Mercedes Mullins
Ford F-150, F250, and F350 models from the 1980s to the 2000s feature a fuel tank selector valve, allowing drivers to switch between the front and rear tanks. This valve is located on the driver's side, behind the cab, and can be challenging to access. While some owners have successfully cleaned or lubricated stuck valves, others have opted for replacement, with mixed results. Testing the valve involves checking the circuit from the fuse panel and measuring resistance to ground.
| Characteristics | Values |
|---|---|
| Vehicle Type | Ford F150, F250, F350, F450, F550, Ranger, Super Duty |
| Engine Type | Diesel |
| Engine Capacity | 6.0L, 6.4L, 6.7L, 6.9L, 7.3L |
| Part Number | 6C3Z-9189-A, 6C3Z9189A, 6005966, 5746352, F5TB9F271AA, F5TB-9F271-AA, 904-454, E9TZ9189A, F4TZ9189A |
| Valve Type | 6-Port Fuel Tank Selector Valve |
| Connector Terminals | Pin 1: Not used, Pin 2: 789 (BR/W), Pin 3: 786 (R), Pin 4: 673 (DB/Y), Pin 5: 29 (Y/W), Pin 6: 675 (Y/LB) |
| Testing Procedure | Apply 12V Power to Specific Terminals, Use Self-Powered Test Lamp or Ohmmeter to Check Circuits |
| Installation Difficulty | May Require Skid Plate Removal, Bolt Removal, and Fuel Line Disconnection |
| Common Issues | Valve Stuck, Weak, or Not Switching Properly, O-Rings Leaking, Fuel Gauge Issues |
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What You'll Learn
- Location: The selector valve is located on the driver's side, behind the cab
- Testing: To test the valve, you can use a ohmmeter to check the circuit
- Issues: If the valve is stuck, try tapping on it while cycling the dash switch
- Replacement: You can replace the valve, but be careful as it has a rubber diaphragm
- Workarounds: If the front tank is difficult to flow, use air pressure or join both tanks
Location: The selector valve is located on the driver's side, behind the cab
The fuel selector valve is located on the driver's side, behind the cab. More specifically, it is mounted under the driver's side of the cab, on the frame rail. It may not be easy to see if there is a skid plate over the front tank. In this case, it is recommended to remove the skid plate.
The selector valve is located on the frame rail, behind the cab, on the driver's side. It is important to note that accessing the selector valve may require removing a skid plate that could be covering the front tank. This can be done by removing four bolts, although the front passenger side bolt can be challenging to access.
The fuel selector valve is an essential component of the fuel system, allowing the driver to choose between the front and rear fuel tanks. The valve is usually controlled by a switch on the dashboard, which allows the driver to select the desired tank. In some older models, such as the 1974 Ford, the valve was manually controlled by a switch next to the seat.
The fuel selector valve is a critical component for vehicles with dual fuel tanks, such as the Ford F-150, and ensuring its proper function is vital for optimal vehicle performance.
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Testing: To test the valve, you can use a ohmmeter to check the circuit
To test the fuel selector valve in a Ford diesel vehicle, you can use an ohmmeter to check the circuit. This process involves a number of steps, and it is important to be careful throughout to avoid damaging any components.
Firstly, you should identify the terminals on the selector valve connector. These are usually labelled with pin numbers. Pin 1 is typically not used, so you can start with Pin 2 and work your way through the remaining pins.
Next, you will need to apply 12V power to the relevant terminals. For the rear tank circuit, apply power to terminals 789 (BR/W) and 786 (R). Then, connect your ohmmeter to terminals 29 (Y/W) and 675 (Y/LB). If the switch is functioning correctly, this should indicate a closed circuit.
To test the front tank circuit, briefly apply 12V power to terminals 786 (R) and 789 (BR/W). Then, connect your ohmmeter to terminals 29 (Y/W) and 675 (Y/LB) again. This time, a good switch will indicate an open circuit.
Finally, check that the source and return valve can transfer between the front and rear positions.
It is worth noting that some sources suggest additional steps for further testing. For example, connecting the ohmmeter to terminals 29 (Y/W) and 673 (DB/Y) in both the rear and front tank circuits should indicate an open circuit for the rear tank and a closed circuit for the front tank, respectively.
Additionally, if you are experiencing issues with your fuel gauge reading, you may need to take readings at different fuel levels to determine if the issue lies in the wiring to the tank or the sending unit.
It is always recommended to refer to your vehicle's manual for specific instructions and safety precautions before performing any tests or repairs.
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Issues: If the valve is stuck, try tapping on it while cycling the dash switch
If the fuel selector valve on your Ford diesel vehicle is stuck, there are a few methods you can try to free it up. It is important to exercise caution during this process to avoid damaging the valve or any other components.
Firstly, ensure you have the necessary tools and supplies for the job. Before attempting to fix the valve, turn off the fuel supply to the area.
One method to unstick the valve is to drip penetrating oil down the valve's shaft and allow it to soak in. Lightly tap the body of the valve with a hammer to help distribute the oil. Try turning the valve with your hand after tapping a few times. If you feel it starting to loosen, add more oil, tap, and turn again. Repeat this process until the valve is fully open.
Another approach involves using a hair dryer to heat up the valve body and melt any built-up gunk and grime that may be causing the valve to stick. Once the valve starts to turn, wiggle it back and forth to dislodge the grime. Use a wrench to loosen the bonnet or packing nut located beneath the handle, then turn the valve back and forth to free it up. Penetrating oil can also be used here if additional lubrication is needed.
If your Ford diesel vehicle has a rubber diaphragm-type selector valve, you may need to take it to a dealer for replacement if it is stuck and cannot be disassembled without damage.
By following these steps and exercising caution, you should be able to successfully unstick your Ford diesel fuel selector valve.
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Replacement: You can replace the valve, but be careful as it has a rubber diaphragm
The fuel tank selector valve has a rubber diaphragm, and you need to be careful while taking it apart. If you handle it incorrectly, it may become unusable, and you will have to replace it.
If you notice that your selector valve is stuck, you can take it apart to see if it is stuck and then lube the springs, pressing them up and down. If you are unsure about how to do this, you can take it to a dealer to get it replaced.
If you want to replace the valve yourself, you will need a small screwdriver. First, pop the clip out of all lines using a small screwdriver. Then, pull the lines off the valve. The valve is held on the frame rail with two bolts, and a 10mm wrench should be used to remove them. Install the new valve in the reverse order.
You can also replace the "U-shaped Clips" with rubber fuel lines and hose clamps to prevent fuel leaks.
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Workarounds: If the front tank is difficult to flow, use air pressure or join both tanks
If the front tank of your Ford diesel is difficult to flow, there are a couple of workarounds you can try.
One possible solution is to join both the front and rear tanks. This is legal for diesel engines, unlike gas engines. Older 18-wheelers used this method, with two tanks with a crossover, usually pulling from one tank and returning to the other. However, this method has its drawbacks. You would need to tap into the bottom of the tanks, as having a hose break would result in both tanks draining. Additionally, if your Ford diesel has hot fuel handling or EFI, this method will not work as the fuel pump is located inside the tanks.
Another workaround is to use air pressure to prime your fuel system. This can be done by applying air pressure of around 10-20 psi to your fuel tank. However, some people have reported using up to 40 psi to unstick the supply check valve near the tank. It is important to note that too much pressure can be dangerous, and you should only use as much pressure as is necessary to get the fuel flowing. Additionally, injecting air into the fuel is not recommended.
If you are experiencing issues with your front tank, it may be due to a faulty sending unit. In this case, you can choose to fix or replace the sender in the tank. Alternatively, you can continue using the tank with a working sender until it needs to be replaced.
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Frequently asked questions
The selector valve is located on the frame rail, on the driver's side, just behind the cab.
Try tapping on the valve while cycling the dash switch. If the valve is stuck on the rear, set the switch to the front and tap on the valve.
The O rings in the valve may be old and leaking, which can damage the electronic board and cause you to lose tank readings.
You can test the valve by checking the resistance with an ohmmeter.
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