Higher pressure electric fuel pump cause carb leak?
My original electric fuel pump died, ES40105. Contact with Van's gave me the impression that I had no choice but to replace it with the 1.5 psi higher pressure ES40135, so I did (Van's no longer stocks ES40105). I installed it and immediately had the right carb overflow during pump testing. 861189 floats are not heavy despite 3+ years in service.
I had a certified Rotax technician inspect both carbs and replace floats, needle valves, and float bowl gaskets. He reinstalled the carbs today and during carb sync both carbs overflowed out the float bowl vents. Fuel pressure was around 7 psi, which is in the green in the revised range markings that go with the higher pressure pump. Clearly, my carbs will not tolerate the higher fuel pressure. Builder support suggested going back to the 40105 pump which is readily available, just not from Van's.
Has anyone else had similar experience and have insight into how to fix it?
RV-12 #120768, first flight Sept. 2016
424 hrs as of 2/27/2023