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.
Fuel flow rate increased normally from idle cutoff
to approx 80 percent of mixture-lever range of motion where fuel flow is at maximum.
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.
Once the engine is running, you advance the mixture control from the idle cutoff position and set the throttle for 1000 RPM.
The mixture control was in the idle cutoff
You go through the drill, verify, feather and pull its mixture to idle cutoff
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.
However, if you're not quick enough on the draw--either due to sweaty fingers, a damaged key or worn switch--and the engine quits before you can turn the key back to Both, just leave it in that position, let the engine wind down and secure it 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.