Hi Frans,
We have the same system as you have, the series pumps with check valves as
specified
by Rotax. We feed one pump from a Andar gasolator and the other thru a
Purolator filter, the one Europa supplied.
Never a problem like you describe in 400 hours. This summer we have been
operating
a lot at density altitudes of 12,000 to 18,000 ft using MOGAS with no problem.
Did a trip to Colorado in June and again no problem with MOGAS at 16,000
ft density altitude. In fact, there is a flight school in Colorado Springs
with Flight Design aircraft (912ULS) using exclusively MOGAS. Colorado Springs
is 6000 ft MSL.
So we're pretty confident the problem is not MOGAS.
Jim & Heather
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