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Leaky carb

 
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apatton2



Joined: 17 Jan 2018
Posts: 27

PostPosted: Sun Jul 08, 2018 8:30 pm    Post subject: Leaky carb Reply with quote

Hi All,
I've noticed twice now that my carb (overhauled unit w/ ~50 hrs on it) will leak gas after I land and refuel.

More detail:

    ø It seems to leak through the throat of the carb
    ø It drips once every 3-5 sec
    ø I only have noticed it immediately post-fueling (perhaps it was dripping after shutdown, but I didn't notice)

Today I think it dripped for around 45min after fueling. Weird.

Any thoughts on what could be responsible? When the engine is running I would expect all of this fuel to be sucked into the carb itself. Relative to the amount of fuel an M14 uses this should be trivial.

Many thanks,
Andrew


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Andrew Patton
Yak-50
San Francisco, CA
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dsavarese0812(at)bellsout
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PostPosted: Mon Jul 09, 2018 3:11 am    Post subject: Leaky carb Reply with quote

Call whoever overhauled the carburetor for you and tell them the carb is leaking and ask them to repair it.
Dennis

From: apatton2 <apatton(at)alumni.princeton.edu>
To: yak-list(at)matronics.com
Sent: Monday, July 9, 2018 12:33 AM
Subject: Leaky carb


--> Yak-List message posted by: "apatton2" <apatton(at)alumni.princeton.edu (apatton(at)alumni.princeton.edu)>

Hi All,

I've noticed twice now that my carb (overhauled unit w/ ~50 hrs on it) will leak gas after I land and refuel.

More detail:

ø It seems to leak through the throat of the carb

ø It drips once every 3-5 sec

ø I only have noticed it immediately post-fueling (perhaps it was dripping after shutdown, but I didn't notice)

Today I think it dripped for around 45min after fueling. Weird.

Any thoughts on what could be responsible? When the engine is running I would expect all of this fuel to be sucked into the carb itself. Relative to the amount of fuel an M14 uses this should be trivial.

Many thanks,

Andrew

--------

Andrew Patton

Yak-50

San Francisco, CA

Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=481500#481500


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richard.goode(at)russiana
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PostPosted: Mon Jul 09, 2018 3:30 am    Post subject: Leaky carb Reply with quote

We overhauled it, and of course stand by it! Normally I would put it down to a faulty membrane, but it was new and therefore most unlikely. But I suspect it is a sticking fuel valve. We will be looking into it.

Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW

Tel:  +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com


From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of A. Dennis Savarese
Sent: 09 July 2018 12:11
To: yak-list(at)matronics.com
Subject: Re: Leaky carb

Call whoever overhauled the carburetor for you and tell them the carb is leaking and ask them to repair it.

Dennis


From: apatton2 <apatton(at)alumni.princeton.edu (apatton(at)alumni.princeton.edu)>
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Sent: Monday, July 9, 2018 12:33 AM
Subject: Leaky carb


--> Yak-List message posted by: "apatton2" <apatton(at)alumni.princeton.edu (apatton(at)alumni.princeton.edu)>



Hi All,

I've noticed twice now that my carb (overhauled unit w/ ~50 hrs on it) will leak gas after I land and refuel.



More detail:



ø It seems to leak through the throat of the carb

ø It drips once every 3-5 sec

ø I only have noticed it immediately post-fueling (perhaps it was dripping after shutdown, but I didn't notice)



Today I think it dripped for around 45min after fueling. Weird.



Any thoughts on what could be responsible? When the engine is running I would expect all of this fuel to be sucked into the carb itself. Relative to the amount of fuel an M14 uses this should be trivial.



Many thanks,

Andrew



--------

Andrew Patton

Yak-50

San Francisco, CA









Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=481500#481500










http://www.matronics.com/Np; - MATRONICS WEB FORUMS -
<; --> http:/nbsp; - NEW MATRONICS LIST WIKI -matronics.com/" target="_blank">http://wiki.matronics.com



; -Matt Draltp://www.matronics.com/contribution" target="_blank">http://www.matronics==


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bwade154(at)yahoo.com
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PostPosted: Mon Jul 09, 2018 4:27 am    Post subject: Leaky carb Reply with quote

Just because I'm a curious kind of guy after it stops leaking and you pressurize the system side with the primer does it start leaking again?

On ‎Monday‎, ‎July‎ ‎9‎, ‎2018‎ ‎12‎:‎41‎:‎27‎ ‎AM‎ ‎EDT, apatton2 <apatton(at)alumni.princeton.edu> wrote:




--> Yak-List message posted by: "apatton2" <apatton(at)alumni.princeton.edu (apatton(at)alumni.princeton.edu)>

Hi All,

I've noticed twice now that my carb (overhauled unit w/ ~50 hrs on it) will leak gas after I land and refuel.

More detail:

ø It seems to leak through the throat of the carb

ø It drips once every 3-5 sec

ø I only have noticed it immediately post-fueling (perhaps it was dripping after shutdown, but I didn't notice)

Today I think it dripped for around 45min after fueling. Weird.

Any thoughts on what could be responsible? When the engine is running I would expect all of this fuel to be sucked into the carb itself. Relative to the amount of fuel an M14 uses this should be trivial.

Many thanks,

Andrew

--------

Andrew Patton

Yak-50

San Francisco, CA

Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=481500#481500



http://forums.sp; - NEW MATRONICS LIST WIKI -
http://wiki.matronics.com
<==================


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apatton2



Joined: 17 Jan 2018
Posts: 27

PostPosted: Sun Jul 15, 2018 7:04 pm    Post subject: Re: Leaky carb Reply with quote

What's interesting is that I tried shutting off the plane today by pulling the fuel shutoff valve several times. The engine dies around 10sec later, but the carb still drips! Was not expecting that.

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Andrew Patton
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