It appears whatever is plugging the filters is not the conventional sort
of debris and furthermore is a similar color to the filter media thus
making it difficult to determine whether contamination exists. This
suggests a couple of remedies.
One is to replace filters on a strict time basis such as Jeff reported
with Baby Blue. Discard at 1 hr, 5hr, 25hr, and every 50hr
thereafter-perhaps at every oil change. The bothersome thing is they
can be clogged with no visual evidence apparent.
In addition, a fuel suction gauge fitted between the filter and
electric pump will give an indication of filter restriction long before
it is apparent on the fuel pressure gauge.
Creighton Smith
Europa Classic
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