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1906
Joined: 30 Nov 2018
Posts: 58
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 Posted: Mon Aug 10, 2020 10:47 am Post subject: Carb and fuel pump membrane replacement |
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I'd like to replace the carb and fuel pump membranes and I'd like to make sure I have everything I need before I begin.
I assume it would be helpful to drain the system fuel before replacing these?
Will the replacement of either require additional gaskets?
I assume no sealant used on the membranes?
One of the fuel pump membranes is under the bottom cap (as seen on the engine). Where does the second one go?
Does anything need to be done after replacing other than pumping the system to normal pressure and checking for leaks?
Thanks!
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dsavarese0812(at)bellsout
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| Posted: Mon Aug 10, 2020 11:38 am Post subject: Carb and fuel pump membrane replacement |
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Not necessary. Shut the fuel off at the fuel shut off in the cockpit.
That's all you need to do. You'll get a small amount of fuel leakage
from the carb and pump. But nothing significant.
No additional gaskets. And heaven forbid! DO NOT put any type of
sealant on the covers.
Where did you see a second fuel pump membrane/diaphragm? Please share
that with me/us.
Nothing else other than what you've stated needs to be done.
Dennis
A. Dennis Savarese
334-546-8182
www.yak-52.com
On 8/10/2020 2:47 PM, 1906 wrote:
| Quote: |
I'd like to replace the carb and fuel pump membranes and I'd like to make sure I have everything I need before I begin.
I assume it would be helpful to drain the system fuel before replacing these?
Will the replacement of either require additional gaskets?
I assume no sealant used on the membranes?
One of the fuel pump membranes is under the bottom cap (as seen on the engine). Where does the second one go?
Does anything need to be done after replacing other than pumping the system to normal pressure and checking for leaks?
Thanks!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=497628#497628
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1906
Joined: 30 Nov 2018
Posts: 58
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| Posted: Mon Aug 10, 2020 6:15 pm Post subject: Re: Carb and fuel pump membrane replacement |
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Dennis, thank you so much and you are correct. The second membrane I have that looks similar to the fuel pump is actually for the carburetor. This one doesn't look very easy to replace with the carb installed...
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Yakjumper
Joined: 28 Nov 2016
Posts: 21
Location: Germany
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| Posted: Mon Aug 10, 2020 9:25 pm Post subject: Re: Carb and fuel pump membrane replacement |
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The membrane also seals the carb cover. Its a flat piece of rubber with cotton net inside.
Install it without any stress on the screw holes. Flat and even. Watch for the "hook" when installing/removing it.
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pennington.construction.i
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Yakjumper
Joined: 28 Nov 2016
Posts: 21
Location: Germany
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| Posted: Tue Aug 11, 2020 7:52 am Post subject: Re: Carb and fuel pump membrane replacement |
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Yes, you do reuse nuts&washers which are in the old membrane. You need a new cotter pin.
The case cover might be a bit hard (sticky) to remove, pry it only a little. You need to unhook it from the rest before you can remove it.
Remember the orientation of the hook assembly. The membrane has plenty of holes, make sure is the right side when installing.
Securing everything with safety wire afterwards is a bit tight & challenging.
I have never seen the second membrane in the carb. Had the carb of my second Yak O/H at Termikas (was clogged), they told me that there are 2 membranes.
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pennington.construction.i
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| Posted: Tue Aug 11, 2020 8:07 am Post subject: Carb and fuel pump membrane replacement |
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Thank you. I will pay attention as I take the covers off. I will re use the hook on the old membrane etc.
I will be taking my carb off making it easier to safety wire things. The top membrane can not be changed with the carb on the plane.
I have attached a photo showing the position of both membranes.
Thanks you again for the info. 👍
Mark Pennington
[img]cid:173de446c5d91742241[/img]
On Tue, Aug 11, 2020 at 12:00 PM Yakjumper <tobias(at)macnews.de (tobias(at)macnews.de)> wrote:
| Quote: | --> Yak-List message posted by: "Yakjumper" <tobias(at)macnews.de (tobias(at)macnews.de)>
Yes, you do reuse nuts&washers which are in the old membrane. You need a new cotter pin.
The case cover might be a bit hard (sticky) to remove, pry it only a little. You need to unhook it from the rest before you can remove it.
Remember the orientation of the hook assembly. The membrane has plenty of holes, make sure is the right side when installing.
Securing everything with safety wire afterwards is a bit tight & challenging.
I have never seen the second membrane in the carb. Had the carb of my second Yak O/H at Termikas (was clogged), they told me that there are 2 membranes.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=497646#497646
http://wwhttp://wiki.matronics.com< f="http://www.matronics.com/contribution" rel="noreferrer" target="_b====
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pennington.construction.i
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| Posted: Tue Aug 11, 2020 8:44 am Post subject: Carb and fuel pump membrane replacement |
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I forgot to give credit for the attached photo.
The photo was sent out by Richard Goode showing the position and what needs to be removed for each membrane.
Thank you Richard. 👍
Mark Pennington
On Tue, Aug 11, 2020 at 12:00 PM Yakjumper <tobias(at)macnews.de (tobias(at)macnews.de)> wrote:
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1906
Joined: 30 Nov 2018
Posts: 58
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| Posted: Tue Aug 11, 2020 1:52 pm Post subject: Re: Carb and fuel pump membrane replacement |
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The accelerator pump membrane (carb top) is the one I was confused about and I do agree that it doesn't look like it can be replaced while the carb is installed. Richard seems to think otherwise though.
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pennington.construction.i
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| Posted: Tue Aug 11, 2020 2:04 pm Post subject: Carb and fuel pump membrane replacement |
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The only way that I see that would be possible is if the nuts were removed and the studs removed. Slide the top off. ?
Maybe. ?
Open for an education.
Has anyone done this before ?
Mark
On Tue, Aug 11, 2020 at 5:59 PM 1906 <zmadwolf(at)gmail.com (zmadwolf(at)gmail.com)> wrote:
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1906
Joined: 30 Nov 2018
Posts: 58
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| Posted: Thu Aug 13, 2020 9:55 am Post subject: Re: Carb and fuel pump membrane replacement |
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Richard confirmed that the carburetor has to be removed.
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pennington.construction.i
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| Posted: Thu Aug 13, 2020 10:16 am Post subject: Carb and fuel pump membrane replacement |
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Thank you for the confirmation.
It was my plan to remove the carb to make sure everything was done as easily as possible.
I didn’t want to damage the membranes.
I plan to take many photos of the process.
Thank you again.
Mark Pennington
On Thu, Aug 13, 2020 at 2:08 PM 1906 <zmadwolf(at)gmail.com (zmadwolf(at)gmail.com)> wrote:
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