Today's Message Index:
----------------------
1. 10:13 AM - Tanl leaks (Steve Sampson)
2. 10:41 AM - Re: Tanl leaks (Stein Bruch)
3. 10:44 AM - Re: Tanl leaks (Steve Sampson)
4. 11:03 AM - Re: Tanl leaks (Jones)
5. 05:29 PM - Re: Tanl leaks (John Oliveira)
6. 07:36 PM - Re: Tanl leaks (Albert Gardner)
7. 08:16 PM - F-904 Question (Vicki Schrimmer)
8. 08:16 PM - F-904 Question (Vicki Schrimmer)
9. 08:42 PM - Re: F-904 Question (Todd Houg)
10. 09:27 PM - Re: Tanl leaks (Dean)
Message 1
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--> RV9-List message posted by: "Steve Sampson" <SSampson.SLN21@london.edu>
I tested one of my QB tanks today for leaks prior to painting. With PVC
tape sealing the drain hole, filler hole and the main fuel exit I dropped
the pressure through the vent connection so I had a differential of about
10" of water on a manometer. The pressure is dropping at about 2" every 30
minutes which must be a very minute leak. How does one go about finding it?
The cork gasket is in place with gasket sealant and I have dipped the screws
securing this cover plate and the fuel sender screws in sealant also.
Thanks, Steve
#90360
UK
Message 2
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--> RV9-List message posted by: "Stein Bruch" <stein@steinair.com>
Hi Steve,
The first trick is to mix a spray bottle with water and soap (dishwashing -
"Dawn" type), and when the tanks are under pressure, spray the whole tank.
Even a minute leak should show some "bubbling".
Make sure you first check the obvious areas:
the drain holes, filler area, etc.. before doing the whole tank. Many times
the leak is just a less than perfect seal on all of the "testing apparatus".
If they are good, then look at the rear baffle, then the fuel sender plate,
then the rib's.
Hope this helps,
Stein Bruch
RV6's, Minneapolis.
http://www.steinair.com
-----Original Message-----
From: owner-rv9-list-server@matronics.com
[mailto:owner-rv9-list-server@matronics.com]On Behalf Of Steve Sampson
Subject: RV9-List: Tanl leaks
--> RV9-List message posted by: "Steve Sampson" <SSampson.SLN21@london.edu>
I tested one of my QB tanks today for leaks prior to painting. With PVC
tape sealing the drain hole, filler hole and the main fuel exit I dropped
the pressure through the vent connection so I had a differential of about
10" of water on a manometer. The pressure is dropping at about 2" every 30
minutes which must be a very minute leak. How does one go about finding it?
The cork gasket is in place with gasket sealant and I have dipped the screws
securing this cover plate and the fuel sender screws in sealant also.
Thanks, Steve
#90360
UK
Message 3
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--> RV9-List message posted by: "Steve Sampson" <SSampson.SLN21@london.edu>
Further to my own query the archives talk about soap water and blowing
bubbles. Is this just ordinary soap?
Message 4
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--> RV9-List message posted by: "Jones" <esnj@granbury.com>
My fuel tank caps leaked fairly significantly around the center rod that
expands the main O-ring. The main O-ring seal didn't leak, just the center
seal...Dick Jones
----- Original Message -----
From: "Steve Sampson" <SSampson.SLN21@london.edu>
Subject: RV9-List: Tanl leaks
> --> RV9-List message posted by: "Steve Sampson"
<SSampson.SLN21@london.edu>
>
> I tested one of my QB tanks today for leaks prior to painting. With PVC
> tape sealing the drain hole, filler hole and the main fuel exit I dropped
> the pressure through the vent connection so I had a differential of about
> 10" of water on a manometer. The pressure is dropping at about 2" every 30
> minutes which must be a very minute leak. How does one go about finding
it?
> The cork gasket is in place with gasket sealant and I have dipped the
screws
> securing this cover plate and the fuel sender screws in sealant also.
>
> Thanks, Steve
> #90360
> UK
>
>
Message 5
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--> RV9-List message posted by: "John Oliveira" <oliveira@frontiernet.net>
Ditto with mine. Only when I really taped and sealed the fillers up did I
get anything resembling no leaks.
John O
----- Original Message -----
From: "Jones" <esnj@granbury.com>
Subject: Re: RV9-List: Tanl leaks
> --> RV9-List message posted by: "Jones" <esnj@granbury.com>
>
> My fuel tank caps leaked fairly significantly around the center rod that
> expands the main O-ring. The main O-ring seal didn't leak, just the
center
> seal...Dick Jones
>
>
> ----- Original Message -----
> From: "Steve Sampson" <SSampson.SLN21@london.edu>
> To: <rv9-list@matronics.com>
> Subject: RV9-List: Tanl leaks
>
>
> > --> RV9-List message posted by: "Steve Sampson"
> <SSampson.SLN21@london.edu>
> >
> > I tested one of my QB tanks today for leaks prior to painting. With PVC
> > tape sealing the drain hole, filler hole and the main fuel exit I
dropped
> > the pressure through the vent connection so I had a differential of
about
> > 10" of water on a manometer. The pressure is dropping at about 2" every
30
> > minutes which must be a very minute leak. How does one go about finding
> it?
> > The cork gasket is in place with gasket sealant and I have dipped the
> screws
> > securing this cover plate and the fuel sender screws in sealant also.
> >
> > Thanks, Steve
> > #90360
> > UK
> >
> >
>
>
Message 6
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--> RV9-List message posted by: "Albert Gardner" <spudnut@worldnet.att.net>
Check the BNC connector also. If you didn't substitute a pressure type
connector, there are reports of the one Vans supplied leaking. Mine did.
Albert Gardner
RV-9A 872RV
Yuma, AZ
Message 7
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--> RV9-List message posted by: Vicki Schrimmer <abusymom@cox.net>
The top flange of the aft half of the F-904 bulkhead has rivet holes for
nutplates. The instructions say to countersink these rivet holes. However,
there are 8 additional 3/32" holes in this flange next to the holes for the
nutplate rivets. Does anybody know what these holes are for? Are we also
suppose to countersink these holes?
Thanks in advance,
Mark Schrimmer
Message 8
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--> RV9-List message posted by: Vicki Schrimmer <abusymom@cox.net>
The top flange of the aft half of the F-904 bulkhead has rivet holes for
nutplates. The instructions say to countersink these rivet holes. However,
there are 8 additional 3/32" holes in this flange next to the holes for the
nutplate rivets. Does anybody know what these holes are for? Are we also
suppose to countersink these holes?
Thanks in advance,
Mark Schrimmer
Message 9
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--> RV9-List message posted by: Todd Houg <thoug@attglobal.net>
Mark,
Those additional holes should be for the top flange of the seat floor ribs that
run between the F-904 and F-905. They will need to be countersunk also. For virtually
all of my nutplates I use the NAS 3/32" oops rivets, so I always countersink
the nutplate rivets.
Todd
-----Original Message-----
From: Vicki Schrimmer
Subject: RV9-List: F-904 Question
--> RV9-List message posted by: Vicki Schrimmer <abusymom@cox.net>
The top flange of the aft half of the F-904 bulkhead has rivet holes for
nutplates. The instructions say to countersink these rivet holes. However,
there are 8 additional 3/32" holes in this flange next to the holes for the
nutplate rivets. Does anybody know what these holes are for? Are we also
suppose to countersink these holes?
Thanks in advance,
Mark Schrimmer
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Message 10
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--> RV9-List message posted by: "Dean" <dvanwinkle@royell.net>
Steve
Crank your tank test pressure up to about 27 inches of H2O which will give
you about one PSI. It will give you a better chance of finding your leaks
and will not damage the tanks. This is what I used with good success on my
RV-9A tanks. I also used a spray bottle of water with a very small amount
of liquid detergent soap.
Dean Van Winkle
Finish Kit/13B NA Rotary
----- Original Message -----
From: "John Oliveira" <oliveira@frontiernet.net>
Subject: Re: RV9-List: Tanl leaks
> --> RV9-List message posted by: "John Oliveira" <oliveira@frontiernet.net>
>
> Ditto with mine. Only when I really taped and sealed the fillers up did I
> get anything resembling no leaks.
>
> John O
> ----- Original Message -----
> From: "Jones" <esnj@granbury.com>
> To: <rv9-list@matronics.com>
> Subject: Re: RV9-List: Tanl leaks
>
>
> > --> RV9-List message posted by: "Jones" <esnj@granbury.com>
> >
> > My fuel tank caps leaked fairly significantly around the center rod that
> > expands the main O-ring. The main O-ring seal didn't leak, just the
> center
> > seal...Dick Jones
> >
> >
> > ----- Original Message -----
> > From: "Steve Sampson" <SSampson.SLN21@london.edu>
> > To: <rv9-list@matronics.com>
> > Subject: RV9-List: Tanl leaks
> >
> >
> > > --> RV9-List message posted by: "Steve Sampson"
> > <SSampson.SLN21@london.edu>
> > >
> > > I tested one of my QB tanks today for leaks prior to painting. With
PVC
> > > tape sealing the drain hole, filler hole and the main fuel exit I
> dropped
> > > the pressure through the vent connection so I had a differential of
> about
> > > 10" of water on a manometer. The pressure is dropping at about 2"
every
> 30
> > > minutes which must be a very minute leak. How does one go about
finding
> > it?
> > > The cork gasket is in place with gasket sealant and I have dipped the
> > screws
> > > securing this cover plate and the fuel sender screws in sealant also.
> > >
> > > Thanks, Steve
> > > #90360
> > > UK
> > >
> > >
> >
> >
>
>
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