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Fuel pump adjustment

After the turbine has ignited on propane, the starter motor further accelerates the

turbine. At approx. 5000 RPM, the fuel pump is automatically started at minimum power

by the ECU. Beginning from this first pump start voltage, the fuel flow is then slowly

increased by increasing the pump voltage.

The initial pump voltage that the pump is supplied immediately after ignition has been

factory adjusted. If the fuel pump is changed or after several turbine runs the pump is

breaking in thus delivering too much fuel at start-up causing long flames behind the

turbine exhaust, it might be necessary to readjust the pump start voltage.

For adjustment of the pump start voltage, the ECU incorporates a special adjustment

function, which can be accessed as follows:

Interrupt fuel supply to the turbine. If the fuel supply to the turbine is not disconnected /

interrupted the turbine can be “filled” with fuel during the following adjustment

procedure!!! Æ Danger of a “Hot Start”

Switch off ECU and plug in GSU (RC transmitter is not being used)

Press

and hold the key “Change Value/Item” on the GSU and switch on the ECU

Release the “Change Value/Item” when the display of the GSU shows the following:

Pump start volt.

Uaccelr1:

By pressing the “Run” key will run the pump at the current start voltage value.

To increase the pump start voltage by one increment, press the ►+ key.

To decrease the pump start voltage by one increment, press the ◄ - key.

The pump start voltage should now be adjusted in such a manner, that the pump just

begins to steadily turn and that the fuel is delivered in a thin fuel stream (a little bit more

than just dripping out of the tubing). To test this, press the “Run” key several times to

check that the pump starts steadily running on different pump rotor positions.

Normal values for the pump start voltage are between 0.100 and 0.325V.

Important:

At the end of the adjustment procedure press the “Manual” key to store the new setting

and resume to normal operation.

JetCat SPH5 User Manual

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