I am with Steve Ivell - now where near enough information on which to base a
hypothesis.
All fuel degrade over time - how long had this fuel been sitting in the
aircrafts
vented tank.
Was fresh fuel added to old ? and if so in what sort of ratio?
I recently witnessed a Europa (912 ULS) that had not been flown for 3 years BUT
had been regularly taxied, run rough on start up, followed by a shut down and
failed attempts to restart. Investigation revealed dark orange fuel that if
fresh
should have been almost colorless/ to very light yellow. Draining the dark
fuel, replacing with fresh, emptying the float chambers and flushing the fuel
lined with fresh fuel completely changed the engines performance. Instant start
and smooth running. Aircraft the taken for its first circuits in 3 years without
any difficulty.
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