Hi! Remi
You don't say which "Bob" you are addressing ..however if it is me ..I have
two mini gascolators one on each tank connector both prior to the fuel
switch. They are not in series as such but independently filter the main
and reserve supply lines.
I have not been able to establish how the crud was introduced after the
gascolators to get as far as the pump filters ..yet! but without the pump
filters it would now be in the carbs! And "God forbid"! that should happen.
I always use a gauze filter in the tank main filler, nothing ever shows. I
am considering getting a "Mr Funnel" but that wouldn't exclude crud which
has somehow entered the pump filters after the fuel passed the two
gascolators. IMHO it can only have been inside pipes fitted during rework
after the Jabiru was changed for a 914 Rotax.
Regards
Bob Harrison G-PTAG
_____
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Remi Guerner
Sent: 11 October 2009 12:38
Subject: Europa-List: Fuel Pumps Rotax 914 System.(Pierburg )
Bob,
In my opinion having two filters in serie is unnecessary and may even be
dangerous:
If the mesh size of the pump filter is equal or bigger than the one of your
main filter or gascolator located upstream, then it is useless, unless some
bad stuff is introduced in the hose in between during installation or
maintenance.
If the mesh size of the pump filter is smaller than the one of your main
filter or gascolator, then it can become clogged by particles not blocked by
the main filter. This can happen very quickly as the filtering area of the
Pierburg pump filter is very small. Moreover, there is no way to visually
check that pump filter, other than disconnecting the hose and removing the
filter element with the risk of damaging it as you did.
My advice is to get rid of the pump filters and take all precautions during
fuel system installation and maintenance so that no pollution is introduced
downstream of the main filters or gascolators.
Additionnally here is some information I found on mesh sizes:
Andair gascolator GAS 375: 70 micrometers (source: Andair catalog)
Pierburg electrical fuel pump: no indication on mesh size of the included
filter; however they recommand the use of a 60 micrometer mesh filter
upstream the pump. (source: Pierburg fuel pumps mounting instructions)
Europa supplied in line filters: anybody knows?
Regards
Remi Guerner
<<<<<I have managed to very slightly damage the "thimble" filter at the
inlet
side of one of my pumps. That was a real bum thing to do but to heap further
"coals of fire" on my head I find that they are not a spares listed part and
no one not even Rotax or Peirburg the pump manufacturer will supply a
replacement.
It is therefore necessary to buy a new pump ! What a con. if I ever heard of
one.>>>>>>
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