In December I flew my 110Fz and after the day was over I put after run oil in the engine ( the correct one from performance specialties). On the next outing a couple of weeks later the engine would not start and was not getting any fuel. I took apart the reg. and noticed that I had put to much ARO in because everything was gummed up. After flushing it out, the engine ran fine for the rest of the day although it was a little hard to start. At the end of the day I drained the tank and ran the engine dry and did not use ARO. Now approx. 3 months later the same starting problem happened. When this happens I noticed that when I relived the pressure from the tank there was very little. After many tries she fired up on her own and except for one other accurance she was fine for the rest of the day.