Auxiliary tank

[jchang10]

Thanks Jon for sharing your setup. I followed your lead and added a 32 gallon tank that sits in one rear seat. I could easily add another 32 gallon tank in the other rear seat if i wanted.

My main purpose is to just use up the empty seats and to ferry cheap fuel. I don't plan to fly to Hawaii, though i almost could.

This is my new range circles with the Aux Tank.

90 gals
1560 sm radius for 8.5 hours
780 sm radius without refuel

[marv1121]

It may not do the RV-8 guys any good but I have a set of long range tanks that will fit the RV-6-7-9 for sale. They fit in the cutout in the back of the seats and do not use any of the baggage space. Total of 14 gallons which is good for about an additional 300 miles. 419 360-7414

[Geeman]

Originally Posted by marv1121

It may not do the RV-8 guys any good but I have a set of long range tanks that will fit the RV-6-7-9 for sale. They fit in the cutout in the back of the seats and do not use any of the baggage space. Total of 14 gallons which is good for about an additional 300 miles. 419 360-7414

Any pictures? Materials of construction?

[humptybump]

Jon - I'd like to see if you could add to this thread.

Specifically, I'd be very appreciative to see a couple pics of it installed.

• a pic of the fuel vent installed in your plane
• a pick of the hoses when in use

Also, any fueling procedure tips ?

[humptybump]

For those interested in photos of the installation and lots of other details, I recently completed this project and have documented the construction, the installation, and the testing ...

http://www.vansairforce.com/communit...d.php?t=113222

[wera710]

All I can say is you guys are totally hard core or have cast iron backsides...LOL. I am either bored/sore after an hour or two!


But I AM loving that idea of ferrying cheap gas. My home field is always a $1.50 more than everyone else and no amount of commen sense discussion will convince them they will sell WAY more fuel if they are just competitive with the 10 other fields all within spitting distance. Sometimes you just can't fix stupid.

[gmcnair]

I just installed a smaller tank (12 gal) in my RV8 baggage area without changing anything regarding rear seat. I just needed extra fuel for Tanking and return fuel from some of my destinations in Thailand. The Tank is from RCI near Dallas (www.rciracing.com), although it was a Amazon order for me. The model is 2121A and it goes in and out of baggage area very easily. Just fold seat back down as normal. Only ground tested so far. I put 1 gallon of fuel in it and turned on Facet pump (Carbureted Engine) the pump self primed and I was able to start engine and ground run for about 5-10 minutes. I only plan to use it in cruise but good to know it will work in ground attitude. Also with plumbing installed I can easily take Rear seat out and put in a larger tank if I get more adventurous. The plastic cans you see in background are what I carry for runs into local gas stations if 95 mogas is available at destinations. I fly with them empty.
Just another option in the Aux Tank category.
I hope the picture link works.
Regards
Gary M.

https://www.dropbox.com/s/sgehq1zxe9...Tank1.jpg?dl=0

[Romeo Victor]

I am considering the installation of an aux tank system in the baggage compartmet of my RV8.
Since I intend to transfer the fuel from the aux into the main tank, a friend of mine mentioned the point of overpressure in the main tank when the main tank gets completely filled.

Question is: Did anybody consider an overpressure in the main tank produced by the Facet pump?
Will the pressure of the fuel pump overrule the incoming pressure produced by the vent line?
I know that this is an unusual question but may be that someone already discussed this in this forum.
Thanks for answering
Stephan

RV8
#82979

[rv7charlie]

That is a real concern that not many consider. A friend tested it (test rig; not an actual tank) using a fuel injection style pump (higher flow/pressure than a Facet), and found that once the tank is full and fuel is being forced out the AN4 vent, pressure in the tank can go over 10 psi; enough to rupture the tank. I'd still worry with a 6 psi Facet.

The way to manage is to either burn enough out of the main to accept all the fuel from the aux, or use a timer or level sensor to control the transfer pump. A timer is simpler, but you need to establish transfer rate in your particular install, and make sure you burn enough from the main before activating the timer for transfer.

Even if there were no risk to the tank structure, there's no point in pumping fuel overboard. :-)

Charlie

[Pilot135pd]

Originally Posted by jchang10

Thanks Jon for sharing your setup. I followed your lead and added a 32 gallon tank that sits in one rear seat. I could easily add another 32 gallon tank in the other rear seat if i wanted.

My main purpose is to just use up the empty seats and to ferry cheap fuel. I don't plan to fly to Hawaii, though i almost could.

This is my new range circles with the Aux Tank.

90 gals
1560 sm radius for 8.5 hours
780 sm radius without refuel

Either you're young or you also added an additional tank to empty your bladder ! I wouldn't be able to fly so many hours if I wanted to