I don't think that has any bearing on it mike. Both pumps on my Cub are gear pumps (IO-360-B1D). I think the differences has to do with the relationship of the fuel tank to the engine pump. In the airplane that my engine came from the engine was about 6 feet vertically above the fuel tank with a 10-12 foot long fuel line. On hot days when idling for long periods it would surge, run rough and sometimes quit. Turning on the boost pump which was mounted on top of the gas tank pressurized the fuel line to the engine pump inlet. This indicated that the ability of the engine pump to draw at that height and at low rpm was limited.engine pump is a diaphragm pump...
electric is a rotary pump, thats probably where the vapor difference/issue is?????
As long as you keep the mixture in idle cut off there will be no fuel flow to the injectors, therefor no flooding. You will just have a clean charge of fuel standing by at the mixture valve ready to go.Stupid question alert.
So, if preparing for a hot start, can you have mixture off, throttle off, and run the pumps to clear the lines and cool the fuel. Would you risk flooding the system by building more pressure before the start?
I don't think that has any bearing on it mike...
I agree with you mike, It just appears and acts as though air gets in the line between the tank and engine. The weight of the fuel and an idling pump just can't draw that height very well. As you know pumps can push a liquid a lot higher than they can draw it.not sure how this diaphragm pump works, if it has a SUCK half of stroke, then a push...
but to separate air from a liquid you put it in a vacuum..... it bubbles to the surface... that what I do when degassing rubber to pour into a mold.....
I found this to be true as well. Of course the pilot can always manage to make it happen. The Pmags make it nearly bullet proof.A good friend with cause to know says electronic ignitions make hot starts/flooded starts a non issue.
I found this to be true as well. Of course the pilot can always manage to make it happen. The Pmags make it nearly bullet proof.