Today's Message Index:
----------------------
1. 06:04 AM - FAA Small Airplane (roger lambert)
2. 02:26 PM - Fuel System Questions (MHerder)
3. 03:06 PM - Re: Fuel System Questions (Dave Austin)
4. 03:13 PM - Re: Fuel System Questions (Larry McFarland)
Message 1
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| Subject: | FAA Small Airplane |
Could someone provide me with a means to see the report issued by the FAA
shwing the wing structure to be 20 to 30 % low?
Message 2
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| Subject: | Fuel System Questions |
Background: I have used soft aluminum fuel tubing from each of the wing tanks
in my 601 HD. I never really liked the idea of using rubber tubing near me or
passengers. Fuel scares me, and it really scares me in a plastic bubble at 5000
ft. I went to great lengths to make sure that I only have fittings where
absolutely necessary as I view them only as a potential source of leaks. I have
used AN 6 fittings throughout which has turned out to be considerably more
work and more expensive than I could have imagined but Im still not unhappy with
my decision However I have several questions from the firewall foreward.
1) I have used an AN bulkhead fitting to get through the firewall, and I am using
AN fittings to attach to my Facet fuel pump, what type of hose can and should
be used for a custom length fabrication of fuel hose that can be properly firesleeved?
Any good sources?
2) Once I get to the other side of the fuel pump (outlet side), it looks like Ill
have to switch over to the barbed fuel fittings, since that is what is on my
Bing carb anyway (Jab 3300). Is there a suggested way to safety wire the radiatior
hose type clamps?
3) Im using a facet pump, mounted on the front side of the firewall in series with
the mechanical pump on my Jab 3300. I have been told, and seen tests verifying
that indeed, if the facet pump fails that fuel can still be drawn through
the electric pump. In fact the current plan would be that I would only use
the electric pump during takeoff and landing so it would nearly always be drawing
fuel through this pump. As I understand it, this is acceptable, but Id like
a confirmation from somebody that it doesnt put undue stress on the mechanical
pump and potentially make it wear out quicker.
Lots of questions here and Im sure there will be lots of opinions. I want to be
absolutely certain that I do the fuel system right, also everything else But
fuel is certainly one of my greatest concerns, along with the obvious things
like control rigging etc.
--------
One Rivet at a Time!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=283979#283979
Message 3
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| Subject: | Re: Fuel System Questions |
If you put the fuel pumps in series, will that not double the pressure at
the carbs? If you do you could have flooding problems.
Dave Austin 601HDS 912UL
Message 4
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| Subject: | Re: Fuel System Questions |
Michael,
I'd recommend Aeroquip 601 with fittings or 666. Both have a very
protective braid externally and are made for fuel. The fittings and hose
are expensive, but
best suited to your need. I've a water cooled engine and the temps don't
get high enough to worry about the filter and hose seen on my firewall,
but I did use
the hose where it tee'd to the Bing carbs. See image links,
http://www.macsmachine.com/images/subaruengine/full/hose-connections-at-water-p.gif
http://www.macsmachine.com/images/subaruengine/full/hose-reservoir-to-left-fire.gif
http://www.macsmachine.com/images/subaruengine/full/pump&gascolator.gif
Ultimately I put 2 pumps parallel tee'd on a similar plate same place
and doubled back to go up to the short hose and filter that I change
annually.
As long as your pulling thru the pump, the mechanical pump won't be
stressed, but pulling fuel any long distance will get you into trouble
if the pull is negative or less than positive if heat is a factor.
Larry McFarland 601HDS at www.macsmachine.com
MHerder wrote:
>
> Background: I have used soft aluminum fuel tubing from each of the wing tanks
in my 601 HD. I never really liked the idea of using rubber tubing near me
or passengers. Fuel scares me, and it really scares me in a plastic bubble at
5000 ft. I went to great lengths to make sure that I only have fittings where
absolutely necessary as I view them only as a potential source of leaks. I
have used AN 6 fittings throughout which has turned out to be considerably more
work and more expensive than I could have imagined but Im still not unhappy
with my decision However I have several questions from the firewall foreward.
>
> 1) I have used an AN bulkhead fitting to get through the firewall, and I am using
AN fittings to attach to my Facet fuel pump, what type of hose can and should
be used for a custom length fabrication of fuel hose that can be properly
firesleeved? Any good sources?
>
> 2) Once I get to the other side of the fuel pump (outlet side), it looks like
Ill have to switch over to the barbed fuel fittings, since that is what is on
my Bing carb anyway (Jab 3300). Is there a suggested way to safety wire the
radiatior hose type clamps?
>
> 3) Im using a facet pump, mounted on the front side of the firewall in series
with the mechanical pump on my Jab 3300. I have been told, and seen tests verifying
that indeed, if the facet pump fails that fuel can still be drawn through
the electric pump. In fact the current plan would be that I would only use
the electric pump during takeoff and landing so it would nearly always be drawing
fuel through this pump. As I understand it, this is acceptable, but Id like
a confirmation from somebody that it doesnt put undue stress on the mechanical
pump and potentially make it wear out quicker.
>
> Lots of questions here and Im sure there will be lots of opinions. I want to
be absolutely certain that I do the fuel system right, also everything else But
fuel is certainly one of my greatest concerns, along with the obvious things
like control rigging etc.
>
> --------
> One Rivet at a Time!
>
>
>
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