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Finishing the Fuel lines

December 23, 2016

Inside the fuselage consists of fuel lines between the wing tanks and the engine.  As I already posted, my vents are complete and were relatively easy.  Just eyeball and bend.  The supply lines are not that easy.

For the first time bender I have some advice.  Learn to bend correctly and accurately with your equipment.  I think I mentioned this before, but do not skimp on the bender.  The Harbor Freight bender is absolute trash!  Spend more and get one from Spruce.  I did and am very glad for it.  It came with instructions and between that and some YouTube videos I got smart on how to bend.  I bought some cheap tube from Tractor Supply and practiced until I was ready.

I bought flexible tube from TS Flightlines for the run between the tank and the valve.  Tom does such a great job.  I am also using the standard Vans fuel valve.  I decided I can find other things to do with $400+ other than buy a valve from UK.  I cant see how the supplied one is bad.  My first bending was done on a simple tie in between the fuel filter and pump.  Two 90° bends about 3″ apart.  It was pretty easy and lulled me into a false sense of security.  I then tried bending the bit from the filter to the valve and made lots of scrap in the process.  It consisted of 3 90° bends on two different planes all in a  very small space.  Tom saved the day, again.  I packed up the whole kit and sent it to him.  He turned it around in the same day and easily made the piece I needed.  After this experience I decided to hit the books (videos) and figure out the math behind bending.  As you can imagine once you know the ‘secret’ it is pretty easy to accomplish.

Quite a bit of time lapsed until I was able to construct the last part which is the line from the pump to the firewall.  When I did get to it, I ended up making three different versions of the line.  Each version would have been OK…and maybe wouldn’t have leaked, but the third one was spot on.  I tweaked my measurements until I had it as perfect as I can make it.


Various trys and failures.

I was smart and didn’t forget to put the AN fittings on the any of the lines.  It was my biggest fear…measuring, cutting and flaring perfectly and then fogetting the AN fittings.


The line standing up with the open flare is the one Tom Swearingen made for me.


Line from the firewall to the pump.  As perfect as I think I can make it.  

One warning.  If you are building and RV7/7A and plan on an IO engine, then you need to reference the optional plan 32.  You can find it on the plans DVD or if you dont have that, call Vans, they can get it to you.  The information needed for the firewall passthrough is on that plan.  Also, the AN fitting, nut and washer are part of the FWF kit, so you wont have it in the fuse or finishing kit materials.

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