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Thanks for the reply. I asked about the 20B because
presumably you need about 50% more flow than I do with the 13B.
Like I said, doubt this is related to the problem I had
- sudden loss of fuel pressure at cruise and at altitude where the flow
requirements presumably pretty low. At least compared to takeoff flow
requirements.
Mike Wills
Sent: Wednesday, May 05, 2010 4:09 AM
Subject: [FlyRotary] Re: fuel filters
A little more detail on symptoms that led
you to change filters please? Was this for the 20B?
Yes, this was on
the 20B but it would apply to any installation. Symptoms were
mixture going lean at higher throttle settings. This was a slowly
progressive thing, not a sudden occurrence. Cause was dropping fuel
pressure due to clogged filter. When throttled back, fuel pressure
returned to normal and engine ran fine. This would of course get worse and
worse as the filter became more and more restrictive.
I don't
think this could happen suddenly unless you had a large amount of foreign matter
in the tank. It certainly can't cause the random intermittent miss that
Bill had which started this thread.
Tracy
On Tue, May 4, 2010 at 10:54 PM, Mike Wills <rv-4mike@cox.net>
wrote:
Tracy,
A little more detail on symptoms that led you to
change filters please? Was this for the 20B?
Although I'm not convinced that it was necessary, for
lack of a better answer I replaced my filters after my fuel starvation episode
a while back. I still have no smoking gun that I can point to as the cause of
this isolated incident. Keep waiting for the sudden unexplainable
re-occurrence. Hope when/if it happens I'm near something
landable.
Mike Wills
Sent: Tuesday, May 04, 2010 9:58 AM
Subject: [FlyRotary] Re: fuel filters
" Big fuel filters are essential, especially for those with
composite tanks." I second that. Just had to change out my
nice looking Jegs Billet aluminum filter (with a tiny screen disk filter
inside) for Peterson 600 series fuel filter. This is the filter
between tank and fuel pump, not the high pressure one after the
pumps. Tracy
On Tue, May 4, 2010 at 12:34 PM, John Slade <jslade@canardaviation.com> wrote:
For what it's worth, I've seen the symptoms of a partially
blocked filter and restricted fuel flow while airborne....The mixture creeps
toward lean, the EGT creeps up, fuel pressure is erratic and moving lower .
Tweak the mixture knob toward rich and everything is fine for 10 mins, then
the cycle begins again. Big fuel filters are essential, especially for those
with composite tanks.
Regards,
John
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