fuel cap vents

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fuel cap vents

Postby Dave Krall CFII SEL SES » Sun Feb 03, 2008 8:26 pm

Dennis, I think it was on your plane that I saw some lower profile, nicer looking ones than the standard bent tubes.
Did you buy them?
Thanks
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nope

Postby scubarider2 » Sun Feb 03, 2008 9:49 pm

Nope, used the ones they gave me.  Low to the wing but long to the front.  
I am still having some problems with the left side though.  Still putting some gas out the tube.  Maybe just too full.  Not leaking after a couple gallons used so must be that.  I cleaned and lightly sanded the inside of the tank which made no more leaking from the cap.
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fuel cap vents

Postby John S » Tue Feb 05, 2008 10:29 pm

Hi, guys,
I have the caps with tabs that flip up (after a mighty lift and pull), and Tim told me to drill vent holes through only the top surface of the cap, not all the way through.  I can't figure out how that will vent the tank.  Anyone have any experience or suggestions?

Thanks.
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did the same

Postby scubarider2 » Fri Feb 08, 2008 2:25 pm

Yep, did the same.  You can only drill through the top section since the bottom section is the one that moves to seal the cap to the tank.  It does vent, mine does and maybe too well.  One side leaking.  Not sure why the other is not.  hmmmmm   Be careful when you bond the vent tube also.  I made that first mistake and bonded it to the bottom, too much epoxy.  It would not open and close.  So had to heat, remove and rebond.  Now works ok.  
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Postby DaveU » Fri Feb 08, 2008 11:31 pm

I drilled the top to allow the tube to be inserted and epoxied in place.  I also drilled the bottom piece, otherwise I did not see how it would vent.

I just took the cap apart, drilled both portions, and then made sure that the hole in the top was not directly in line with the bottom when I tightented the lock nut.

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Postby Uwe Jens » Sat Feb 09, 2008 9:18 am

Hi Guys,
It was my way,more simple. :)
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Postby b1x4nqb » Sat Feb 09, 2008 10:44 pm

Uwe,

Did you just drill right into the top of the tank and epoxy or did you use something to support it on the tank as you mounted.  Maybe just some body puddy I'm seeing around it under the skin.  

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Postby Uwe Jens » Sat Feb 09, 2008 11:16 pm

Hi Paul,
If you seen on the tank, it has some internal divisions. On this site, the fiber glass is wider, I drilled a hole just on the side of the division and put some epoxy.  It is quite rigid. I think I wil have no problem.  The other system on drilling the cap I don´t really understand how it works if you don´t drill the internal side of the cap.  I had some doubts about the good work of the cap after doing the drilling ( fuel leaking, etc)
That is all,
Uwe/.
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weird

Postby scubarider2 » Sun Feb 10, 2008 9:23 am

It is weird how it works but it does.  I only drilled the top and put the tube in just like the directions have you do.  The vent WORKS.  I can see gas fumes escaping.  As I have said I do have one that leaks gas out of the tube though.  Not sure why one but not the other.  It is not leaking now due to the drop in fuel in the tank {after flying it for awhile  :D  }
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Postby b1x4nqb » Sun Feb 10, 2008 9:44 am

Uwe,

I was wondering about putting the vent tube even farther towards the cockpit to allow more room for when the wings are folded and to avoid fuel seepage out.  I see it is reinforced along the edge as well.  The one thing I question about doing this right on the edge is that if I recal some type of gap cover goes over this section.  I don't recall any pieces from JA for this in my kit but I remember seeing Troy fold unfold one to reveal this gap as it was not visible once in flight mode or unfolded.  I will be folding regularly so I'm looking for the best option.  I'd prefer to fill it up before storage to keep out moisture.  On the other hand, others on here have had no problems with just drilling the caps but I wonder if anybody really uses the fold option as much??

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Postby Uwe Jens » Sun Feb 10, 2008 11:52 am

Hi Paul and Dennis
We don´t need to forget that these venting tubes are not only for ventilation but also for pressurized the fuel tanks while flying.  THis is why I still don´t understand how the drill caps works.
Paul, I believe you could place the venting tubes on the closer side of the tank to the cockpit, so when you fold the wings they stay on the higher place and won´t have a fuel leakeage,  if you fix the tubes on the tank you will have a problem, since you´ll change the tubes direction.  They will end up perpendicular with the air flow producing a ventury and it will suck the fuel from the tanks to the outside.
I have an idea, I am giving you some numbers on pieces of Spruce since I am not sure on how to explain this in English.  
You could place AN816 NIPPLE on the tank, size 1/4 Steel 4-4; then you put a NUT sleeve Coupling in the tubes, this way you can release the nut and turn the tubes to the other side when you fold the wings, this will always make the tubes will be right with the airflow; or just place a plug in the tubes when you fold the wings.
I hope you get the idea,  I think the people who already placed the tubes in the caps also will need to rotate the caps when they fold the wings to prevent the ventury suction.
Regards, Uwe/.
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Postby Uwe Jens » Sun Feb 10, 2008 12:22 pm

Paul ,Look the attachment.
uwe/.
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Postby Dave Krall CFII SEL SES » Mon Feb 11, 2008 5:55 pm

I'd sure like to know of an easy way to vent fuel tanks without the tubes sticking up. They're inconvenient when one wants to throw a tarp over the wing for shade & shelter.
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Postby Johnny C! » Tue Feb 12, 2008 10:36 pm

Dave,
 I guess you could buy two extra fuel caps & not install
the tubes for those times when you want to cover the aircraft.

I think it would be a little risky drilling into the top
of the tanks. If you happen damage that joint, it
could leave you in a real bind to replace the tank.

I'll live with the ram tubes in the caps...


John
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flying an airplane. There is no sense in rushing any of the others.

I would much rather be looking down at the runway, than up at it.

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Postby Dave Krall CFII SEL SES » Wed Feb 13, 2008 12:51 am

Johnny C! wrote:Dave,
 I guess you could buy two extra fuel caps & not install
the tubes for those times when you want to cover the aircraft.

I think it would be a little risky drilling into the top
of the tanks. If you happen damage that joint, it
could leave you in a real bind to replace the tank.

I'll live with the ram tubes in the caps...


John


Maybe if the caps  were left loose John. Still need venting for cool nights turning to hot days...
I guess Cessna type vents on the bottom of tanks must have a pressure valve?
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