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Finger Strainer

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mritter509(at)msn.com
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Posted: Thu Oct 25, 2007 2:17 pm Post subject: Finger Strainer

After 150 hours the finger strainer in the right tank sprung a leak.  Removed the fitting, cleaned the threads, applied fuelube and reinstalled.  Still leaked.  Put in new fitting and the leaked stopped.  Go figure.

  

 I was getting a faint wiff of avgas in the cabin that caused me to investigate.  Found fuel stains on the bottom right wing fairing.  After draining the right tank we place a balloon on the fuel vent line and put air in the tank via the fuel drain fitting.  We then put liquid soap where we believed the leak was and found bubbles around the finger strainer.

  

 Mark

 RV-10/N410MR



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Tim Olson

Joined: 25 Jan 2007
Posts: 2879

Posted: Thu Oct 25, 2007 5:06 pm Post subject: Finger Strainer

I've seen brass valves and NPT fittings fail getting hairline

cracks in them pretty easily before.  Probably was caused

just during torquing initially, as I know those finger strainers

can be a pain to tighten...then finally with the tension

on it, it finally made a hairline crack.  That's great that you

found it and did all the right things diagnosing.  You probably

won't have an issue again I'd bet.



Tim Olson - RV-10 N104CD - Flying

do not archive

Mark Ritter wrote:

 	  Quote: 	
		   After 150 hours the finger strainer in the right tank sprung a leak.  

 Removed the fitting, cleaned the threads, applied fuelube 

 and reinstalled.  Still leaked.  Put in new fitting and the leaked 

 stopped.  Go figure.

  

 I was getting a faint wiff of avgas in the cabin that caused me to 

 investigate.  Found fuel stains on the bottom right wing fairing.  After 

 draining the right tank we place a balloon on the fuel vent line and put 

 air in the tank via the fuel drain fitting.  We then put liquid 

 soap where we believed the leak was and found bubbles around the finger 

 strainer.

  

 Mark

 RV-10/N410MR

 

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AV8ORJWC

Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"

Posted: Thu Oct 25, 2007 5:28 pm Post subject: Finger Strainer

Incorrect Torque values and improper torqueing techniques contribute to

more problems than you can imagine.  Good N' Tight sure has a price in

terms of damage in an aircraft environment.  All of this is often

glossed over when reading the AC43.13 until a problem becomes apparent

after the damage was done on initial torqueing.



Be sure to use installation techniques which allow for regular and easy

inspection.  Use materials which do not contribute to toxic fumes or

dissolve in the presence of AVGAS staining.  Know the materials you are

using help the solution and don't amplify a potential problem.



John Cox - N49CX - Dreaming of flying like the Olson Clan



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