Move the mixture control toward idle cutoff
and monitor the tachometer.
The proper way of dealing with an induction system fire is to continue cranking the engine, pulling the flames and fuel vapor back into the engine where it belongs, while the mixture control is moved to the idle cutoff
position and the fuel selector is turned off.
During start, the mixture control is left at idle cutoff while iStart adjusts the fuel delivery through its fuel lines.
We do not recommend the technique of intentionally flooding the engine by running the boost pump with the throttle wide open and the mixture rich and then attempting a start with the mixture at idle cutoff while moving the throttle slowly until the correct mixture is reached, and enrichening the mixture when the engine fires.
Once on the ground, the power goes to idle, the mixture is pulled to idle cutoff
and the master is turned off while the pitch control is held full aft.
When using the iStart, the throttle is cracked, the mixture control is always in idle cutoff
and the system has to be energized with a panel-mounted master switch.
On this installation, the "fuel mixture cam profile was erroneous." Fuel flow rate increased normally from idle cutoff
to approx 80 percent of mixture-lever range of motion where fuel flow is at maximum.
The mixture control was in the idle cutoff
While the left mixture control was at idle cutoff
the left fuel selector was set to the left main tank and the aux fuel pump switch was positioned to "on," which would have caused fuel to continue flowing through the cracked line.
During the runup, if the mag switch is inadvertently switched "Off," we would opt to leave it there, pull the mixture to idle cutoff
and let the engine come to a stop.
But how could the engine start if I'd shut it down by pulling the mixture to idle cutoff
Even with a small amount of fuel vapor in the cylinder, and the mixture in idle cutoff
, severe injury or death can result when a propeller starts inadvertently this way.