Haltech F10 - Manual (Page 85)

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Run Time
The auxiliary fuel pump will switch on if the engine exceeds the engine speed and/or
the load bar set above. It will then stay on, even after speed and load have dropped
below their respective limits, for a period of time specified by Run Time. A minimum
Run Time of 5 seconds is permitted.
The Auxiliary Fuel Pump will prime with the main fuel pump, but will only run if the engine
condition exceeds either limit. Since there may be a short delay from the time the fuel pump is
switched on to the time the extra fuel becomes available, the Load Bar and Engine Speed
settings above should be set below when that extra fuel is actually needed. The use of a good
quality check valve and fuel pump will reduce the delay time by maintaining pressure in the
secondary line. Nevertheless, the extra fuel will not be instantly available and care should
taken when deciding the switch times. If these values are set too high, the engine may be
momentarily starved of fuel when there is a sudden fuel demand.
Figure 16.9. Example circuit for Auxiliary Fuel Pump.
16.10 Anti-Stall Solenoid Control (AS)
A solenoid air valve in the manifold may be used to allow extra air into the engine during
cranking or extremely low rpm. This can aid in starting the engine, or in preventing it from
stalling if engine revs drop too low.
To use this function, you will need the following:
- a suitable solenoid air valve mounted to the manifold;
- F10 programming software and cable.
If the solenoid air valve is too large, the engine may stall because of its opening. The valve
should be of appropriate size to increase the idle speed by several hundred rpm. Wire the
solenoid through the output connector. Run the F10 programming software in ONLINE mode
and select the Anti-Stall function on the appropriate output.
There is only one parameter to be set with this function. That is the rpm below which the
valve will be opened. The default setting for this parameter is 500rpm.