birddog486
Well Known Member
I'm curious if all the RSA and Avstar fuel systems that dont have fuel returns have fuel vapor issues when doing hot starts on hot days.
I normally fly to another local airport for avgas and depart within 15min. and it never fails to boil if it's above 80 degrees.
It always starts but the rough idle and shaking below 1200 RPM is a bit annoying, It doesn't seem to make a difference full rich or leaned, fuel pump on or not and, I've waited 5+ minutes a few times to see if it clears up with no luck so I try to get to the runway fairly quick, once full power is in it clears up immediately.
I've reduced the injector size and increased the spring pressure in the manifold Per Airflow Performance, both with only slight improvement.
All lines FWF are fire sleeved and I'm considering adding a shroud to the fuel pump next.
Any thoughts on the issue
I normally fly to another local airport for avgas and depart within 15min. and it never fails to boil if it's above 80 degrees.
It always starts but the rough idle and shaking below 1200 RPM is a bit annoying, It doesn't seem to make a difference full rich or leaned, fuel pump on or not and, I've waited 5+ minutes a few times to see if it clears up with no luck so I try to get to the runway fairly quick, once full power is in it clears up immediately.
I've reduced the injector size and increased the spring pressure in the manifold Per Airflow Performance, both with only slight improvement.
All lines FWF are fire sleeved and I'm considering adding a shroud to the fuel pump next.
Any thoughts on the issue