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  #11  
Old 05-13-2015, 03:22 PM
Timbeck2 Timbeck2 is offline
 
Join Date: Apr 2015
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I took a shot. I'll um.....be back in the corner reading if ya need me.
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  #12  
Old 05-13-2015, 04:18 PM
noelf noelf is offline
 
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IN and OUT on the primer solenoid are reversed from recommended directions.
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  #13  
Old 05-13-2015, 04:31 PM
jrs14855 jrs14855 is offline
 
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Default Copper Tubing

Copper tubing was used extensively by light aircraft manufacturers well into the 50's maybe later. Perhaps most commonly found on Pipers. Nearly all the Piper hoses, lines fittings etc in the 40's and 50's was non aircraft.
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  #14  
Old 05-13-2015, 06:10 PM
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flyboy1963 flyboy1963 is offline
 
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Default the solution???

...so, if all my primer lines are copper, what's the better practice?
Is aluminum better somehow?

seems other hi-temp materials are already 'hard', stainless, steel....so should they be tiny firesleeved flex lines?

inquiring minds need to know!
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  #15  
Old 05-13-2015, 11:33 PM
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rvbuilder2002 rvbuilder2002 is offline
 
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Quote:
Originally Posted by Walt View Post
That was quick and Mike wins a beer at Osh!
This picture makes it a little clearer whats going on... the feed is from the back like Mike indicated, this was just acting large pass through heat sink, with no filtering.
The worst part is this was on a very old RV6 with sloshed tanks and this was the only filter except for the carb inlet where I found debris, been overlooked for probably 20+ years
(true teflon tape is also a good find and missing firesleeve clamps)

Either the airplane isn't actually 20 years old or the fuel system has been upgraded, because that version of the gascolator has only be availabe for about 10 years or so.
Regardless, I guess who ever installed it was totally blind to the arrows.
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  #16  
Old 05-13-2015, 11:37 PM
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rvbuilder2002 rvbuilder2002 is offline
 
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Quote:
Originally Posted by jrs14855 View Post
Copper tubing was used extensively by light aircraft manufacturers well into the 50's maybe later. Perhaps most commonly found on Pipers. Nearly all the Piper hoses, lines fittings etc in the 40's and 50's was non aircraft.
Actually Piper was still using it at least into the early 80's on there primer systems.
Installed correctly, it is a valid method, though it seems to always require more than its share of repairs/maint.
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  #17  
Old 05-14-2015, 04:20 AM
FredMagare FredMagare is offline
 
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Is that Teflon tape on the connections?
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  #18  
Old 05-14-2015, 05:25 AM
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catmandu catmandu is offline
 
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I was about to make a snide comment, but then I realized I learned a thing or two (or three ) on this thread.

Note to self: hold the snide comments until you have been turning wrenches on airplanes more than a couple years, noob!
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  #19  
Old 05-14-2015, 06:05 AM
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Danny King Danny King is offline
 
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Default Gascolator

The fix would be to install a decent filter and eliminate the un-necessary gascolator. On the trail dragging RV-6 the low point in the fuel system is the tank drains, so a gascolator mounted anywhere on the firewall is up-hill from the low point and only serves as a poor filter and a heat sink for vapor lock.

There is a lot of grandfather worship in what some builders do. Certified Grumman aircraft, like the AA1-A Yankee I owned for 23 years, do not have gascolators for the same reason. The low point in the fuel system is the tank drains.
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  #20  
Old 05-14-2015, 08:21 AM
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rvbuilder2002 rvbuilder2002 is offline
 
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Quote:
Originally Posted by Danny King View Post
The low point in the fuel system is the tank drains.
On an RV-7 or 9 with a fuel system built per plans the system low spot is the line running between the fuel selector valve and the gascolator (on airplanes with carbed engines).
Gascolators were never specifically designed to only be installed at system low points (though they are sometimes installed that way). By design, they induce an artificial low point in the system. The tank drains are the best first line of defense for removing water and contaminants but it is not a guarantee because water and contaminants can get trapped in outer bays of the fuel tank and only makes its way to the area of the tank drains in flight. It is for that reason it is a good idea to have something downstream in the fuel system to capture water, etc.
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RV-6A (aka "Junkyard Special ")
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