CopterJohn
Active Member
I've seen this issue posted other locations, but never heard of any solutions.
On extended, full tank 120kt climbouts to 9-11kft, the fuel pressure bleeds down from 24 to around 8 psi unless the boost pump is left on. Of course, the AFS "check fuel pressure" alarm goes off. Engine continues to run fine, but turning boost pump on returns pressure to normal values. Previous owner dealt with this and changed out pumps, which obviously was not a solution.
I've heard theories of venting issues with the tanks, vaporization near the pump, etc. Has anyone else successfully dealt with this? Lines are firesleeved but no additional cooling on fuel pump.
On extended, full tank 120kt climbouts to 9-11kft, the fuel pressure bleeds down from 24 to around 8 psi unless the boost pump is left on. Of course, the AFS "check fuel pressure" alarm goes off. Engine continues to run fine, but turning boost pump on returns pressure to normal values. Previous owner dealt with this and changed out pumps, which obviously was not a solution.
I've heard theories of venting issues with the tanks, vaporization near the pump, etc. Has anyone else successfully dealt with this? Lines are firesleeved but no additional cooling on fuel pump.