Katerina Swanson
Smart Craft Gauges are used to monitor fuel and oil tank levels. They can be calibrated by filling the tank and then checking the calibration in the smart craft menu, adjusting the sending unit accordingly if the gauge shows anything other than full. The fuel gauge wires go from the sender to the harness plug on the engine, and the correct wires must be used to avoid issues such as incorrect readings or damage to the PCM. The Smart Craft boat harness must be installed to register fuel tank levels.
| Characteristics | Values |
|---|---|
| Fuel gauge problem | Fuel gauge reading low fuel when the tank is not empty |
| Fuel tank calibration | Fill the tank, check the calibration, and calibrate the sending unit if the gauge shows anything other than full |
| Fuel tank calibration steps | Confirm the last quarter (1/1 full) |
| Fuel tank sensor | Black --> purple/black, Blue --> black (ground) |
| Smart Craft boat harness | Connects to the fuel and oil tank to the SC system |
| Fuel gauge wires | Go from the sender to the 8-pin harness plug on the engine |
| Fuel sender | Wema fuel sender |
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What You'll Learn
Calibration of fuel tank levels
Understanding Calibration:
Calibration is the process of determining the exact volume of fuel in a tank corresponding to specific measurement values. It involves configuring the fuel gauge or sensor to provide precise readings of the fuel level, which is then converted into fuel volume based on the known shape of the tank.
Sensor Calibration:
Before calibrating the fuel tank, it is essential to ensure that the fuel level sensor or sending unit is functioning correctly. Sensor calibration involves adjusting the sensor to its new length after cutting or extending. This is achieved by immersing the sensor in fuel at 0% (empty) and 100% (full) levels, allowing the sensor to learn its new "empty" and "full" calibration points.
Tank Calibration Procedures:
There are several methods for calibrating fuel tank levels:
- Calibration Table Based on Tank Dimensions: This method uses a calibration table generated from the tank's dimensions, particularly for horizontal cylinder tanks. While it provides a basic calibration, it does not account for shape defects and other elements that may impact volume and calibration accuracy.
- Three-Dimensional Model Calibration: This approach is used when higher accuracy is required. It involves creating a 3D model of the tank based on its dimensions and inclination, allowing for more precise volume calculations.
- Calibration by Fillings: This time-consuming method involves filling the tank with small portions of fuel while recording the sensor output at each level. This data is then used to establish a formula to convert fuel level readings into fuel volume.
- Flow Meter Calibration: This procedure measures the flow rate in litres per minute, ensuring the accuracy of the pumping unit. By measuring the litres filtered through in one minute, you can confirm the correct flow rate for the pump.
Additional Considerations:
- Fuel Gauge Calibration: When dealing with smart craft fuel gauges, it is essential to calibrate them with a full tank of fuel. If the gauge does not show "full" after filling the tank, adjust the sending unit accordingly via the calibration menu.
- Sender Compatibility: Ensure that the sender units are compatible with the fuel gauge system. Older sender units may not provide accurate readings with newer gauge systems.
- Fuel Flow Computers: In aircraft, for example, pilots often rely on fuel flow computers or fuel flow sensors rather than fuel gauges due to their higher accuracy.
In summary, accurate calibration of fuel tank levels involves a combination of sensor calibration, tank calibration using various methods, and ensuring compatibility between fuel gauges and sender units. By following these steps and considerations, you can achieve precise fuel level measurements and make informed decisions regarding fuel usage and management.
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Fuel gauge troubleshooting
If your SmartCraft fuel gauge is reading low fuel when you know there is fuel in the tank, there are a few troubleshooting steps you can take. First, check if the fuel tank is a 30-gallon tank; if it is and it's half-full, then a low-fuel reading is to be expected. On most boats, the fuel tank pickup sits about half an inch to an inch off the bottom of the fuel tank, so you won't be able to use every last drop of fuel. As a result, fuel gauges are often imprecise. When the gauge reads empty, you usually still have some usable fuel left.
If your tank is not a 30-gallon tank, or if you want to improve the accuracy of your gauge, you can try calibrating it. To do this, fill the tank completely and then check the gauge. If it shows anything other than full, go into the calibration menu on the SmartCraft and adjust the sending unit accordingly.
If calibrating the gauge does not solve the issue, you may need to replace the sending unit in the gas tank.
If your SmartCraft gauge is reading a “Fuel fault” after adding gas, you can try hitting the plus and minus buttons on the gauge to bring up a code number. This code may provide more information about the issue.
For further troubleshooting, it is recommended to consult a certified marine technician or a mechanic with experience in boat repairs.
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Fuel sender compatibility
Smart Craft gauges are designed to work with a wide range of traditional fuel senders. However, it is imperative to ensure that the original "PINK" wire is completely disconnected from the sender and isolated to prevent any electrical issues. In addition, the orange/black wire in the plug should not be used as a ground wire for the fuel tank, unless the fuel tank is made of plastic.
When selecting a fuel sender, it is recommended to choose one that outputs 33 Ohms when full and 240 Ohms when empty, or a voltage representative of that resistance range. Senders that have been known to work well with Smart Craft gauges include WEMA, Royce, ISSPRO, and Moeller Digital. It is important to avoid using float arm-type senders as they are designed for analog systems.
In some cases, fuel senders may need to be calibrated to ensure accurate readings. This can be done by filling the fuel tank completely and then calibrating the sender accordingly if the fuel gauge shows anything other than full. It is also important to check the tank size and ensure that it is set up correctly in the system.
Additionally, it is worth noting that some issues with fuel gauge readings may be caused by factors other than the fuel sender, such as a bad harness at the gauge or a faulty sending unit. Troubleshooting these issues may involve seeking assistance from marine mechanics or technicians with experience in Smart Craft gauge systems.
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Fuel tank sensor wiring
When dealing with smart craft gauges, it's essential to understand the calibration process. One user mentions that they have a pink wire with a black strip already connected to the tank. To use the smart gauge, they must calibrate the sender to the gauge by inputting the number of gallons the tank can hold. This is done through the fuel gauge section on the speedo smart gauge. The user then adds a quarter tank of fuel at a time, calibrating at each increment until the tank is full.
Another user with a Smart Craft Speed Gauge mentions that calibrating with an empty tank can lead to inaccurate readings. If the tank is filled after calibration, the gauge will show a full reading before the tank is actually full. This can be frustrating and costly, as users may be hesitant to add more fuel until the issue is resolved.
In terms of specific wiring colours, one source outlines the following for a BMW K75RT:
- Fuel Pump Positive: Green (outside the tank) to Yellow (inside the tank)
- Chassis Ground: Brown (outside) to Black (inside)
- Low Fuel Light: White (outside) to Blue (inside)
- Signal for Fuel Gauge: Yellow (outside) to Blue (inside)
It's important to note that the wire colours may change inside the tank, as mentioned by the source.
Additionally, for a BMW K-bike, a user suggests testing the wiring between the plug and the pump with a multimeter. They provide the following steps:
- Test the wiring with the multimeter: Green (outside) to Yellow (inside) and Brown (outside) to Black (inside).
- Run a jumper from the black wire side of the pump to the ground lead bolt on the transmission.
- Remove the pump and conduct a bench test.
For a Chevrolet truck, a user is replacing the fuel cell with a stock tank and needs to wire in the pigtail for the sensor. They are looking for grey/black, green, and orange/black wires for the 3-wire pigtail.
By following these steps and understanding the wiring specifics, users can effectively program smart craft gauges for fuel tank selection, ensuring accurate fuel level readings and optimal vehicle performance.
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Fuel gauge selection
First, ensure you have the correct hardware. You will need a Smart Craft boat harness installed, connecting the fuel and oil tank to the Smart Craft system. The harness connects between the engine and the fuel tank, and without it, calibration is not possible. You will also need to ensure you have the correct fuel sender for your setup. For example, some installations use the 'American standard' while others use the 'European standard'.
Once the hardware is in place, you can begin calibration. It is important to calibrate with a full tank of fuel. Enter the calibration mode on the Smart Craft gauge and input the number of gallons your tank can hold. Then, add fuel in increments, such as quarters, and calibrate at each increment until the tank is full.
It is important to note that you should not use an analog gauge at the same time as the Smart Craft gauge, as this can cause issues. Additionally, be mindful of the wiring colours and connections, as incorrect wiring can lead to inaccurate readings or damage to the system.
If you encounter issues, such as low fuel readings when the tank is known to be fuller, you may need to troubleshoot. This could involve checking the wiring, replacing the fuel sender, or seeking assistance from a marine technician.
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Frequently asked questions
To calibrate your Smart Craft fuel gauge, first fill up your fuel tank. If the gauge shows anything other than full, go into the calibration menu on the smart craft and calibrate the sending unit accordingly.
Check the calibration with the fuel tank completely full. Fill the tank up, and then if the fuel gauge shows anything other than full, calibrate the sending unit.
Check the wiring and replace any shorts. Reset the gauges and make sure the tank size is correct.
Wema fuel senders seem to work the best.
