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I have not followed this thread very closely, so if I'm
way off base, please smile and delete my post.
I believe in the following relative to a TSIO550
engine:
1. A fuel filter between the electric fuel pump and the
engine pump is a good idea. I have one and it has a pressure relief valve
in it. As previously posted, high pressure pumps push a lot better than they
suck, so my filter is downstream of the electric pump and still provides
protection for the engine driven fuel pump and fuel nozzles.
2. A gascolator is good for one thing and that is
causing vapor lock on hot starts. Particles that do not have there own zip
code are passed through. In 20 plus years I have never seen water come out
of a gascolator. The gascolator in the Bonanza I fly, until the IV-P
is complete, is not even visible let alone drainable. Drainage is done at
annual. I can't possibly see how that device prevents a slug of water
from going through to the engine.
3. I opted for a shrouded and scat tube cooled filter
and no gascolator.
4. I religiously drain fuel from the tanks and check
for particles, water and color. When a truck pulls up to fuel my plane I
look for 100LL painted on the side. I have spent an hour shaking the wings
on a Mooney trying to get all the fuel samples to check
clear.
Just to baseline how crazy I am and seal the fact that
nothing I say should be taken seriously.....I don't believe pulling 5 inches of
manifold pressure on decent is going to "shock cool" the TSIO 550
engine.
Craig Berland
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