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  #1  
Old 11-04-2018, 07:07 AM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 3,661
Default Vent line modifications

I read about mud daubers and such clogging up vent lines - leading to fuel starvation and/or a collapsed tank.

I did two mods to address this:
- The last few inches of line is inserted into a 3/8? tube. The 3/8? tube provides the needed surface area to JB weld on a piece of aluminum screen. After the epoxy sets a few seconds on a stochbrite wheel to make it smooth. Done.
- I also wanted a backup in case of ice build up. I added a vacuum breaker valve. The valve is inside the airplane but as it only allows air in, any fuel burping out of the tanks still just goes out of the vents. The valve itself is very light and rated for fuel. I got it from McMaster Carr: https://www.mcmaster.com/plastic-check-valves
Part number 5492K51

The first photo is for the RV-10 or RV-14:

The next photo is the same idea but for an RV-8/8a:


Carl
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  #2  
Old 11-04-2018, 10:31 AM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 7,136
Default

I read a good tip a few years back. I installed a bent wire (like a paperclip) pushed into the vent fitting exiting the fuse. You use the bend to keep tension against the ID. 500 hours later, it still there. It makes the passage impossible for the daubers to get through.

I also added a check valve to vent cabin air into the vent line in case of ice over on the exterior fitting. A wise move for IFR flyers. Just be sure it has a low open pressure/vacuum rating.

Larry
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N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
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  #3  
Old 11-04-2018, 12:11 PM
wirejock's Avatar
wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 5,215
Default JD Air Vents

I'm using these. They have a screen built in. Gain a knot or two as well. Probably not but the look cool.
https://www.jdair.com/categories/Fuel-Vents/
__________________
Larry Larson
Estes Park, CO
wirejock at yahoo dot com
Donated 12/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved (3,000+ hours)
Empennage, wings, fuse, finishing kit done. Working FWF
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #4  
Old 11-04-2018, 05:06 PM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 3,661
Default

Quote:
Originally Posted by wirejock View Post
I'm using these. They have a screen built in. Gain a knot or two as well. Probably not but the look cool.
https://www.jdair.com/categories/Fuel-Vents/
Good option for the RV-10 or 14. Will not work on the RV-8/8A.

Carl
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  #5  
Old 11-04-2018, 07:00 PM
rvdave rvdave is offline
 
Join Date: Jun 2005
Posts: 462
Default

I did two mods to address this:
- The last few inches of line is inserted into a 3/8? tube. The 3/8? tube provides the needed surface area to JB weld on a piece of aluminum screen. After the epoxy sets a few seconds on a stochbrite wheel to make it smooth. Done.
- I also wanted a backup in case of ice build up. I added a vacuum breaker valve. The valve is inside the airplane but as it only allows air in, any fuel burping out of the tanks still just goes out of the vents. The valve itself is very light and rated for fuel. I got it from McMaster Carr: https://www.mcmaster.com/plastic-check-valves
Part number 5492K51


I?ve thought about doing something like this for the 10. So do I have this right, you go from the tank to inside the plane(maybe under seats) to a tee with valve back out to the wing fairing?
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Cadillac, Mi
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  #6  
Old 11-04-2018, 07:38 PM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 3,661
Default

Quote:
Originally Posted by rvdave View Post
I did two mods to address this:
- The last few inches of line is inserted into a 3/8? tube. The 3/8? tube provides the needed surface area to JB weld on a piece of aluminum screen. After the epoxy sets a few seconds on a stochbrite wheel to make it smooth. Done.
- I also wanted a backup in case of ice build up. I added a vacuum breaker valve. The valve is inside the airplane but as it only allows air in, any fuel burping out of the tanks still just goes out of the vents. The valve itself is very light and rated for fuel. I got it from McMaster Carr: https://www.mcmaster.com/plastic-check-valves
Part number 5492K51


I?ve thought about doing something like this for the 10. So do I have this right, you go from the tank to inside the plane(maybe under seats) to a tee with valve back out to the wing fairing?
No. The vent line remains in the wing root. Just add a T like is shown in the photo.

Carl
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  #7  
Old 11-05-2018, 05:25 AM
bobnoffs bobnoffs is offline
 
Join Date: Jul 2012
Location: n. wi
Posts: 932
Default

i used a screen out of a kitchen faucet but they are becoming hard to find.a ''head shop'' has perfect screens for about a dime a piece.
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Bob Noffs
n. wi.
dakota hawk/jab 3300 built and flying. sold 6/18.getting serious about the 12. in the hangar now as of 10/15/19
RV-12 kit as of 9/13
RV-12 airworthiness cert. 11/30/2021
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  #8  
Old 11-05-2018, 08:38 AM
Ralph Inkster Ralph Inkster is offline
 
Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 1,794
Default

Just curious. How fine a mesh/obstruction is needed to keep these pests out of the vent?
In past I've drilled small holes to criss cross at 90 degrees through the vent tube (or fitting) and inserted safety wire through them, held in place by shop peening the holes. Worked fine to this point for the pests we have around here, but am now wondering if this would be valid protection where mud doppers are a real problem.
My only experience with doppers was in a set of tanks that was brought to me to check out, I found the flop tube totally plugged by the little guys.
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Ralph
built a few RVs, rebuilt a few more, hot rodded more, & maintained/updated a big bunch more
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  #9  
Old 11-05-2018, 09:07 AM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 3,661
Default

I just used standard aluminum window screen material on the last three RVs. It keep the critters out.

Carl
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  #10  
Old 11-05-2018, 09:08 AM
Ron RV8's Avatar
Ron RV8 Ron RV8 is offline
 
Join Date: Nov 2010
Location: Okanagan Valley BC, Canada
Posts: 503
Default

Originally Posted by wirejock View Post
I'm using these. They have a screen built in. Gain a knot or two as well. Probably not but the look cool.
https://www.jdair.com/categories/Fuel-Vents/

Quote:
Originally Posted by Carl Froehlich View Post
Good option for the RV-10 or 14. Will not work on the RV-8/8A.

Carl
I've got em on my -8 with a Rocket style tubing coil in the wing root. No issues...
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Okanagan Valley BC, Canada
RV-8 Completed Dec 2013

Membership renewed Nov 22, 2021
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