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dlm34077
Joined: 10 Feb 2007
Posts: 115
Location: AZ
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 Posted: Wed Nov 17, 2010 8:52 pm Post subject: fuel filter maintenance |
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At the second annual, we removed, cleaned, installed and leak tested the filter. TT was 265 hours. I believe I posted the pictures at that time. A few tiny black specks were found. The fuel filter was in excess of 99% completely clean and clear which suggests to me that unless an aircraft fuel tanks were not cleared of proseal after construction little will be found in the filter. A more likely problem could occur at the screens that may clog in each tank. As Kelly said there is a bypass anyway if the primary filter becomes clogged. Simply put, removing and cleaning the fuel filter at every annual is , in my judgment, overkill.
[quote][b]
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jesse(at)saintaviation.co
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| Posted: Wed Nov 17, 2010 9:13 pm Post subject: fuel filter maintenance |
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I do agree that it is very unlikely that the filter will become clogged, although I don't necessarily agree that it's overkill to remove and inspect at every annual. I think the oil filter should be replaced at least every 50 hours, not as much because the filter won't filter as well after so many hours (although that is certainly part of it), but to monitor engine wear based on what is in the filter. A problem in the tank could possibly be detected if there was excess material in the fuel filter, even though it may not have much chance of getting completely clogged.
do not archive
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
C: 352-427-0285
F: 815-377-3694
On Nov 17, 2010, at 11:44 PM, DLM wrote:
| Quote: | At the second annual, we removed, cleaned, installed and leak tested the filter. TT was 265 hours. I believe I posted the pictures at that time. A few tiny black specks were found. The fuel filter was in excess of 99% completely clean and clear which suggests to me that unless an aircraft fuel tanks were not cleared of proseal after construction little will be found in the filter. A more likely problem could occur at the screens that may clog in each tank. As Kelly said there is a bypass anyway if the primary filter becomes clogged. Simply put, removing and cleaning the fuel filter at every annual is , in my judgment, overkill.
| Quote: |
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speckter(at)comcast.net
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| Posted: Thu Nov 18, 2010 6:05 am Post subject: fuel filter maintenance |
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At each annual I do not remove my fuel filter. Instead I disconnect the fuel line at the servo and turn on the fuel pump and measure the fuel flow. Mine flows 42gph when clean. If I do a fuel flow and it is less than that, I remove the filter and clean, which I haven’t had to do yet, all is clean. A fuel flow is a lot easier to do than filter removal with the accompanied tube jockeying and body contortions. Filters do not clog instantaneously but slow in flow over time as debris accumulates.
Gary Specketer
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Jesse Saint
Sent: Thursday, November 18, 2010 12:10 AM
To: rv10-list(at)matronics.com
Subject: Re: fuel filter maintenance
I do agree that it is very unlikely that the filter will become clogged, although I don't necessarily agree that it's overkill to remove and inspect at every annual. I think the oil filter should be replaced at least every 50 hours, not as much because the filter won't filter as well after so many hours (although that is certainly part of it), but to monitor engine wear based on what is in the filter. A problem in the tank could possibly be detected if there was excess material in the fuel filter, even though it may not have much chance of getting completely clogged.
do not archive
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
C: 352-427-0285
F: 815-377-3694
On Nov 17, 2010, at 11:44 PM, DLM wrote:
At the second annual, we removed, cleaned, installed and leak tested the filter. TT was 265 hours. I believe I posted the pictures at that time. A few tiny black specks were found. The fuel filter was in excess of 99% completely clean and clear which suggests to me that unless an aircraft fuel tanks were not cleared of proseal after construction little will be found in the filter. A more likely problem could occur at the screens that may clog in each tank. As Kelly said there is a bypass anyway if the primary filter becomes clogged. Simply put, removing and cleaning the fuel filter at every annual is , in my judgment, overkill.
| Quote: | | href="http://www.aeroelectric.com/">www.aeroelectric.comhref="http://www.buildersbooks.com/">www.buildersbooks.comhref="http://www.homebuilthelp.com/">www.homebuilthelp.comhref="http://www.matronics.com/contribution">http://www.matronics.com/contributionhref="http://www.matronics.com/Navigator?RV10-List">http://www.matronics.com/Navigator?RV10-Listhref="http://forums.matronics.com/">http://forums.matronics.com |
[quote]
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href="http://forums.matronics.com">http://forums.matronics.com
[b]
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dave.saylor.aircrafters(a
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| Posted: Thu Nov 18, 2010 6:46 am Post subject: fuel filter maintenance |
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Gary,
| Quote: | >Filters do not clog instantaneously but slow in flow over time as debris accumulates<<
|
Have you tested that theory with your specific filter? And, I wonder
what role the bypass valve plays.
I'd go along with your method if you could show that a filter blocked,
say, 10% gave a correspondingly low fuel flow, but caution tells me
that you won't see the flow drop off until the blockage is
significant. And wouldn't an open bypass valve restore the fuel flow
to something like normal?
Dave Saylor
AirCrafters
140 Aviation Way
Watsonville, CA 95076
831-722-9141 Shop
831-750-0284 Cell
On Thu, Nov 18, 2010 at 6:01 AM, gary <speckter(at)comcast.net> wrote:
| Quote: | At each annual I do not remove my fuel filter.  Instead I disconnect the
fuel line at the servo and turn on the fuel pump and measure the fuel flow.
Mine flows 42gph when clean. If I do a fuel flow and it is less than that, I
remove the filter and clean, which I haven’t had to do yet, all is clean. A
fuel flow is a lot easier to do than filter removal with the accompanied
tube jockeying and body contortions. Filters do not clog instantaneously
but slow in flow over time as debris accumulates.
Gary Specketer
________________________________
From: owner-rv10-list-server(at)matronics.com
[mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Jesse Saint
Sent: Thursday, November 18, 2010 12:10 AM
To: rv10-list(at)matronics.com
Subject: Re: fuel filter maintenance
I do agree that it is very unlikely that the filter will become clogged,
although I don't necessarily agree that it's overkill to remove and inspect
at every annual. Â I think the oil filter should be replaced at least every
50 hours, not as much because the filter won't filter as well after so many
hours (although that is certainly part of it), but to monitor engine wear
based on what is in the filter. Â A problem in the tank could possibly be
detected if there was excess material in the fuel filter, even though it may
not have much chance of getting completely clogged.
do not archive
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com
C: 352-427-0285
F: 815-377-3694
On Nov 17, 2010, at 11:44 PM, DLM wrote:
At the second annual, we removed, Â cleaned, installed and leak tested the
filter. TT was 265 hours. I believe I posted the pictures at that time. A
few tiny black specks were found. The fuel filter was in excess of 99%
completely clean and clear which suggests to me that unless an aircraft fuel
tanks were not cleared of proseal after construction little will be found in
the filter. A more likely problem could occur at the screens that may clog
in each tank. As Kelly said there is a bypass anyway if the primary filter
becomes clogged. Simply put, removing and cleaning the fuel filter at every
annual is , in my judgment, overkill.
href="http://www.aeroelectric.com/">www.aeroelectric.com
href="http://www.buildersbooks.com/">www.buildersbooks.com
href="http://www.homebuilthelp.com/">www.homebuilthelp.com
href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
href="http://www.matronics.com/Navigator?RV10-List">http://www.matronics.com/Navigator?RV10-List
href="http://forums.matronics.com/">http://forums.matronics.com
href="http://www.aeroelectric.com">www.aeroelectric.com
href="http://www.buildersbooks.com">www.buildersbooks.com
href="http://www.homebuilthelp.com">www.homebuilthelp.com
href="http://www.matronics.com/contribution">http://www.matronics.com/chref="http://www.matronics.com/Navigator?RV10-List">http://www.matronics.com/Navigator?RV10-List
href="http://forums.matronics.com">http://forums.matronics.com
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jesse(at)saintaviation.co
Guest
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| Posted: Thu Nov 18, 2010 7:06 am Post subject: fuel filter maintenance |
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I don't think the bypass valve in the system bypasses the filter. It is a pressure relief valve so if the boost pump is putting out more pressure than the relief valve is set to handle, it routes some of the fuel from the pressure side of the pump back to the non-presure side of the pump.
do not archive
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com
C: 352-427-0285
F: 815-377-3694
On Nov 18, 2010, at 9:43 AM, Dave Saylor wrote:
| Quote: |
Gary,
>> Filters do not clog instantaneously but slow in flow over time as debris accumulates<<
Have you tested that theory with your specific filter? And, I wonder
what role the bypass valve plays.
I'd go along with your method if you could show that a filter blocked,
say, 10% gave a correspondingly low fuel flow, but caution tells me
that you won't see the flow drop off until the blockage is
significant. And wouldn't an open bypass valve restore the fuel flow
to something like normal?
Dave Saylor
AirCrafters
140 Aviation Way
Watsonville, CA 95076
831-722-9141 Shop
831-750-0284 Cell
On Thu, Nov 18, 2010 at 6:01 AM, gary <speckter(at)comcast.net> wrote:
> At each annual I do not remove my fuel filter. Instead I disconnect the
> fuel line at the servo and turn on the fuel pump and measure the fuel flow.
> Mine flows 42gph when clean. If I do a fuel flow and it is less than that, I
> remove the filter and clean, which I haven’t had to do yet, all is clean. A
> fuel flow is a lot easier to do than filter removal with the accompanied
> tube jockeying and body contortions. Filters do not clog instantaneously
> but slow in flow over time as debris accumulates.
>
>
>
> Gary Specketer
>
>
>
> ________________________________
>
> From: owner-rv10-list-server(at)matronics.com
> [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Jesse Saint
> Sent: Thursday, November 18, 2010 12:10 AM
> To: rv10-list(at)matronics.com
> Subject: Re: fuel filter maintenance
>
>
>
> I do agree that it is very unlikely that the filter will become clogged,
> although I don't necessarily agree that it's overkill to remove and inspect
> at every annual. I think the oil filter should be replaced at least every
> 50 hours, not as much because the filter won't filter as well after so many
> hours (although that is certainly part of it), but to monitor engine wear
> based on what is in the filter. A problem in the tank could possibly be
> detected if there was excess material in the fuel filter, even though it may
> not have much chance of getting completely clogged.
>
>
>
> do not archive
>
>
>
> Jesse Saint
> Saint Aviation, Inc.
> jesse(at)saintaviation.com
> C: 352-427-0285
> F: 815-377-3694
>
>
>
> On Nov 17, 2010, at 11:44 PM, DLM wrote:
>
> At the second annual, we removed, cleaned, installed and leak tested the
> filter. TT was 265 hours. I believe I posted the pictures at that time. A
> few tiny black specks were found. The fuel filter was in excess of 99%
> completely clean and clear which suggests to me that unless an aircraft fuel
> tanks were not cleared of proseal after construction little will be found in
> the filter. A more likely problem could occur at the screens that may clog
> in each tank. As Kelly said there is a bypass anyway if the primary filter
> becomes clogged. Simply put, removing and cleaning the fuel filter at every
> annual is , in my judgment, overkill.
>
>
>
>
>
> href="http://www.aeroelectric.com/">www.aeroelectric.com
>
> href="http://www.buildersbooks.com/">www.buildersbooks.com
>
> href="http://www.homebuilthelp.com/">www.homebuilthelp.com
>
> href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
>
> href="http://www.matronics.com/Navigator?RV10-List">http://www.matronics.com/Navigator?RV10-List
>
> href="http://forums.matronics.com/">http://forums.matronics.com
>
>
>
> href="http://www.aeroelectric.com">www.aeroelectric.com
> href="http://www.buildersbooks.com">www.buildersbooks.com
> href="http://www.homebuilthelp.com">www.homebuilthelp.com
> href="http://www.matronics.com/contribution">http://www.matronics.com/chref="http://www.matronics.com/Navigator?RV10-List">http://www.matronics.com/Navigator?RV10-List
> href="http://forums.matronics.com">http://forums.matronics.com
>
>
>
|
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kdbelue(at)charter.net
Guest
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| Posted: Thu Nov 18, 2010 7:06 am Post subject: fuel filter maintenance |
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There isn't a bypass for the filter.....
Sent from my iPhone
On Nov 18, 2010, at 8:43 AM, Dave Saylor <dave.saylor.aircrafters(at)gmail.com> wrote:
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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dave.saylor.aircrafters(a
Guest
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| Posted: Thu Nov 18, 2010 11:08 am Post subject: fuel filter maintenance |
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Oops. I thought I remembered the conical spring being part of a
bypass but apparently not. But I still wouldn't use FF as a measure
of how clogged the filter is.
I felt silly for talking about the filter bypass so I read up on the
whole pump assembly. It seems to run a lot more fuel through itself
than what the engine uses. It uses the excess fuel to cool the pump.
So if your filter isn't letting a ton of fuel through, even though
you're still seeing adequate fuel flow, a partially clogged filter may
be limiting how much excess fuel is available to cool the pump.
Dave Saylor
AirCrafters
140 Aviation Way
Watsonville, CA 95076
831-722-9141 Shop
831-750-0284 Cell
On Thu, Nov 18, 2010 at 6:57 AM, Kevin Belue <kdbelue(at)charter.net> wrote:
| Quote: |
There isn't a bypass for the filter.....
Sent from my iPhone
On Nov 18, 2010, at 8:43 AM, Dave Saylor <dave.saylor.aircrafters(at)gmail.com> wrote:
>
|
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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