Mailing List flyrotary@lancaironline.net Message #19312
From: Russell Duffy <13brv3@bellsouth.net>
Subject: RE: [FlyRotary] Re: Fuel system Sketch Rev1
Date: Wed, 23 Mar 2005 09:35:37 -0600
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>
Message
Note that fuel system threads are one of our most popular, and everyone has an opinion.  
 
I think the fuel filter threads are Saginaw not NPT.   
 
LOL!  I meant threads as in message subjects :-)     
 
Mark Steitle reported and I observed his engine would restart after running a tank dry and switching to the other with the bypass in place. It would not restart before this without releasing pressure ahead of the pump.   
 
I'll give you this one, especially if your pumps are not low in the system so gravity can feed them.  
 
Twice in my life I have experienced partially clogged fuel filters in a car. Of course I was much younger and I am sure they was not serviced properly. The idea was to provide redundancy so either pump could use either (both) filters. Also a nice place for sensors. However, it added extra connections. :( 
 
We could play a hundred what-if questions, but say you get some crud in your tanks.  You're flying along, slowly filling up both filters.  Eventually, you start to lose fuel pressure, so you turn on the 2nd pump.  It has to pump through the same two clogged filters, so no joy.  That's why I'd put one filter on each pump, but that's just my preference. 
 
Education and recreation right? 
 
That's what they say, but I only get the education part :-)
 
Rusty (good autotune testing weather approaching) 
 
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