My question is, why would anyone want to risk it? The booster pumps are not that much compared to what could happen besides they reduced wear on the engine pumps and gives you a much better safety buffer.
I’ve been to FL250 with my 915 on 91 non oxy fuel with no issues and indicating 53 psi on only the main pump. Granted it’s a HW with a belly tank which feeds the 915. Not sure what psi would be considered low enough to worry about issues?
A high wing with a header tank will have less of an issue with this for sure since you have gravity acting on the system. The pressure before the main pump is what most will never see since nobody monitors this and there will never be an issue after the pump if it is being supplied with a good amount of non vaporized fuel. Not every flight will produce a problem since the proper conditions may not always be there but we have seen several situations where the engines have either run very poorly or stop all together.
@@MidwestPanelshmmm it’s always been 51-55psi at cruise power depending on altitude. 600 hours like that without issue. Wonder why? I just checked with others who have a 915 S21 like mine and they’re around 46psi which aligns with what Rotax says 42-46….
@@MidwestPanels I just spoke to Rans. My sensor is located at the fuel valve bypass block. Their newer installs have it on the pressure rail, where Rotax wants it. The kit for this mounting option wasn’t available when mine was built. Also, I have a Kavlico sensor, which I don’t believe compensates for MAP like the Rotax sensor. They say consistency is the most important thing and since my pressure never fluctuates that that’s my normal and not to worry🤷🏻♂️ Anyways I appreciate what you guys do for this category and the Rotax community and for pointing out my fuel pressure so I could educate myself better.
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My question is, why would anyone want to risk it? The booster pumps are not that much compared to what could happen besides they reduced wear on the engine pumps and gives you a much better safety buffer.
I’ve been to FL250 with my 915 on 91 non oxy fuel with no issues and indicating 53 psi on only the main pump. Granted it’s a HW with a belly tank which feeds the 915. Not sure what psi would be considered low enough to worry about issues?
A high wing with a header tank will have less of an issue with this for sure since you have gravity acting on the system. The pressure before the main pump is what most will never see since nobody monitors this and there will never be an issue after the pump if it is being supplied with a good amount of non vaporized fuel.
Not every flight will produce a problem since the proper conditions may not always be there but we have seen several situations where the engines have either run very poorly or stop all together.
53 PSI seems a bit high by the way, you might want to look into that.
@@MidwestPanelshmmm it’s always been 51-55psi at cruise power depending on altitude. 600 hours like that without issue. Wonder why? I just checked with others who have a 915 S21 like mine and they’re around 46psi which aligns with what Rotax says 42-46….
@@Captndarty Yes 46 sounds right. Do you have the sensor hooked up to the Manifold pressure port?
@@MidwestPanels I just spoke to Rans. My sensor is located at the fuel valve bypass block. Their newer installs have it on the pressure rail, where Rotax wants it. The kit for this mounting option wasn’t available when mine was built. Also, I have a Kavlico sensor, which I don’t believe compensates for MAP like the Rotax sensor. They say consistency is the most important thing and since my pressure never fluctuates that that’s my normal and not to worry🤷🏻♂️ Anyways I appreciate what you guys do for this category and the Rotax community and for pointing out my fuel pressure so I could educate myself better.