REFLECTOR: Vent Check Valve No-Yes

Mon Mar 14 07:21:44 CDT 2011

Do you know the number of the PCV valve you used. I'd like to try it. The check valve I have still seems to leave a little oder of fuel. 
Mike

--- On Sun, 3/13/11, Bellsouth Home <dugasd at bellsouth.net> wrote:

> From: Bellsouth Home <dugasd at bellsouth.net>
> Subject: Re: REFLECTOR: Vent Check Valve No-Yes
> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
> Date: Sunday, March 13, 2011, 7:55 PM
> I did the same. Used a PCV valve from
> NAPA. Never smell fuel.  Blow through it at annual. 
> 
> Sent from Rene's iPad.
> 
> 
> On Mar 13, 2011, at 4:40 PM, Glenn Babcock <glennbabcock at roadrunner.com>
> wrote:
> 
> > The check valve goes on the alternate vent inside the
> cabin.  You put a T-fitting In the vent line and run
> one side out of the cabin, the other side in the cabin with
> the check valve.  It's a backup in case the exterior
> vent is clogged. I have this setup, works great. 
> > 
> > Regards,
> > 
> > Glenn
> > 
> > 
> > On Mar 13, 2011, at 3:59 PM, Scott Derrick <scott at tnstaafl.net>
> wrote:
> > 
> >> Of course not!  Do you smell fuel in a
> Cessna, Piper, Beechcraft, etc...  Their fuel vents
> don't have one way valves.
> >> 
> >> If you smell fuel in the cabin you have a
> leak!  Nothing to do with that one way valve.
> >> 
> >> Scott
> >> -------- Original Message --------
> >> Subject: Re: REFLECTOR: Vent Check Valve No-Yes
> >> From: Mike Dawson <medawson250 at yahoo.com>
> >> To: Velocity Aircraft Owners and Builders list
> <reflector at tvbf.org>
> >> Date: 03/13/2011 01:42 PM
> >> 
> >>> Without the check valve in the vent line don't
> you get that fuel smell permeated in the interior. That is
> what it is for, let the air in , keep the gas out!
> >>> 
> >>> --- On Sun, 3/13/11, Scott Derrick<scott at tnstaafl.net> 
> wrote:
> >>> 
> >>>> From: Scott Derrick<scott at tnstaafl.net>
> >>>> Subject: REFLECTOR: Vent Check Valve
> No-Yes
> >>>> To: "Velocity Aircraft Owners and Builders
> list"<reflector at tvbf.org>
> >>>> Date: Sunday, March 13, 2011, 11:42 AM
> >>>> I'm not too sure about the vent check
> >>>> valve that has been added to the kit.
> >>>> 
> >>>> The general description of the vent system
> is to plumb all
> >>>> vents, L&R tanks and sump into a block
> high on the cabin
> >>>> side of the fire wall.  A feed line
> is plumbed into the
> >>>> same block that travels down to the bottom
> of the fuselage
> >>>> and is  positioned or set up to apply
> positive pressure
> >>>> to the vent system in flight.  Mime
> is plumbed to a
> >>>> little NACA scoop on the bottom of the
> fuselage.
> >>>> 
> >>>> At some time after 2000,  a one way
> valve was added to
> >>>> the feed line to only allow air into the
> system. Why?
> >>>> I'm assuming it was to prevent fuel from
> leaking out of the
> >>>> vent system in case of an accident or
> something?  Or
> >>>> was there a different reason?
> >>>> 
> >>>> I bought a valve recently and have yet to
> add it as I've
> >>>> flown the plane for 600 hours with nary a
> problem with the
> >>>> fuel system.
> >>>> 
> >>>> The problem with adding this valve is it
> prevents pressure
> >>>> from escaping the system.  Fuel tanks
> are vented to
> >>>> allow air in and to allow vapor out when
> the fuel expands
> >>>> from heat. We've all filled up an
> airplane, parked it on the
> >>>> ramp, only to discover it puked a puddle
> of fuel onto the
> >>>> ramp as the cool fuel heated up in the
> sun.
> >>>> 
> >>>> Now that valve won't let that happen, and
> if your system is
> >>>> tight you will be pressuring it as the
> fuel heats up. Is
> >>>> that a problem?  I don't know.. 
> A couple of
> >>>> months ago I calibrated my fuel tank
> sensors, adding fuel
> >>>> into each tank in 5 gallon increments
> until full. I had
> >>>> planed on flying immediately after words
> but something came
> >>>> up.  I pushed the plane back into the
> hanger but the
> >>>> sun was shining in on the plane. I was
> futzing with
> >>>> something on my workbench when I heard
> dripping.  I
> >>>> looked arouns and saw a stream of fuel
> dripping from the
> >>>> bottom of the
> fuselage!   Just like I've seen
> >>>> from Bonanzas, Cessnas, etc..  I got
> all excited and
> >>>> looked into the cabin thinking I would
> find a cabin full of
> >>>> fuel, nothing.  I looked under the
> fuselage and could
> >>>> then see it was coming out of the
> vent  It then
> >>>> stopped.  I popped a fuel cap and
> left it un compressed
> >>>> so anymore pressure wouldn't build up
> while the tanks were
> >>>> completely full!  Now if I had that
> vent in there, the
> >>>> pressure would have built up, and up?
> >>>> 
> >>>> How high, I don't know.
> >>>> 
> >>>> 
> >>>> Scott
> >>>> 
> >>>> --
> >>>> Stand porter at the door of thought.
> >>>> Mary Baker Eddy
> >>>> 
> >>>>
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> >>> 
> >>> 
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> >> 
> >> -- 
> >> No pessimist ever discovered the secret of the
> stars or sailed an uncharted land, or opened a new doorway
> for the human spirit.
> >> Helen Keller
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