Rajan Wilcox
The Pollak 6 Port Fuel Valve Motorised 42-159 Dual Fuel Tanks is a valve designed for people running dual fuel tanks in their cars, 4WDs, and boats. The valve is motorized and is driven into position by an electric motor, only drawing power for a fraction of a second during transfer. The Pollak valve includes six ports, eliminating the need to run dual three-way valves. This simple function ensures fuel is recirculated and contained as opposed to returning to the wrong tank and potentially overflowing.
| Characteristics | Values |
|---|---|
| Ports | 6 |
| Ports 1 and 2 | Take fuel from fuel tank A and B |
| Port 3 | Delivers fuel to the engine |
| Port 4 | Receives unused fuel back from the engine |
| Ports 5 and 6 | Return the unused fuel back to tank A and B |
| Current Draw | 0.5 Amps max |
| Voltage | 12 Volts DC |
| Optional Voltage | 24v to 12v Pollak compatible waterproof power adapter |
| Hose for fuel supply | Fits 3/8" I.D. Hose |
| Hose for return lines | Fits 5/16" I.D. Hose |
| Power Usage | Only uses power during a switch or movement operation |
| Shift Time | 1 second |
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What You'll Learn
Wiring dual fuel tanks to a single gauge
Firstly, it is essential to identify the type of switch and valve in your system. Older models from the 1970s had a manually operated fuel tank selector valve, while newer models have an electric fuel tank selector valve and solenoid assembly. The switch type varies, and you need to determine whether you require a single pole double throw switch, a DPDT switch, or another variation.
Secondly, you need to understand the wiring diagram for your specific vehicle. Wiring diagrams are available for various vehicle models and years, and these diagrams can guide you in properly connecting the wires to the selector valve and the gauge. It is important to match the wiring colours correctly to ensure the system works as intended.
Lastly, testing the sending units and ensuring they are not stuck is crucial. The sending units should read about 30 ohms when empty and near zero ohms when full. You may need to switch the sender wire between the tanks and ensure they are grounded for accurate readings.
It is worth noting that some users have linked both tanks with a tap and used a single sender unit, designating one tank as the main and the other as the reserve. This approach simplifies the wiring process and reduces the need for complicated setups. However, it is important to monitor the fuel levels in both tanks to avoid issues.
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Troubleshooting dual fuel tank wiring
Identifying the Issue
Firstly, it is important to identify the specific problem with your dual fuel tank wiring. Some common issues include faulty gauges, issues with sending units, or problems with the fuel system's wiring. For instance, if your gauges are not working, it is unlikely that both sending units failed simultaneously, so the issue may lie elsewhere.
Checking Wiring and Connections
Begin by inspecting the wiring for any signs of damage, such as cut or loose wires. Ensure that all connections are secure and that there are no signs of corrosion or damage. If you find any issues, repair or replace the affected components.
Testing Sending Units
If you suspect that the issue lies with the sending units, you may need to test them. In some cases, sending units can become stuck in the empty position, leading to inaccurate readings. You may need to remove and test the sending units or clean or replace them if they are faulty.
Understanding Switch Types
Issues with switches are also common. Ensure you are using the correct type of switch for your setup. For example, a single pole dual throw switch may be more suitable for your needs. Additionally, check if your switch requires power or ground connections, as this can vary depending on the switch type.
Seeking Additional Resources
If you are unsure about the wiring diagram or specific components, seek additional resources such as online forums, vehicle-specific manuals, or expert advice. These resources can provide valuable insights and guidance on troubleshooting and resolving wiring issues related to dual fuel tanks.
Remember, electrical systems can be complex and dangerous, so always exercise caution and consult a professional if you are unsure about any aspect of the troubleshooting process.
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Using a DPDT switch
A DPDT (Double Pole, Double Throw) switch is used to switch between two fuel tanks. It allows you to run two separate fuel tanks and draw from one tank at a time.
The DPDT switch requires no power or ground unless it is a lighted switch. It is important to note that there should be no wire from the ignition switch to the selector switch unless it is a lighted switch.
To wire the DPDT switch, follow these steps:
- Cut the wire going to the main sensor and attach it to the center post on the switch.
- Attach the wire coming out of each tank sensor to the two other poles on the switch.
- Ensure that the senders have similar resistance/range.
- Connect the selector switch to +12v.
It is also possible to use a single pole double throw (SPDT) switch. However, if the senders differ in resistance, you may get an inaccurate reading from the second tank.
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Pollak 6 Port Fuel Valve Motorised 42-159 Dual Fuel Tanks
The Pollak 6 Port Fuel Valve Motorised 42-159 Dual Fuel Tanks is a motorised valve that only uses power during a switch or movement operation. The valve is designed for installation downstream of your existing vehicle's fuel pump and is rated for a maximum of 60psi fuel pressure. The valve is supplied with moulded hose nipples, which minimise the risk of leaks. To install the valve, simply push on your fuel hoses and apply a suitably sized hose clamp. The hose ends have been sized for the most common applications and suit 3/8" or 10mm fuel hose to your engine with 5/16" or 8mm return lines to your fuel tank.
The Pollak valve includes six ports, eliminating the need to run dual three-way valves. Ports 1 and 2 take fuel from fuel tanks A and B, respectively. Port 3 delivers fuel to the engine, while port 4 receives unused fuel back from the engine. Finally, ports 5 and 6 return the unused fuel to tanks A and B, respectively. This ensures that fuel is recirculated and contained, preventing potential spills.
The Pollak valve is supplied with a wiring harness, making installation straightforward. To select tank A, apply 12V across two terminals. To select tank B, apply 12V across another set of terminals. A DPDT switch can also be offered to aid in installation and allow for quick and easy swapping between tanks.
The Pollak valve is a trusted product, used by many original equipment manufacturers (OEMs) for vehicle fuelling applications. It has a robust design, including weatherproof electrical connections and boots, ensuring years of trouble-free operation.
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Applying 12v to the selector valve wires
Applying 12 volts to the selector valve wires is a task that requires careful attention to detail and a basic understanding of electrical systems. Here is a step-by-step guide on how to do it:
First, it is important to understand the role of the selector valve in a dual-tank fuel system. The selector valve allows the fuel system to switch between the two tanks, ensuring a consistent fuel supply. This process involves electrical components, including wires and a power source, typically a 12-volt battery.
To begin the process of applying 12V to the selector valve wires, locate the valve underneath the vehicle, near the fuel tanks. Identify the wires connected to the selector valve; there should be multiple wires, including one wire connected to each tank for the sending units and one wire going to the selector valve itself. Ensure that these wires are intact and not damaged or cut.
Next, refer to the wiring diagram or schematic for your specific vehicle or application. This diagram will help you identify the correct wires and their functions. Locate the 12V wire that supplies power to the selector valve. This wire should be connected to the positive terminal of the 12V battery.
Using appropriate tools and safety precautions, carefully connect the 12V wire to the positive battery terminal, ensuring a secure and solid connection. It is important to use insulated tools and wear protective gear when working with electrical systems to prevent short circuits and potential injuries.
After making the connection, verify that the selector valve is now powered by checking the voltage at the valve with a multimeter or voltage tester. A reading of approximately 12V indicates a successful connection. At this point, you can start the engine and observe whether the fuel system switches between the tanks as expected.
If the selector valve operates correctly, you can proceed to secure and route the wiring to ensure it is safely away from any moving parts or potential sources of damage. Refer to vehicle-specific instructions or consult a professional if you are unsure about the wiring routing.
By following these steps and paying close attention to safety and connectivity, you can successfully apply 12V to the selector valve wires in your dual-tank fuel system.
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Frequently asked questions
It is a switch with two positions, either on-off or on-on.
It is a motorised valve that only uses power during a switch or movement operation. It allows drivers to select tank A or B.
You can refer to wiring diagrams for your vehicle. You can also refer to forums for advice.
It is a valve that allows you to run two separate fuel tanks and only draw off of one tank at a time.
It is a switch that integrates with the Pollak valve to allow the user to swap between tanks A and B.
