Katerina Swanson
Bypassing a fuel tank selector switch is a procedure that involves manipulating the wiring or fuel lines to override the default system that chooses which tank is being read by the fuel gauge. This is often done to install a second fuel gauge for each tank or to address issues with the selector switch. The process varies depending on the vehicle's make, model, and year, with different methods suggested for Ford F-150, F-250, and F100/350 models. Some methods involve disconnecting wires and joining them, while others suggest using a piece of smooth tubing to bypass the selector valve.
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What You'll Learn
Splicing wires
To bypass a fuel tank selector switch, you will need to identify the wires that lead to the tank and the gauge. Once you have located these wires, you can splice them together, bypassing the selector switch. This process involves cutting and joining the wires to create a continuous connection.
It is important to note that splicing wires should be done with caution and a good understanding of the electrical system. Before beginning any work, ensure you have a wiring diagram for reference and take necessary safety precautions.
When it comes to the actual splicing process, there are a few methods you can use. One common method is to use crimp connectors. This involves stripping the insulation from the wires, connecting them using a crimping tool, and then covering the connection with electrical tape or heat shrink tubing. However, in the context of fuel tanks, it is advised against using tape or heat shrink as these could melt in the presence of gas and clog the fuel pump.
Another method is soldering, which creates a strong and reliable connection. This involves melting solder onto the wires to create a secure joint. It is important to ensure a good soldering technique to avoid dry joints. After soldering, you can apply heat shrink tubing to insulate and protect the connection.
Additionally, it is crucial to consider the wire gauge when splicing. In one case, an individual sought advice on whether it was safe to join a 16-gauge sender wire and an 18-gauge connector wire directly to a fuel gauge wire. It is recommended to consult a professional or an expert forum before proceeding with any wire splicing, especially if there are doubts about safety or electrical compatibility.
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Disconnecting the FSV connector
To disconnect the FSV connector, you must first locate the FSV. The FSV is usually located on the frame under the driver's seat. However, in some models, it may be tucked on top of a cross member in between the frame and the mid-tank skid plate, or covered by the fuel tank. Once you have located the FSV, you can disconnect the connector and put a jumper wire between the terminals for the DB/Y and Y/WH wires on the connector.
It is important to note that the wiring diagram for the fuel selector switch may be complicated, and you should exercise caution when working with electrical components. Additionally, ensure that you have the correct wiring diagram for your specific vehicle.
After disconnecting the FSV connector, you may need to redo your fuel lines with hoses. You may also need to install in-tank screens to prevent plastic pieces from restricting fuel flow. Regularly checking the inline filter will help ensure that it is not clogged with plastic pieces.
Overall, disconnecting the FSV connector is a viable option to bypass a fuel tank selector switch, but it requires careful planning and execution to ensure a safe and proper installation.
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Using a smooth tube
Bypassing a fuel tank selector switch can be done in several ways, depending on the vehicle and the specific setup of the fuel system. One method that can be used involves utilising a smooth tube.
This method is described by an individual with a Ford F-150 who wants to regain use of both tanks and have the gas return to its source. They suggest that all that is required is a piece of smooth 3/8" tube, about 2" long. It is crucial that the tubing is precisely 3/8" OD, not deviating by even 1/100th of an inch, to ensure a proper fit and seal. This tube is used to bypass the selector valve, which is located on the frame rail, driver's side, just behind the cab. It is worth noting that removing a skid plate over the front tank may be necessary to access the valve.
Another individual with a Ford F250 diesel truck also mentions using a smooth tube to bypass the fuel selector valve. They suggest using a 2" or slightly longer piece of tube to connect the angled ends of the fuel return lines from the tanks. This tube should fit snugly and can be secured with wire or zip ties.
It is important to note that bypassing the fuel tank selector switch may require careful consideration of the fuel return lines and potential challenges with fuel flow. One suggestion is to block off one of the return lines with a homemade plug or tube with silicone. Additionally, when using air pressure to get the fuel flowing, it is advised to keep the pressure very low to avoid over-pressurising the tank.
While using a smooth tube to bypass the fuel tank selector switch can be a viable option, it is always recommended to refer to vehicle-specific instructions and consult with qualified professionals for guidance on safely bypassing the fuel tank selector switch.
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Bypassing the valve
Firstly, you need to locate the hose coming from your front tank leading to the valve. The valve ports will have directional arrows indicating which hose is going to the engine and which is coming from it. Once you've identified these, you can proceed to bypass the valve on both the supply and return lines. This can be done by splicing in a section of hose in each line that is long enough to connect the lines in place of the valve.
Another method involves disconnecting the FSV connector and putting a jumper wire between the terminals for the DB/Y and Y/WH wires on the connector. This option is non-destructive and will leave you with less work if you ever decide to recommission both tanks.
If you have a dual-tank system, you may encounter issues with the fuel return line. To address this, you can put the angled ends of the return line against each other with a 2" or slightly longer piece of tube. This will create a snug fit and can be secured with wire or zip ties.
Additionally, if you want to install a second fuel gauge for each tank, you will need to identify the wires going to the tank and the gauge. You can then splice them with a third wire leading to the gauge, but ensure that you have the correct wiring diagram and that it is safe to do so.
It is important to note that these procedures may vary depending on the make and model of your vehicle, and it is always recommended to consult a professional or refer to specific vehicle instructions for more accurate guidance.
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Removing bolts
Begin by locating the fuel tank selector valve, which is typically found on the frame rail, driver's side, just behind the cab. In some cases, there may be a skid plate over the front tank, which will need to be removed first. Once you have accessed the fuel tank selector valve, you will need to remove the bolts securing it in place. The number of bolts can vary, but for certain models, there are four bolts, with the front passenger side bolt being particularly challenging to remove. Using the appropriate tools, carefully remove these bolts, ensuring that you do not strip the threads or damage surrounding components.
After removing the bolts, you may need to address the wiring connected to the fuel tank selector switch. This involves identifying the wires associated with the tank and the fuel gauge. Splicing these wires or joining them with a third wire can bypass the switch. However, it is important to exercise caution when working with electrical components, especially in the presence of flammable fuels.
In some cases, you may need to remove additional components to access the fuel tank selector switch. This can include removing screws from metal panels under the dashboard or disconnecting hoses and lines from the valve. It is important to refer to vehicle-specific repair manuals or seek advice from experienced mechanics or online forums for your particular vehicle's requirements.
Additionally, it is worth noting that bypassing the fuel tank selector switch may impact the fuel return to the tanks. As such, it is crucial to consider the implications of any modifications and ensure that the fuel system remains safe and functional. Always refer to professional advice or seek assistance from qualified individuals when performing any fuel system modifications or repairs.
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Frequently asked questions
To bypass a fuel selector switch, you can disconnect the FSV connector and put a jumper wire between the terminals for the DB/Y and Y/WH wires on the connector.
One way is to locate the hose coming from your front tank leading to the valve. The valve ports will have directional arrows showing which hose is going to the engine and which hose is coming from it. You can then bypass the valve by splicing in a section of hose on both the supply and return lines.
A non-destructive method is to simply disconnect the FSV connector and put a jumper wire between the terminals for the DB/Y and Y/WH wires.
You can find the wires that feed into the switch, the sender wire and the connector wire, and splice them with a third wire to lead to the gauge.
You can cut the red wire and the red/white wire from the switch connector and join them together.
