Today's Message Index:
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1. 03:14 AM - Re: Fuel return line on a 912 ULS (Mike Hoffman)
2. 07:26 AM - Re: Re: Fuel return line on a 912 ULS (Terry Phillips)
3. 03:22 PM - Web Cam (Tommy Walker)
Message 1
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| Subject: | Re: Fuel return line on a 912 ULS |
Hi Terry and everyone that responded,
I am foo far along to pull a fuel tank and add a extra fitting to it. My original
plan was to put a tee in one of the fuel lines, some where between one of the
tanks and the gascolator. After reading everyone's remarks, I like the idea
of drilling into the top of the gascolator and installing the return line there.
No, I do not have any check valve installed in my fuel lines and presently don't
see a need for it.
Mike H
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=186336#186336
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| Subject: | Re: Fuel return line on a 912 ULS |
I hadn't thought of that, Dan, but that could be a concern. I'll have to
run that past Clayton. Thanks for the thought.
Off the top of my head, I think the risk would be minimal at least in a
normal A/C attitude, because the tank is at atmospheric pressure because it
is vented, the tank is pretty low in the system, and the <#60 orifice in
the tee would greatly restrict liquid flow.
I think I'm questioning the need for the return line because the boost pump
would pretty quickly push any air or vapor through the carb, and then the
motor would run again. Of course, if it stopped on takeoff, 200 ft above
the ground, the restart might be too late to do any good. Clayton is
supposed to visit (my 2 neighbor 601XL builders and) me on 6/14. I'll ask
him then and post any insight I get.
Terry
Terry
At 11:20 AM 6/4/2008 -0700, Dan wrote:
>I'm curious if you're also installing a check valve. One of the issues I
>contemplated was in the case of an engine fire. If you shut off the main
>line, is there a possibility of fuel backflowing from the tank through the
>return line to the engine.
>
>Dan
> > I'm building a 601XL/Jab 3300 with fuel pumps in the wings, so my issues
> > are different. But, Clayton, my EAA tech counselor insists that a return
> > line is important and can really help with restarting the engine if vapor
> > lock happens. I cannot seem to understand his reasoning, but, Clayton is a
> > very experienced, smart guy, so I'll probably put it in. I was going to
> use
> > 1/4" aluminum for the return line, and plumb it into the end of the gas
> > tank, probably using something like the Earl's AT985064 fitting, possibly
> > augmented with an Earl's Stat-O-Seal washer on the inside of the tank. The
> > fitting would be installed on the end of the tank using a wrench inserted
> > through the fuel gage hole. I'm a bit nervous about using a bulkhead
> > fitting on the sheet metal of the tank, but I don't want to try welding a
> > connection onto the tank. How are you connecting to the tank, Mike? In the
> > engine compartment, Clayton suggests putting a tee in the fuel line just
> > upstream of the carb with the return line connected to the branch,
> > preferably pointed upwards. Then he suggests filling the branch of the tee
> > with solder and drilling a smaller than #60 hole for air to return to
> the tank.
> >
Terry Phillips
ttp44~at~rkymtn.net
Corvallis MT
601XL/Jab 3300 s .. l .. o .. o .. w build kit - Tail, flaps, & ailerons
are done; working on the wings
http://www.mykitlog.com/N47TP/
Message 3
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Hi Listers,
I had an old web camera set up in my garage when I was building our first 701 and
had quiet a few folks visit and look at the construction progress. I usually
work a little every day as soon as I get through with my supervisor's list.
She is a hard taskmaster.
Anyway, my buddy and I bought an abandoned project and have started building another
701. We found one in Kingman, AZ and started work on it a couple of weeks
ago. We also searched for and found a used 912ULS engine with just 382 hours.
I think it belonged to a retired school teacher who just flew it to church
and back on Sunday morning at 4900 RPM (big grin). Actually, I think we found
a very well maintained engine. The logs are very detailed.
And yes, there are problems with buying a used, partially finished kit. I tried
to write about it and sent it to Jon Croke to include in his Newsletter. Hopefully
it will be interesting reading.
So, if you would like to pop in to cyber visit, just click on this link:
http://24.119.93.222/img/main_fs.htm
The link changes from time to time. I will try to keep it updated through http://www.ch701.com under the builder's links.
If I'm in the garage working, there is no voice on the web cam, and I'm kinda ugly
so be warned beforehand.
:)
Tommy Walker in Alabama
N8701 60+ Hrs.
Do Not Archive...
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Tommy Walker
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=186421#186421
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