Ameer Randolph
The Ford F-150 is a popular truck model that has been in production since 1975. While the vehicle has undergone various design changes over the years, some owners of the 1983 model have reported issues with their fuel systems, particularly those with dual tanks. Common problems include fuel gauge malfunctions, fuel transfer between tanks, and challenges with refuelling and engine performance. To address these issues, owners may need to separate or replace fuel tank lines, which can be a complex task due to the age of the vehicle and variations in fuel system designs.
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What You'll Learn
Fuel gauge issues
The 1983 F150 is a classic Ford truck. If you are experiencing issues with your fuel gauge, there are a few things you can check.
Firstly, ensure that the gauge is receiving power. Check the wiring and the selector valve on the frame to ensure they are functioning correctly. If the gauge is not receiving power, there may be an issue with the ground wire or the sending units. Check the ground wire connection and verify that the sending units are clean and functioning properly.
If your fuel gauge issue is accompanied by the engine cutting out, especially when using the rear tank, there may be a problem with the fuel line. Inspect the rubber hose connected to the rear fuel tank for any damage or cracks that could be causing air to enter the fuel line. Additionally, check the colour of the fuel; if it appears very black, this could indicate an issue with the fuel.
To test the sending units, you can perform the following steps:
- Switch the dash gauge to the proper tank.
- Go to that tank and pull the plug off to locate the sending unit wire (it is usually blue/yellow or yellow/blue).
- Turn the key to the "run" position but do not start the engine.
- Ground the sending unit wire; the gauge should read full scale empty or full.
- Take the sending unit wire off the ground and let it hang in the air.
- The gauge should now swing full scale in the opposite direction.
- If the gauge passes this test, the issue lies with the sending unit.
If you need to replace the fuel lines, you can separate them from the fuel tank by using a quick-connect removal tool to pop off the fittings. Alternatively, you can use a neat trick with a piece of plastic round tube:
- Cut a short piece of plastic round tube open at both ends.
- Cut it down the middle longways so that it can fit around the gas line.
- Pull the fuel line connection side away as if you are taking it off.
- Slide the plastic tube inside the connection.
- Push the connection toward the tube without allowing the tubing to move.
- With one motion, slide the connection and tube simultaneously off the fitting.
By following these steps and performing thorough checks and tests, you should be able to identify and resolve most fuel gauge issues with your 1983 F150.
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Removing rear fuel tank
To remove the rear fuel tank of a 1983 F150, you will need to first drain the tank completely. Once this is done, locate the fuel lines that connect to the tank and carefully disconnect them using a quick-connect removal tool. You may need to refer to a 1983 F150 fuel tank diagram to identify the correct fuel lines. Be very careful not to break any of the connectors.
After the fuel lines have been disconnected, you will need to remove the tank itself. This can be a challenging task, as the tank is usually held in place by a combination of bolts, straps, and brackets. You will need to remove these fasteners securely before attempting to lower the tank. It is recommended to have an assistant to help guide the tank as it is removed and ensure it does not get stuck or damaged.
Once the tank is removed, you will need to address the fuel lines. Depending on your setup, you may need to join the two rear lines together, as per the recall instructions from Ford. Alternatively, you can connect the front tank's fuel line directly to the fuel filter and ensure the dash switch is set to the front fuel tank.
Finally, inspect the removed tank for any signs of damage or corrosion. If you plan to reinstall the tank, this is a good opportunity to clean it and replace any faulty components, such as the rubber mounting pads, vent grommets, vents, filler neck, and vent pipe. Reinstallation will require careful reconnection of the fuel lines and securing the tank back into place.
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Replacing fuel lines
The fuel line in your Ford F-150 is a critical component, delivering fuel from the tank through a filter and into the engine. While it rarely needs changing, if the fuel line is old, worn, or cracked, it should be replaced as soon as possible.
Before beginning the replacement, ensure you release the gas line pressure or drain as much gas out of the line as possible to avoid spraying fuel when you disconnect the line from the fittings.
Firstly, bypass the quick-disconnect coupler, which will make replacing the fuel filter easier and can be done without special tools. Then, route the hose away from the catalytic converter and exhaust pipes, and reattach the fuel rail bracket. Next, cycle your engine from "Off" to "Run" and listen for the fuel pump, while also checking for leaks. If anything seems wrong, release the pressure from the lines, inspect your work, and re-tighten any loose connections.
To disconnect the fuel line, you will need a quick-connect removal tool. This is inserted inside the fitting and then popped off. You can also use a neat trick with a short piece of plastic tube: cut it down the middle, place it around the gas line, pull the fuel line connection side, slide the tube inside the connection, and then, in one motion, slide the connection and tube off the fitting together.
When replacing the fuel line, it is also recommended to replace the fuel filter at the same time if it is not brand new. Additionally, be prepared to replace other parts such as the rubber mounting pads, vent grommets, vents, filler neck, and vent pipe.
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Filler neck and vent tube problems
The filler neck and vent tube can cause several problems for 1983 F150 owners. The design of the filler neck and vent tube in the 1983 F150 has been described as problematic, with some owners choosing to upgrade to the 1987 model. The plastic vent hose in the 1983 model has been known to collapse, causing issues with filling up the tank. This can be rectified by upgrading to the 1987 model, which features a larger hose, or by using a heavy plastic filler hose inside the steel vent neck.
Some owners have also reported issues with the charcoal canister, which can become full, causing problems with the air being ported back to the top of the filler neck. Others have suggested that the vent hose may not be connected properly, or that the top vents may not be functioning correctly, causing similar issues.
In some cases, the filler neck vent may become loose from the tubes it is supposed to connect to, or it may become damaged or blocked, preventing the tank from filling properly. This can be resolved by replacing the filler neck and vent tube assembly, or by using a hose clamp to secure the vent hose.
It is also important to check for any blockages or damage in the fuel lines, as this can cause the engine to cut out or run poorly. The rubber fuel lines should be inspected and replaced if necessary, and the fuel filter should be checked to ensure it is not clogged.
When working on the fuel tank and lines, it is important to take the necessary safety precautions to prevent injury or damage to the vehicle. It is recommended to refer to a qualified mechanic or technician if you are unsure about any aspect of the process.
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Fuel transfer issues
Leaky or Damaged Fuel Lines: Inspect the fuel lines for any signs of damage, cracks, or leaks. If the fuel lines are compromised, it can lead to fuel leakage and affect the overall engine performance. Replacing the rubber fuel lines and ensuring secure connections can help address this issue.
Clogged Fuel Filter: A clogged or dirty fuel filter can restrict the flow of fuel, leading to engine performance issues. Regularly cleaning or replacing the fuel filter as per the recommended maintenance schedule is important to maintain optimal fuel flow.
Ventilation Problems: Proper ventilation is crucial for the fuel system to function correctly. Check the filler neck vent, vent tube, and top vents to ensure they are not blocked or disconnected. Restricted ventilation can lead to air being trapped in the fuel system, causing fuel transfer issues.
Fuel Tank Condition: Inspect the fuel tank for any signs of rust or corrosion, especially if it is an older vehicle. A rusted fuel tank may leak and affect fuel transfer. In some cases, it may be necessary to replace the fuel tank and associated components, such as the sending unit and fuel lines.
Fuel Cap Malfunction: A faulty fuel cap can cause issues with the fuel transfer system. Check for any signs of damage or blockage in the fuel cap, as it contains a one-way check valve that can get plugged, leading to engine performance problems.
Selector Valve Connection: If your vehicle has a dual-tank system, ensure that the selector valve is properly connected and functioning. Issues with the selector valve can lead to fuel transfer problems when switching between the rear and front tanks.
It is important to consult a qualified mechanic or refer to a reliable repair guide specific to your 1983 F150 model for detailed instructions on troubleshooting and resolving fuel transfer issues.
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Frequently asked questions
You can use a quick-connect removal tool to disconnect the fuel lines at the tank of your 1983 F150. You can also try the following:
- Find a short piece of plastic round tube that is open on both ends, cut it down the middle, and fit it around the gas line.
- Pull the fuel line connection side as if you are taking it off.
- Slide the plastic tube inside the connection, push the connection toward the tube without allowing the tubing to move.
- With one motion, slide the connection and tube at the same time off the fitting.
To separate the fuel tank lines of your 1983 F150, you can try the following steps:
- Check if there is a factory switch for dual tanks, usually in the AC control panel, opposite the fan speed switch.
- If a factory switch exists, try to get it to work as a factory setup.
- Wire colours do not matter as much as what the wire does and where it connects.
To remove the rear fuel tank of your 1983 F150, you can try the following steps:
- Check with your local Ford dealership as there was a recall for fuel transferring to the rear tank.
- If you remove the rear tank, you must join the two rear lines together.
- You can also break the tubes off the fuel pump using pliers and cap the tubes with a rubber hose, a bolt, and hose clamps.
