will need to inspect the fuel tank float. The float is responsible for indicating the fuel level in the tank. If it is damaged or malfunctioning, you will need to replace it. Carefully remove the old float and install a new one, ensuring it is secure and functioning properly.

Step 4: Testing and Verification

After replacing the fuel tank float, reconnect the fuel tank and start the engine. Observe the fuel gauge to see if it is now reading the correct fuel level. If the issue persists, you may need to consult a professional mechanic or consider other potential causes, such as a faulty fuel gauge or fuel sender unit.

Step 5: Preventative Measures

To prevent future issues with your fuel tank, follow the recommendations provided by RepairPal: avoid overfilling or topping off the fuel tank. This will help prevent problems with the EVAP system, especially the charcoal canister, which can degrade and fail if filled with fuel.

Additionally, consider the following advice:

• Regularly inspect and maintain your fuel tank and its components.
• Keep your vehicle in a suitable environment to prevent extreme temperature fluctuations, high humidity, and exposure to salt or deep water, as these conditions can accelerate corrosion.
• If you notice any signs of corrosion or damage to the fuel tank or related components, have them inspected and replaced by a qualified technician as soon as possible.

Frequently asked questions