Originally Posted by
Backpacker
I have a Rotax 912 UL and when i rigged in my fuel pressure dial guage I installed the Rotax return flow orifice(I never had it when i first got my Chinook) and I installed a filter before the orifice to prevent stuff getting to the orifice...been a long time but i i had some low fuel pressure sometimes and remember one time finding something partially blocking the return orifice(I think it was after that i installed a filter before the orifice...the orifice hole is small...so if a chunk of something was sitting near the orifice it may not block flow until full power when it could get swept up and partially block the orifice...something worth checking...but depends where the supply for the pressure reading is from. When i first got my Chinook it never even had a return orifice, only a return line and never had a fuel pressure guage then either but had no issues.