Mercedes Mullins
Wiring a fuel tank to a truck involves connecting the tank to the truck's fuel gauge and fuel pump. The process varies depending on the truck model and the type of fuel pump being used. For example, some trucks use a 6-port fuel selenoid/switch, while others use a 3-port. Additionally, there are two types of fuel pumps: standard pumps mounted inside the fuel tank and inline pumps mounted underneath the car. When wiring a fuel pump, it is important to label the positive and negative wires to avoid electrical issues. Furthermore, the fuel tank must be grounded to the truck's cab, which should be grounded to the engine and the negative terminal of the battery.
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What You'll Learn
- Wiring a fuel pump: label positive and negative wires to avoid shocks or sparks
- Grounding the tank: connect the ground wire to the truck's electrical ground surface
- Fuel gauge issues: a bad gauge, sending unit, broken wire, or failing circuit board
- Dual fuel tanks: use a wiring diagram to connect the tanks to a single gauge
- Installing an auxiliary tank: clear the area, place the tank, and drill holes to mount it
Wiring a fuel pump: label positive and negative wires to avoid shocks or sparks
Wiring a fuel pump is a complex task that requires careful attention to safety. Before you begin, it is imperative that you disconnect the car battery to ensure no electricity is running through the system. Additionally, remove the fuse of the fuel pump from the fuse box. These precautions are crucial as electricity can be extremely dangerous, and a spark from a loose wire can ignite fuel vapors, leading to a catastrophic event.
Once you have addressed the safety measures, you can start wiring the fuel pump. The positive wire from the fuel pump should be connected to the positive wire from the vehicle's wiring harness. Ensure that the connection is tight and secure to prevent heat generation and voltage disruption, which could burn the wire and damage the pump.
Next, attach the ground (negative) wire from the fuel pump to a nearby electrical ground surface, typically the frame of your car. Again, make sure the connection is clean, rust-free, and securely tightened. A loose connection can cause heat generation and voltage issues, affecting the pump's functionality.
It is essential to label the wires as positive or negative to avoid confusion and potential hazards. Typically, the red wire is positive, while the black wire is negative. Interchanging the polarity of these wires can damage the fuel pump or the entire electrical system of the vehicle.
Finally, consider the overall wiring design to prevent wires from being scattered throughout the engine bay. Use clips and zip ties to neatly bundle the wires together, ensuring they are not too close to the hottest part of the engine to avoid melting.
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Grounding the tank: connect the ground wire to the truck's electrical ground surface
When grounding the tank, it is essential to connect the ground wire to the truck's electrical ground surface. This is a crucial step to ensure the fuel system operates correctly and safely.
First, identify the ground wire from the fuel pump. It is typically black and should be labelled with a "-" symbol. This wire needs to be securely attached to the truck's electrical ground surface, which is usually the frame of the vehicle.
Before making the connection, inspect both the connector on the end of the wire and the surface area where you will be attaching it. Ensure that they are clean and free of any rust or debris. A clean connection point is vital to establish a proper electrical ground.
Once you have identified the connection points and ensured they are prepared, you can proceed to attach the ground wire. Use appropriate tools and techniques to make a tight and secure connection. A loose connection can cause various issues, including voltage supply disruption and potential damage to the wire and pump.
It is worth noting that the process of grounding the tank may vary slightly depending on the specific truck model and fuel system configuration. Some trucks may have additional grounding points or slightly different wiring setups. Therefore, it is always recommended to refer to the truck's service manual or seek guidance from a qualified technician if you are unsure about any aspects of the grounding process.
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Fuel gauge issues: a bad gauge, sending unit, broken wire, or failing circuit board
Fuel gauge issues can be a headache to diagnose, but they are usually caused by either a bad gauge, a bad sending unit, a broken wire, or a failing circuit board.
A bad fuel sending unit is the most common cause of fuel gauge issues. The sending unit is used to measure the amount of fuel in the tank and communicate this to the gauge on the dashboard. If the sending unit fails, the gauge will be affected. A faulty resistor in the sending unit can cause the gauge to read empty by restricting the signal, while a faulty float can cause the gauge to get stuck on full. The float is designed to float on the surface of the fuel, and as the level drops, the position of the float and its attached arm will shift and move a resistor, which controls the display on the gauge. Over time, the constant movement of the wiper in the variable resistor can wear down the resistive material strip, creating an open circuit. Corroded wires can also stop voltage from reaching the fuel gauge.
A faulty ground wire to the grounding terminal or a defect in the wiring from the sending unit to the gauge can also cause a shorted signal, resulting in inaccurate readings. A poor connection with the signal wire from the sending unit or a poor grounding wire can also cause issues. A multimeter can be used to check the voltage of the gauge wire, which should be receiving 12 volts. If the voltage is different at either end of the wire, there is likely corrosion or poor wiring between the sending unit and the gauge.
In some cases, the fuel gauge itself may be faulty. Many modern cars and trucks have electronic fuel gauges with a built-in self-test procedure, which can be used to determine if the issue is with the gauge or the sending unit. If the gauge does not complete a run from full to empty, this indicates that the issue is with the gauge itself.
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Dual fuel tanks: use a wiring diagram to connect the tanks to a single gauge
Wiring dual fuel tanks to a single gauge can be a tricky process. The first step is to identify the type of switch and fuel tank selector valve you have. For example, 1973/74 Ford F250 trucks have a manually operated fuel tank selector valve on the floor, adjacent to the driver's seat. In contrast, 1975/79 models have an electric fuel tank selector valve and solenoid assembly that mounts on the frame rail. Once you know the type of switch and selector valve you have, you can refer to the appropriate wiring diagram.
If you are unsure about the wiring diagram, you can refer to factory wiring diagrams or seek help from online forums. It is important to note that you cannot expect one circuit to monitor two tanks. Therefore, you will need to wire a switch so you can select either fuel sender, and the gauge will read that tank. This can be done using a single pole dual throw switch or a double pole, double throw (DPDT) switch.
When wiring the switch, ensure that the senders are grounded, or they won't work. Additionally, you will need to hook up the ground wire on the unused sender and tank. You can test the sending unit with a multimeter; the sender should read about 30 ohms empty and near zero ohms full.
Finally, it is important to note that the fuel pump pulls from both tanks at once. Therefore, you will need to isolate the lowest tank to avoid sucking air from the first empty tank.
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Installing an auxiliary tank: clear the area, place the tank, and drill holes to mount it
When installing an auxiliary diesel fuel tank, it is important to ensure that you have a spacious work area to avoid accidents and injuries. Start by removing any items inside the bed of the truck, such as a bed mat. Although auxiliary diesel fuel tanks are typically not very heavy, having an extra set of hands can be helpful when lifting the tank into the bed of your truck.
Before drilling any holes, determine the placement of the auxiliary tank. It is recommended to install the tank away from the sides, front, and back of the bed to prevent it from rubbing against the truck bed and causing potential damage. Mark the holes where you will install the tank on the truck bed using a brightly coloured marking tool like a wax pen or chalk. This helps ensure that you drill in the correct spots.
Once you have marked the mounting locations, remove the auxiliary tank from the bed. Use a centre punch on the marked locations to prevent the drill bit from straying. Start by drilling pilot holes with a small bit before drilling the final holes with a bit that matches the size of your bolts. Before drilling, check the undercarriage of the truck bed to avoid drilling into important components, such as your existing fuel tank.
After drilling the holes, determine how you will run the fuel supply line from the auxiliary tank to your existing factory fuel tank. Then, bolt your new auxiliary diesel fuel tank into place, securing it firmly to the truck bed.
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Frequently asked questions
Wiring a fuel tank to a truck involves a few key steps:
- Identify the type of fuel pump in your truck (standard or inline).
- Label the positive and negative wires on the fuel pump to avoid electrical issues.
- Ensure the car battery is disconnected and the fuse for the fuel pump is removed before proceeding.
- Connect the wires to the appropriate places, joining the positive wire from the fuel pump to the positive wire from the vehicle's wiring harness.
- Securely attach the ground wire from the fuel pump to an electrical ground surface, typically the frame of your car.
Some common issues with fuel tank wiring include:
- Loose or rusted connections.
- Damaged wiring.
- Faulty ignition switch, fuel pump relay, or fuse.
Wiring dual fuel tanks to a single gauge typically involves:
- Identifying the wiring diagram for your specific vehicle.
- Ensuring the correct wires are connected to each tank and the selector valve.
- Following the wiring diagram to properly connect the gauge.
Installing an auxiliary diesel fuel tank involves the following steps:
- Clear the truck bed and remove any unnecessary items, including the bed mat.
- Get assistance in carrying the heavy auxiliary diesel fuel tank to the truck.
- Place the tank in the appropriate position, ensuring there is room in the front and sides.
- Mark the points where the mount on the tank will meet the truck bed.
- Drill holes in the truck bed at the marked points.
