Sylvie Willis
The voltage requirements for a fuel tank depend on the vehicle. For example, the fuel pump for a Ford Explorer should be running at the vehicle's system voltage of 12VDC +2.4VDC -0.5VDC. In another instance, a Honda Civic Del Sol requires 12 volts to be going to the fuel pump. In general, the output voltage for an alternator is between 13.7 and 14.3 volts, but the voltage at the fuel pump is lower due to voltage drop.
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What You'll Learn
The voltage at the fuel tank should be 12V
A voltage of 12V at the fuel tank is necessary to ""charge the system" with fuel so that there is pressure to fire up the engine. Once the engine is running, there is no voltage until the system reports that it is running fine. Then, the fuel pump starts pumping fuel again.
It is important to note that the voltage at the fuel pump may not always be 12V due to various factors. For example, the voltage at the pump will be affected by the length and resistance of the wiring, as well as the current being pulled. As a result, the voltage at the pump can vary from around 11.9V to 14V.
To ensure that the voltage at the fuel pump is adequate, it is recommended to measure the voltage with a voltmeter and compare it to the battery voltage. If the voltage at the pump is significantly lower than the battery voltage, it may be necessary to replace the wiring or connectors, or upgrade to a larger gauge wire to reduce resistance.
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The voltage at the pump should be close to battery voltage
Typically, the output voltage for an alternator is between 13.7 and 14.3 volts. However, due to resistance in the wiring, the voltage at the pump will be lower than the output voltage of the alternator. The voltage drop due to resistance can be calculated using Ohm's law, which states that voltage drop is equal to the product of current and resistance (V=IR).
To maximize pump speed and fuel flow, one can replace the stock pump power feed loom with a lower-resistance option, such as a larger gauge wire. Additionally, ensuring that the wiring and connectors are in good condition can help minimize voltage drop.
In some cases, the voltage at the pump may be intentionally lower than the battery voltage. For example, the initial voltage at the pump may be 12V to "charge the system" with fuel and create pressure to start the engine. Once the engine is running, the voltage may drop to 0V until the system reports that it is running fine, at which point fuel pumping resumes.
It is important to note that the voltage at the pump should not be significantly lower than the battery voltage. If there is a large discrepancy, it may indicate poor electrical connections or issues with the wiring or connectors.
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The voltage drop is caused by resistance in the upstream system
Resistance can be caused by corrosion, fretting, or even air. For instance, if a 1.0-ohm resistor is put in a fuel pump circuit, it would lower the 13.25 volts to 9.78 volts, resulting in a voltage drop of almost 4.0 volts. While this loss of voltage may not impact the idle of a vehicle, it can cause the vehicle to be starved for fuel when more volume is required, such as during acceleration.
The most common places for resistance to occur in a circuit are the load and the connector. If the connection is tight and clean, the resistance is negligible. However, if the contacts are loose, corroded, contaminated, or too small to handle the current flow, resistance increases, leading to a voltage drop. Connectors are the most likely component to exhibit high resistance and heat damage in a fuel pump circuit.
To perform a voltage drop test, specialized piercing probes are recommended to pierce the wires and take readings. This test provides immediate results regarding the quality of the connection. It is important to note that the fuel pump circuit must be energized during the test, requiring the connectors to be back-probed or the wires to be pierced.
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The pump speed is directly proportional to the voltage applied
For example, let's consider a typical car electrical system voltage of 12 volts. If the fuel pump is receiving 12 volts, it will run at a certain speed, and deliver a corresponding amount of fuel. If the voltage is increased to 13 or 14 volts, the pump speed will increase, and so will the fuel delivery rate.
In some cars, the fuel pump voltage may vary depending on the driving conditions and the load on the engine. For instance, when the engine is idling, the fuel pump voltage may be lower, and when the engine is under load or accelerating, the voltage may increase to deliver more fuel to the engine.
It's important to note that the voltage at the fuel pump may be different from the battery voltage or the alternator output voltage due to voltage drops in the wiring and connections. Factors such as wire resistance, length of the wire, and the number of connections can affect the voltage at the pump. In some cases, if the voltage drop is significant, it may be necessary to upgrade the wiring or use a larger gauge wire to minimize the voltage drop and ensure the pump receives sufficient voltage.
Additionally, it's worth mentioning that while increasing the voltage can increase pump speed and fuel delivery, it is crucial not to exceed the maximum voltage specifications of the fuel pump to avoid potential damage or malfunction.
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A voltmeter can be used to check the voltage at the tank connection
A voltmeter is a useful tool to check the voltage at the tank connection. It can be used to test electricity in batteries, appliances, and outlets.
To use a voltmeter, you will need to set it to measure voltage. If you are measuring direct current (DC) voltage, such as a battery, you will need to set the voltmeter to the correct range. Most voltmeters have a dial with a bunch of numbers, and you should set it to the next highest setting. For example, if you are testing a 12V battery, you should set the voltmeter to 20V. If your voltmeter doesn't have a dial, it is likely an autorange voltmeter, which will set the proper range automatically once you begin the test.
Once you have set the voltmeter to the correct range, you can plug the coloured probes into the slots. The red probe is the positive or hot wire, and it plugs into the port for the unit you are measuring. The black probe is the negative wire, and it plugs into the common port. You can then connect the probes to the tank connection, ensuring that you connect the red probe to the positive terminal and the black probe to the negative terminal.
It is important to note that you should always take precautions when working with electricity. Make sure to unplug any appliances or batteries before testing them. Additionally, never touch the metal tip of the voltmeter while testing with a live current, as you could get an electrical shock.
By following these steps, you can use a voltmeter to check the voltage at the tank connection and ensure that it is within the appropriate range.
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Frequently asked questions
The voltage going to the fuel tank should be around 12 volts.
The ideal voltage for a fuel pump is around 12 volts, with some variance depending on the vehicle.
You can check the voltage of your fuel pump with a voltmeter. Connect the black lead to a body ground and the red lead to each pin to test for 12V.
Voltage is important because it determines the speed of the electric motor, which in turn affects the amount of fuel moved by the pump.
Insufficient voltage can cause the fuel pump to turn on intermittently or not at all. This can lead to fuelling issues and affect the performance of the vehicle.
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