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  #11  
Old 09-16-2014, 03:56 PM
Tom Martin Tom Martin is offline
 
Join Date: Jan 2005
Location: Ontario, Canada
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I am going to keep plugging my floor inspection panel. We are supposed to check these filters at least once a year, more if you fly a lot of hours. Making it EASY to check will greatly improve the odds of this important job being done. There is no sump on this filter as there is with a gascolator and so the only way to know if there is **** in it is to take it out and have a look at it. With a new airplane you should likely do that in the first 5 or 10 hours just to make sure that there is no fuel tank construction residue.
There are quite a few a screws in that tunnel cover and the tunnel cover is underneath the panel. Yes it is doable but it is not a quick job. Also, if the cover is painted you will eventually ruin that nice paint around the screw holes.
It will take one to two hours to make an inspection panel in the bottom of the fuselage. You will get that time back on your first inspection.

For that matter put some extra inspection panels over the step attach points. This will make this inspection very easy.

Inspection panels not only make inspections easy but they make them happen.
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  #12  
Old 09-16-2014, 04:15 PM
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9GT 9GT is offline
 
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I decided against an inspection/maintenance panel to service my AFP filter in the tunnel. I want to remove the forward tunnel cover to inspect all the fuel fittings under there without using mirrors or inspection cameras. I noticed a decrease in my fuel pressure after the first 60 hours. It took me about 30 minutes to remove the seats, tunnel carpet cover, forward tunnel cover and the filter. About the same for reassembly. I was surprised to find quite a bit of junk in the filter screen but happy I could do a thorough inspection of everything while I was doing the service.
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  #13  
Old 09-16-2014, 04:50 PM
jchang10 jchang10 is offline
 
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Location: San Francisco, CA
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Also, i just had my fuel selector fail due to crud that seized the valve. I am thinking about putting a couple of inline fuel filters in each wing root now.
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  #14  
Old 09-16-2014, 05:35 PM
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BlackhawkSP BlackhawkSP is offline
 
Join Date: Jun 2011
Location: Indianapolis
Posts: 228
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Quote:
Originally Posted by digidocs View Post
Hi VAF,

Would the VAF braintrust have a look at my fuel system layout below and let me know what you think?

A few specific questions:

- Is this setup too rigid? There is compliance in the big z-bend tube on the firewall end, but the other tubes are short and straight enough that they are pretty stiff. If I use Van's supplied pipe clamps to lock everything into mounts riveted to the floor, am I locking in stresses due to slight misalignments and flexural stress from vibration?

- If this setup is too rigid, any suggestions on alternate configurations that would be better? The new AFP fuel pump is longer than the old one and my fuel valve is mounted a but more forward, so I'm a bit constrained on space.

- Any other things that could be better?





Thanks for the help!
David
David:

It looks OK to me. If you want to get rid of the short piece of tubing and the 2 flares between the filter and the pump you can use a swivel coupling like this:
http://www.jegs.com/i/JEGS-Performan...oductId=752566

I needed the shorter length, because I put my flowmeter in the tunnel too. I just today finished the access panel on the right side. Pictures are as follows:





Good luck on your build.
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  #15  
Old 09-16-2014, 05:53 PM
BillL BillL is offline
 
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Location: Central IL
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The inline positioning is certainly clean looking, but before you move on, try and remove just one of the devices in that line. With short pipes, and flared ends, it is like Jenga with"I" shaped blocks.
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  #16  
Old 09-17-2014, 10:43 AM
Bart Bart is offline
 
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Location: Pecan Plantation (0TX1)
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My 2 cents which is not much when compared to most folks on this site. I used stainless flex lines with the aeroquip fire sleeves on my tunnel fuel lines. It was expensive but gave me great peace of mind. Additionally based on 6 annuals I would install the side access panel. It provides great ease of access to the system.
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