Rajan Wilcox
Bypassing a fuel tank selector switch is possible, but it is important to understand the potential risks and challenges. Some vehicles, such as Ford trucks with dual fuel tanks, may experience issues with the selector switch, resulting in problems such as incorrect fuel gauge readings, air intrusion, or fuel returning to the wrong tank. While it is possible to bypass the selector valve by disconnecting the FSV connector and using jumper wires or splicing fuel hoses, it is important to consider the potential consequences. Leaving the selector switch intact and regularly switching tanks can prevent issues with the switch sticking or fouling. Additionally, attempting to bypass the switch may void warranties and should only be attempted by those with the necessary expertise and understanding of the vehicle's systems.
Characteristics and Values
| Characteristics | Values |
|---|---|
| Issues with fuel tank selector switches | Incorrect fuel gauge readings, air intrusion/rough running, switching tanks but fuel gauge reading incorrect tank, fuel returning to the wrong tank |
| Solutions | Disconnect FSV connector and put a jumper wire between terminals for DB/Y and Y/WH wires, splice in a section of hose to bypass the valve on supply and return lines, cut and join RED and RED/WHITE wires from the switch connector |
| Considerations | May need to cut connectors, which can make it difficult to put the selector valve back later |
| Alternatives | Leave the selector valve set to the front tank to avoid issues with the rear tank, replace the selector valve with modern solenoids, or buy a replacement |
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What You'll Learn
Disconnect the FSV connector and jumper wire
Disconnecting the FSV connector and using a jumper wire is a non-destructive method to bypass the fuel tank selector switch. This method will leave you with less work if you decide to recommission both tanks in the future.
To begin, locate the wires in the switch connector that need to be cut. In some cases, this may be the RED wire and the RED/WHITE wire. Once you have identified the correct wires, cut them from the switch connector.
After cutting the wires, join them together. This will bypass the fuel switch and allow you to run directly off the front tank. Ensure that you have the necessary tools and knowledge to perform this task safely and effectively.
It is important to note that modifying your vehicle's fuel system can be dangerous if not done correctly. Always refer to a professional mechanic or a certified technician for guidance and advice. They will be able to provide personalized instructions and ensure that the procedure is carried out safely.
Additionally, keep in mind that bypassing the fuel tank selector switch may affect your vehicle's performance and fuel efficiency. It is recommended to consult with a specialist before making any modifications to your vehicle's fuel system.
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Cut and join wires from the switch connector
To bypass a fuel tank selector switch, one method is to cut and join wires from the switch connector. This can be done by locating the wires that lead to the switch and cutting them from the connector. Then, these wires can be joined together to bypass the switch.
For example, in a 1992 Ford F250 dual fuel tank truck, the RED wire and the RED/WHITE wire from the switch plug can be cut and joined together to bypass the fuel tank selector switch. This method may also work for other Ford trucks with dual fuel tanks.
In another case, a user wanted to bypass the fuel selector switch in a 1975/79 F100/350 with dual fuel tanks. They located the sender wire and the connector wire that feed into the switch. However, they were unsure if it would be safe to join these wires due to the different gauges of the wires.
It is important to note that working with vehicle electrical systems can be complex and dangerous. It is always recommended to consult a qualified professional or a mechanic with experience in automotive electrical systems before attempting any modifications or repairs.
Additionally, when working with fuel systems, it is crucial to take the necessary safety precautions to prevent fires or explosions. This may include working in a well-ventilated area, avoiding open flames or sparks, and wearing appropriate protective gear.
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Splice a hose into the supply and return lines
If you want to bypass a fuel tank selector switch, one method is to splice a hose into the supply and return lines. This involves cutting the lines and joining them together to create a continuous fuel flow without the need for the selector switch.
Firstly, identify the supply and return lines to and from the engine and the front and rear tanks. You will need to disconnect the supply line from the inlet of the selector valve, either at the front or rear port. Cut the lines a few inches away from the switch, so you have enough room to work with and can splice them back together if needed.
Once the lines are cut, join them together using a fitting or a new line. You can use a temporary hose to connect the selector valve to an alternate fuel container to test if the system operates normally. If it does, the problem is with the selector valve, and you may need to replace it. If the system doesn't operate normally with the alternate fuel source, the issue lies elsewhere, and you can proceed with bypassing the selector switch.
Join the feed and return lines from the engine directly to the feed and return lines of the tank you want to use (usually the front tank). You can use short fuel hoses and hose clamps to make this connection. Ensure that your dash fuel gauge is set to the front tank to continue receiving accurate readings.
By splicing the supply and return lines, you create a direct fuel path, bypassing the need for the selector switch. This method is a simple workaround, but it is important to note that reconnecting the selector valve later will require cutting the hoses and reconnecting the lines, which can be challenging.
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Cut lines a few inches from the switch
If you want to bypass the fuel tank selector switch in your truck, one option is to cut the lines a few inches away from the switch. This method is suggested as a way to avoid cutting all the connectors, which would make it difficult to put the selector valve back in place later.
To begin, locate the hose coming from your front tank to the valve. The valve ports will have directional arrows indicating which hose is going to the engine and which is coming from it. You will need to bypass the valve on both the supply and return lines.
Cut the lines a few inches from the switch and splice them back together. This can be done by simply inserting a section of hose in each line that is long enough to connect the lines in place of the valve.
By keeping the switch set to the front tank, your dash fuel gauge will continue to function using the signal from that tank. It is also recommended to only use this method if your selector switch is not leaking.
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Keep the switch set to the front tank
Keeping the switch set to the front tank is a viable option if you are the only one driving your truck. This is because, if you have not used the rear tank in a long time, you could encounter problems if you use the switch. The switch may get stuck, and you may not be able to get it back. Therefore, leaving the switch set to the front tank and not tampering with it might be the best course of action.
To ensure that you do not face issues with the switch, it is recommended to switch tanks frequently to prevent the switch from fouling or sticking. This can be achieved by alternating between filling the tanks each time.
If you still want to bypass the switch and use the rear tank, you can do so by locating 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 hose is coming from it. You will then need to bypass the valve on both the supply and return lines by splicing in a section of hose in each line long enough to connect the lines in place of the valve.
Another option is to disconnect the FSV connector and put a jumper wire between the terminals for the DB/Y and Y/WH wires on the connector. However, this method may not work for all vehicles.
If you are considering bypassing the fuel tank selector switch, it is essential to consult a professional mechanic or seek advice from experts in automotive forums to ensure that you are taking the appropriate steps for your specific vehicle.
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Frequently asked questions
If you want to bypass the selector switch, you can cut the wires from the switch connector and join them together.
If you bypass the switch, you may experience issues such as not being able to switch tanks, or your fuel gauge reading the incorrect tank. You may also experience air intrusion or rough running.
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.
You can leave the selector valve set to the front tank so your dash fuel gauge keeps working with the signal from the front tank.
First, 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 is coming from it. Then, simply splice in a section of hose for each line that is long enough to connect the lines in place of the valve.
