RON-P Posted September 27, 2023 Report Share Posted September 27, 2023 After landing and shutting off auxiliary fuel pump, the engine stopped immediately. How do I check to make sure main fuel is the problem and not an electrical issue of some kind. Any help would be greatly appreciated. Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted September 28, 2023 Report Share Posted September 28, 2023 The pump pack is located in the pilot's baggage area. You could remove the cover, unplug the pump pack, and apply a 12v power source to each pump individually to see if they run. I just had one apart to replace the rubber connections in it. Quote Link to comment Share on other sites More sharing options...
Madhatter Posted September 28, 2023 Report Share Posted September 28, 2023 I don't work on an IS engine and don't pretend to be knowledgeable with it. I guess I am uncomfortable with the fact that the engine is 100% dependent on two electrically driven fuel pumps, just not something I'm used to. I'm used to dealing with engines with one mechanical driven fuel pump and one electrically driven fuel pump, lycoming, continental, wright, p&w, etc. I wonder how the reliability is on a lot of these engines as they accumulate a lot of hours. Just me Quote Link to comment Share on other sites More sharing options...
FlyingMonkey Posted September 28, 2023 Report Share Posted September 28, 2023 4 minutes ago, Madhatter said: I don't work on an IS engine and don't pretend to be knowledgeable with it. I guess I am uncomfortable with the fact that the engine is 100% dependent on two electrically driven fuel pumps, just not something I'm used to. I'm used to dealing with engines with one mechanical driven fuel pump and one electrically driven fuel pump, lycoming, continental, wright, p&w, etc. I wonder how the reliability is on a lot of these engines as they accumulate a lot of hours. Just me I always assumed the iS has a mechanical pump and an electric pump. If they are both electric that seems a little weird. I know they have two separate electrical systems to make sure the injectors keep working, but I'd be happier with at least one mechanical pump. Quote Link to comment Share on other sites More sharing options...
Bill3558 Posted September 28, 2023 Report Share Posted September 28, 2023 Maybe the 40lb psi required for fuel injection is not doable with engine driven mechanical pump like the 912uls. Quote Link to comment Share on other sites More sharing options...
Madhatter Posted September 29, 2023 Report Share Posted September 29, 2023 40psi is not a problem on mechanically driven pumps. IO540 runs 45 max at injectors. Quote Link to comment Share on other sites More sharing options...
shiny.ice Posted October 13, 2023 Report Share Posted October 13, 2023 On 9/28/2023 at 9:43 AM, FlyingMonkey said: I always assumed the iS has a mechanical pump and an electric pump. If they are both electric that seems a little weird. I know they have two separate electrical systems to make sure the injectors keep working, but I'd be happier with at least one mechanical pump. At least on my CTLS, you can hear the main (electric) pump right before the starter engages. It's typical that the 912iS has two electric pumps. Sure, it won't run if you don't have electrical, but the iS itself won't run without electrical either. Quote Link to comment Share on other sites More sharing options...
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