Today's Message Index:
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1. 05:11 AM - Chat Room Reminder (George Race)
2. 06:43 AM - Re: Fuel Systems (n85ae)
3. 06:48 AM - Re: Re: Anti Vapour Lock Fuel System (carl)
4. 07:31 AM - Re: Anti Vapour Lock Fuel System (n85ae)
5. 07:52 AM - Re: Corrosion Protection (n85ae)
Message 1
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| Subject: | Chat Room Reminder |
Please join us for our Monday evening chat room starting around 8:00 PM
Eastern Time.
<http://www.mykitairplane.com/chat/> http://www.mykitairplane.com/chat/
George
CH-701 Registered as N73EX
Do Not Archive
Message 2
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| Subject: | Re: Fuel Systems |
In general you should vent the header to a tank, if you don't and you
get a pressure differential across the vents between the tank and the
header, you can end up feeding fuel out the lower pressure vent.
This is not very likely, but it is possible. Also if you don't vent the
header you can develop an enormous bubble in the header which
simply will not go away so you definitely should vent the header.
Jeff
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=188096#188096
Message 3
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| Subject: | Re: Anti Vapour Lock Fuel System |
Ralf.
A very good question. To be honest I personally prefer my previous parallel
system. I like the redundancy especially of pump and filter.
Apart from the bypass and check valve I consider the new one a series
system. One can argue the check valve only complicates things for little
benefits.
As you have noted, the bypass around the boost pump is primarily to defeat
the unlikely failure of the boost pump blocking the line. It also adds an
alternate path around that pump to facilitate flow.
Assuming check valve failure modes of either open or closed, open nullifies
the boost pump but engine pump pressure continues at 4.5 lbs; closed, boost
pump operation remains normal and pressure should increase to 5 lbs when it
is selected ON. When selected OFF at high power settings I suspect pressure
will fall below 4.5 lbs because greater restriction through the boost pump.
Either requires a double failure to affect engine operation.
I am concerned about single point failures such as the engine pump or filter
block in filter or engine pump.
Not much flying these days. Father/ husband duties and CB override.
Carl
----- Original Message -----
From: "jetboy" <sanson.r@xtra.co.nz>
Sent: Saturday, June 14, 2008 10:58 PM
Subject: Zenith701801-List: Re: Anti Vapour Lock Fuel System
>
> Thanks Carl for part 2.
>
>
> Have you considered series connection for your fuel pumps? That is, to run
> the line from your header tank thru the electric boost pump (which by the
> look of it has through pass ability) then through to the engine driven
> pump and filter.
>
> As far as I know these pumps seldom fail thru blockage which is the only
> feature of a parallel system. Series connection is widely used in GA
> carburetted fuel systems.
>
> Ralph
>
> --------
> Ralph - CH701 / 2200a
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=187934#187934
>
>
>
Message 4
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| Subject: | Re: Anti Vapour Lock Fuel System |
The parallel system with a check valve is a good idea, just need to make
sure the check valve opening pressure is not significant (some are). A
lot of pumps can severely restrict flow if they are not actually pumping.
I have a Weldon 8163 in my Kitfox which has a built-in Bypass. I had
at one point called Holley about their Blue high pressure pumps, and
they told me over the phone to definitely not use their pumps in series
if they were not going to be running as they would restrict flow 50%
or more.
I have an Andair check valve in the shop, and I know from testing it
that it requires at least a couple psi to open, which depending on the
application might be a problem.
Jeff
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=188107#188107
Message 5
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| Subject: | Re: Corrosion Protection |
Be carefull about using ACF-50 or Corrosion-X over Cortec, or else you might see
your Cortec go bye-bye. Cortec needs to be topcoated to be
resistant to just about anything. What you might try doing it thinning some
cortec with alchohol to the consistency of 2% milk, and spraying it
liberally over everything inside. I have two lawn mowers that I leave
out under some bushes as I have no garage space, and the old toro
has half the paint gone across it's deck (aluminum) and it was oxidizing
like crazy, so I took a can of thinned cortec and slopped it all over it with
a paint brush a year ago and it seems to have stopped corroding. I
also hit my daughters tricycle with it as it was rusting, and the rust
stopped as well.
Cortec is definetly not fuel resistant either, I dip tested some cured
cortec in 100LL and it dissolves it before too long as well.
I have a lot of cortec left over from building so I started using it on
everything that is hinting at corroding around the House, and vehicles
and it works pretty good at just simply stopping corrosion even without
any surface prep.
Another alternative which is better than ACF-5, and Corrosion X which
are corrosion preventives meeting MIL-81309 (which are a light film
for avionics connectors, and light hardware), is to use one of the more
durable products like CRC "Corrosion Shell". This is like a product we
used in the Navy on Grumman E-2C's for protecting exposed hardware
we called it Grade 4, but I think it is the same thing. It dries to a brown
waxy film, much better protection than the lighter products, and doesn't
run all over like ACF-50 and Corrosion X will.
http://www.aircraftspruce.com/pdf/2008Individual/Cat08365.pdf
Regards,
Jeff
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=188112#188112
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