Rich Posted July 11, 2013 Report Share Posted July 11, 2013 Good morning--------Does anyone know how long it takes for the aux fuel pump to return a 912 back to operating RPM after a main pump failure?------------Also, does anyone know why my enter key will not work on this forum? That's the reason for the dashed lines, I cannot separate paragraphs. It worked a week ago------------Rich Link to comment Share on other sites More sharing options...
Roger Lee Posted July 11, 2013 Report Share Posted July 11, 2013 The aux fuel; pump should give you almost instant rpm increase. It might lag a second, but should be right there. It takes very little pressure for the 912 to run so even before the pump would hit its max pressure rpm would already have returned. The return button function issue is on your computer. Link to comment Share on other sites More sharing options...
FlyingMonkey Posted July 11, 2013 Report Share Posted July 11, 2013 Rich try the enter keypad on your numeric key to the right until you get the problem fixed, that might work for you. Link to comment Share on other sites More sharing options...
Rich Posted July 11, 2013 Author Report Share Posted July 11, 2013 Roger,----------Thanks for the info on the pump.------------I had the computer checked and tuned up yesterday but the problem is still there.-----------Andy, no numeric key pad on my computer. I'll give another call to try and get it resolved.--------------Rich Link to comment Share on other sites More sharing options...
chanik Posted July 11, 2013 Report Share Posted July 11, 2013 Toggle the small switch-box in the upper left of your edit post box Link to comment Share on other sites More sharing options...
Rich Posted July 12, 2013 Author Report Share Posted July 12, 2013 Kurt, Thank you. That did the trick. Rich Link to comment Share on other sites More sharing options...
FastEddieB Posted July 12, 2013 Report Share Posted July 12, 2013 Back on point... ...I do not know the exact time interval between the engine stopping from lack of fuel until engine restart with the application of the boost pump. But there will be some finite time interval. Why? The boost pump needs to both fill empty fuel lines, and then to fill both float bowls, or at least get enough fuel in them to provide a usable fuel/air mixture to the engine. My guess is a few seconds, or possibly more. One important thing to remember is a geared engine like the ROTAX is more likely to simply stop when deprived fuel or spark than a more conventional engine. Those are more likely to windmill, ready to start back up as soon as fuel or spark is renewed. So don't forget about the possible need to utilize the starter in a ROTAX to get things going again. It may seem obvious if you're looking at a stopped prop*, but under stress it's very easy to overlook the obvious. *In my Sky Arrow (pusher configuration) I can't see the prop, so I might have little clue (other than maybe some instrument indications) whether my prop was stopped or windmilling. Link to comment Share on other sites More sharing options...
Rich Posted July 12, 2013 Author Report Share Posted July 12, 2013 Ed, Good point. A small check list kept very handy would be an excellent idea, other than the POH, for those possible stressful situations. Rich Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.