Speaking of the new tank vent....

[Tony_T]

The locations of all the vent holes, i.e., bulkhead, bottom skin, are given in Plans Section 37 available on Van's website under RV12 Support for viewing or download as a PDF file.
https://www.vansaircraft.com/pdf/rev...Section_37.pdf

The location of the hole in the tank top is shown in a new section 37B, which is not on the web site but should be in the vent kit.

The new tank top part must come with the hole already punched since section 37 doesn't show how to locate it.

[TomVal]

Originally Posted by engineerofsorts

They are referring you to the same large-headed blind rivets used for the two static ports--they include one in the kit that you install in the #30 hole you drill in the bottom skin. Then you drive the mandrel out, attach the 1/8" tubing, and stick it in place with some RTV.

Rob,

Now I see...THANKS!

[engineerofsorts]

Originally Posted by Terrybrd

They have the dimensions in drawings 37B-03.
but I don't know if I can copy it to this thread.
I don't know how to post it on here and I tried to copy and paste but that didn't work.
I got it from support but if you want to send me an e-mail I can send you the file. It is about 4 pages with a picture of where to install the fitting on the tank, and the hole in the bulkhead.

mrterrybrd@gmail.com

Hmmm...I couldn't find any 37B pages on Van's website, and the retrofit kit I ordered from Van's did not include any revised instruction pages containing 37B-03. I guess my mother was wrong...I'm not special...

[MartySantic]

See post #41, above. SECTION 37, in its entirety, is on the website.

[E. D. Eliot]

Any harm in rotating the tee of this SB 90 degrees? Looks like a better way to do it to me. Opinions sought.

[engineerofsorts]

Originally Posted by MartySantic

See post #41, above. SECTION 37, in its entirety, is on the website.

I have known/studied the new Section 37 for about a month now, Marty. IT DOES NOT INCLUDE retrotfit instructions, specifically Page 37B-03 referenced by Terrybrd:

Originally Posted by Terrybrd

They have the dimensions in drawings 37B-03.
but I don't know if I can copy it to this thread.
I don't know how to post it on here and I tried to copy and paste but that didn't work.
I got it from support but if you want to send me an e-mail I can send you the file. It is about 4 pages with a picture of where to install the fitting on the tank, and the hole in the bulkhead.

mrterrybrd@gmail.com

If you can point out to me in the new Section 37 where they have any dimensions for the new holes, I'll shut up and put my tail between my legs.

[Hal-san]

Rob, if you are talking about the vent holes in the skin, look at page 37-13.

[Paris12Man]

Rob, if you're speaking of the holes on the bottom of the fuselage required by the new fuel tank system, go to the following link. It is page 37-13 of the new download PDF file. I can't remember if that view is looking down or up, but once you're under your plane, just count the rivets and make the measurements as shown. The holes are aft of the rear bulkhead of the baggage compartment.
Steve
http://www.vansaircraft.com/pdf/revi...Section_37.pdf

[engineerofsorts]

Originally Posted by Paris12Man

Rob, if you're speaking of the holes on the bottom of the fuselage required by the new fuel tank system, go to the following link. It is page 37-13 of the new download PDF file. I can't remember if that view is looking down or up, but once you're under your plane, just count the rivets and make the measurements as shown. The holes are aft of the rear bulkhead of the baggage compartment.
Steve
http://www.vansaircraft.com/pdf/revi...Section_37.pdf

NO NO NO NO--where to put new hole in an old tank and new hole in an old rear bulkhead is the question--All I see is pictures of tanks with the holes already there for the tank/bulkhead--no coordinates given in the new Section 37...apparently I need Section 37B, which is not on Van's Updates web pages.

[Paris12Man]

Sorry sorry sorry Rob.... I no longer have my 37B paperwork, but If I remember correctly, they weren't real helpful in location of the hole in the bulkhead.
I just took measurements off of my aircraft and they are as follows.....
From the outside edge of the seat belt flange, measure down 3 1/2".
From the edge of the bulkhead panel, measure outward perpendicular to the line you just drew 4 3/16"
Now measure up for this 4 3/16" line and the top of the fuselage should be 1 3/4".
If you do all that and it works out. X marks the spot to drill the hole in the bulkhead.
The hole in the top of the fuel tank for the new vent tube is located 1 3/4" from the back edge and 4 3/16" from the outside (copilot) edge.
I hope this helps.
Being an "engineer of sorts" you most likely won't like my opinion, but sometimes you just got to wing it! Remember, you're working with a tube you can bend!

Steve