Excessive Fuel Pressure.
The fuel pressure on my 912ULS is still redlining on the high side and I cannot determine why. I eliminated the return line as a problem - the orifice is clear and fuel returns unimpeded. I know that red line is Rotax acceptable, but it is not normal system behaviour, especially as it also used to remain stable at mid range.. Any troubleshoots or ideas why a fuel system would suddenly run at high pressure gratefully accepted. Rgds Mike.