What the function controls
Dual Fuel Tank Transfer moves fuel from a secondary tank into the primary one. On the output side it can drive a transfer pump, a transfer control solenoid and a dash light that shows when a transfer is running. On the input side it can read the main tank level, the secondary tank level and a request switch the driver uses to ask for a transfer.
Wiring and options
| Option | Choices | Our advice |
|---|---|---|
| Transfer Request Mode | "Transfer While Active" runs only while the button is held. "Press Start/Stop to Transfer" starts on one press and stops on the next | Latching start/stop is nicer to live with, as long as the stop limits below are set |
| Main Tank Full Source | None, Switch Input, or Fuel Level Sensor | A level sensor gives you an adjustable stop point. A float switch is simpler |
| Secondary Tank Empty Source | Switch Input if you have an empty switch | Worth fitting so the pump is not run dry |
| Transfer Status Light Enable | Adds a light output that comes on during transfer | Recommended so the driver knows it is working |
| Transfer Control Solenoid Enable | Adds a solenoid output for systems that use one | Only if your plumbing has a transfer solenoid |
Then assign the physical pins in Connections. If you use a level sensor for the main tank, set up and calibrate it first. Our fuel level sensor calibration article walks through that.
Transfer limits
- Main Tank Stop Level: only appears when the main tank source is a fuel level sensor. The transfer ends when the main tank reaches this level.
- Max Transfer Time Enable / Max Transfer Time: a time cap. Once a transfer has run this long, it switches off.
- Max Vehicle Speed Enable / Max Vehicle Speed: needs a vehicle speed input. Above the set speed, an active transfer stops.
Even with a level sensor, we enable the maximum transfer time. If a sender fails or a switch sticks, the timer is what stops the pump running indefinitely. Size it a little longer than a full transfer takes on your truck.
Quick checks
With the engine off, trigger a transfer and confirm the pump, solenoid and light all switch on. Then prove each stop condition works: tank level, timer and, on a test drive, speed. Running an Elite instead? See the Elite version of this function, or ask us about your setup.
