I did not think this engine had a throttle pump?
It certainly does not have a carburetor.
Would there be a difference in elec pump output, maybe putting more fuel in one engine than planned? It seems to be the right engine on both of our airplanes that fail to start most.
I want to have a procedure that all the pilots can use, and the one we use now is not fool proof.
The pilots start the engines as soon as the airplane is pulled out from the hangar, but the hangar is not very warm. The engines seem warm enough but we don't wait too long before starting them, then we warm them up to about 50 deg oil temp and shut down to refuel. Finally load the passengers and start again with the engines still warm.
Normally works just fine but occasionally it does not and then the pilot gets the hot seat because it is assumed that it is operator error and so far I have not been able to find a reason why this is not so.
The passengers are not impressed either, even if the OAT is below -20C and the wind is 20 knots right down the throat of the engine.
Some of the most experienced pilots fail to get a good start sometimes, and if the throttle/mixture is not just right, there is also a period after start before the engine finds its rhythm.
Not a big deal in the greater scheme of things but it causes grief.