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Rotax 912iS: low fuel pressure warning

Karl Kistler

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Patron
RV12iS, before engine start, fuel pressure with one elec pump 3 bar, with two elec pumps 3.1 bar. After engine start: fuel pressure with two pumps 2.8 bar, with one pump 2.7 bar and the ?low fuel pressure? warning comes on.
Engine running smooth.
Then, when increasing rpm above about 3000rpm, fuel pressure comes back to normal, 3 bar.
Whats wrong here? Or is this kind of a normal behavour?
 
After increasing RPM to 3000 what happens when you go back down to 2000 RPM. Does the fuel pressure stay normal or does the "low fuel pressure" warning come back on?
 
Is your bus voltage fluctuating with rpm? More than likely the voltage is low and when you increase rpm the voltage rises which increases speed of the pump. This type pump is voltage sensitive.
 
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Nice to see you got the problem solved over there.

Hope you have a great first flight! :)
 
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