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fuel filter

 
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dlm34077(at)gmail.com
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PostPosted: Fri Mar 22, 2019 8:52 am    Post subject: fuel filter Reply with quote

Has anyone disassembled the in tunnel fuel filter? Has anyone found anything of significance? I disassembled at about 500 hours and found 1-2 grains of carbon.
David 
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rleffler



Joined: 05 Nov 2006
Posts: 647

PostPosted: Fri Mar 22, 2019 9:30 am    Post subject: fuel filter Reply with quote

I do at every other condition inspection. Ive yet to find any debris in the screen.



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From: owner-rv10-list-server(at)matronics.com on behalf of dlm <dlm34077(at)gmail.com>
Sent: Friday, March 22, 2019 1:02 PM
To: rv10-list(at)matronics.com
Subject: fuel filter

Has anyone disassembled the in tunnel fuel filter? Has anyone found anything of significance? I disassembled at about 500 hours and found 1-2 grains of carbon.


David


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PostPosted: Fri Mar 22, 2019 9:58 am    Post subject: fuel filter Reply with quote

I have never found anything in the tunnel filter in 1340 hrs.


Quote:
On Mar 22, 2019, at 12:50 PM, dlm <dlm34077(at)gmail.com (dlm34077(at)gmail.com)> wrote:
Has anyone disassembled the in tunnel fuel filter? Has anyone found anything of significance? I disassembled at about 500 hours and found 1-2 grains of carbon.

David

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gspecketer(at)gmail.com
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PostPosted: Fri Mar 22, 2019 10:19 am    Post subject: fuel filter Reply with quote

I do a flow test every annual. Much easier than getting at the filter to remove it.



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From: owner-rv10-list-server(at)matronics.com on behalf of dlm <dlm34077(at)gmail.com>
Sent: Friday, March 22, 2019 11:57 AM
To: rv10-list(at)matronics.com
Subject: fuel filter

Has anyone disassembled the in tunnel fuel filter? Has anyone found anything of significance? I disassembled at about 500 hours and found 1-2 grains of carbon.


David


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dmaib(at)mac.com
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PostPosted: Fri Mar 22, 2019 1:42 pm    Post subject: fuel filter Reply with quote

1100 hours and it’s always clean as can be. I’m going to incorporate Gary’s plan and do a fuel flow test instead of pulling the filter every year. I’m always concerned that I’ll ding up a fitting and wind up with a leaking fuel line in the tunnel.

David Maib

On Mar 22, 2019, at 12:50, dlm <dlm34077(at)gmail.com (dlm34077(at)gmail.com)> wrote:
Quote:
Has anyone disassembled the in tunnel fuel filter? Has anyone found anything of significance? I disassembled at about 500 hours and found 1-2 grains of carbon.
David
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neilekins(at)aol.com
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PostPosted: Fri Mar 22, 2019 1:45 pm    Post subject: fuel filter Reply with quote

What flow are you looking for when you flow test?

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On Mar 22, 2019, at 2:17 PM, Gary Specketer <gspecketer(at)gmail.com (gspecketer(at)gmail.com)> wrote:
Quote:
I do a flow test every annual. Much easier than getting at the filter to remove it.



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From: owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com) on behalf of dlm <dlm34077(at)gmail.com (dlm34077(at)gmail.com)>
Sent: Friday, March 22, 2019 11:57 AM
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Subject: fuel filter

Has anyone disassembled the in tunnel fuel filter? Has anyone found anything of significance? I disassembled at about 500 hours and found 1-2 grains of carbon.


David


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gengrumpy



Joined: 07 May 2013
Posts: 128
Location: Tullahoma, TN

PostPosted: Fri Mar 22, 2019 5:17 pm    Post subject: fuel filter Reply with quote

That is a very sound idea. In 12 ACIs on my bird, I have found zero - repeat zero - particulates in the filter. But tearing open the tunnel to remove the filter creates lots of potential problems…….
Quote:
On Mar 22, 2019, at 4:41 PM, David Maib <dmaib(at)mac.com (dmaib(at)mac.com)> wrote:
1100 hours and it’s always clean as can be. I’m going to incorporate Gary’s plan and do a fuel flow test instead of pulling the filter every year. I’m always concerned that I’ll ding up a fitting and wind up with a leaking fuel line in the tunnel. David Maib

On Mar 22, 2019, at 12:50, dlm <dlm34077(at)gmail.com (dlm34077(at)gmail.com)> wrote:
Quote:
Has anyone disassembled the in tunnel fuel filter? Has anyone found anything of significance? I disassembled at about 500 hours and found 1-2 grains of carbon.

David

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PostPosted: Sat Mar 23, 2019 3:53 am    Post subject: fuel filter Reply with quote

After thinking about fuel flow, I have multiple checks per flight. FF at takeoff should be 23-25 gph with normal CHT and EGT. Normal LOP FF should be about 9-10 gph at about 60%; hence the health of the filter is implied each flight. If the boost pump is left ON, the LOP FF will be about 9-10 gph but the engine may be rough or abnormal CHT or EGT.
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woxofswa



Joined: 12 Aug 2008
Posts: 348
Location: AZ

PostPosted: Tue Mar 26, 2019 12:41 pm    Post subject: Re: fuel filter Reply with quote

I’ve never found anything and my fuel consumed is significantly Mexican. It seems a little redundant along with the other filters that the fuel goes through from refinery to throttle. I also worry about creating ancillary problems trying to overly cautious. I think it’s important to do a new build often and early for construction FOD, but not as often in a proven system.
I’ would think you could drop a marble into the filter tube itself and not noticeably change the fuel flow indication. Most blockages I’ve heard of came from improper use of Teflon tape.


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Bob Turner



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PostPosted: Tue Mar 26, 2019 1:21 pm    Post subject: Re: fuel filter Reply with quote

woxofswa wrote:
Most blockages I’ve heard of came from improper use of Teflon tape.

.....and RTV.


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Greg McFarlane



Joined: 12 Apr 2012
Posts: 43
Location: Albany Western Australia

PostPosted: Wed Mar 27, 2019 12:25 am    Post subject: Re: fuel filter Reply with quote

The only thing I’ve ever seen in the filter was a tiny amount of what looked like whispy thread as in cotton thread type material. Turns out others have seen this to and the consensus is that it is minuscule shedding of material from the bowser fuel filters before it enters our tanks. I’ve only seen it once in three annuals, and again the consensus is that it’s likely the filter changes at the fuel point were at the due for change period. Not much we can do about that sort of contamination except to be aware and question the service times of your most used local fuel source. Cheers from Western Australia

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civengpe



Joined: 14 Feb 2011
Posts: 105

PostPosted: Wed Mar 27, 2019 5:32 am    Post subject: fuel filter Reply with quote

This is what our fuel filter looked like after about 350 hours.  We had noticed hot starts were getting harder, but no fuel flow issues at WOT or in flight.  We were pretty shocked by this when we saw it.  It is completely covered by a fine, white powder that came off with compressed air. Made a remarkable difference in starting behavior.  Well that and the Surefly ignition Wink

Plane lives in a hanger and flies off of a paved runway.  
Sorry, I don't have any after photos.   

[img]cid:ii_jtr7g1sx1[/img]


Shannon

On Tue, Mar 26, 2019 at 4:26 PM Bob Turner <bobturner(at)alum.rpi.edu (bobturner(at)alum.rpi.edu)> wrote:

Quote:
--> RV10-List message posted by: "Bob Turner" <bobturner(at)alum.rpi.edu (bobturner(at)alum.rpi.edu)>


woxofswa wrote:
> Most blockages I’ve heard of came from improper use of Teflon tape.

....and RTV.

--------
Bob Turner
RV-10 QB




Read this topic online here:

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PostPosted: Wed Mar 27, 2019 5:42 am    Post subject: fuel filter Reply with quote

must have had contamination in the fuel tanks to begin with.



Quote:
On Mar 27, 2019, at 8:56 AM, Shannon Hicks <civeng123(at)gmail.com (civeng123(at)gmail.com)> wrote:
This is what our fuel filter looked like after about 350 hours. We had noticed hot starts were getting harder, but no fuel flow issues at WOT or in flight. We were pretty shocked by this when we saw it. It is completely covered by a fine, white powder that came off with compressed air. Made a remarkable difference in starting behavior. Well that and the Surefly ignition Wink
Plane lives in a hanger and flies off of a paved runway.

Sorry, I don't have any after photos.
<5685815741.jpg>
Shannon
On Tue, Mar 26, 2019 at 4:26 PM Bob Turner <bobturner(at)alum.rpi.edu (bobturner(at)alum.rpi.edu)> wrote:
Quote:
--> RV10-List message posted by: "Bob Turner" <bobturner(at)alum.rpi.edu (bobturner(at)alum.rpi.edu)> woxofswa wrote: > Most blockages I’ve heard of came from improper use of Teflon tape. ....and RTV. -------- Bob Turner RV-10 QB Read this topic online here: http://forums.matronics.com/viewtopic.php?p=488275#488275 =========== -List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?RV10-List =========== FORUMS - eferrer" target="_blank">http://forums.matronics.com =========== WIKI - errer" target="_blank">http://wiki.matronics.com =========== b Site - -Matt Dralle, List Admin. rel="noreferrer" target="_blank">http://www.matronics.com/contribution ===========




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Kelly McMullen



Joined: 16 Apr 2008
Posts: 1130
Location: Sun Lakes AZ

PostPosted: Wed Mar 27, 2019 6:38 am    Post subject: fuel filter Reply with quote

I this points out that the first couple condition inspections should have a check of this filter. After that, base interval on previous results.
I don't think it is a good idea to go much past 100 hours before first inspection of the fuel filter, because of likely fuel sealant or other contamination bits coming out.

Quote:
Sent from my TRS-80 Model 100



On Wed, Mar 27, 2019 at 6:39 AM Shannon Hicks <civeng123(at)gmail.com (civeng123(at)gmail.com)> wrote:

Quote:
This is what our fuel filter looked like after about 350 hours.  We had noticed hot starts were getting harder, but no fuel flow issues at WOT or in flight.  We were pretty shocked by this when we saw it.  It is completely covered by a fine, white powder that came off with compressed air. Made a remarkable difference in starting behavior.  Well that and the Surefly ignition Wink

Plane lives in a hanger and flies off of a paved runway.  
Sorry, I don't have any after photos.   
Shannon


Quote:




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