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  #21  
Old 01-14-2014, 08:50 PM
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rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
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Quote:
Originally Posted by sonny-m View Post
I am just wondering what is actually causing the crazing. Could it be that nasty corn stuff they put in auto fuel that the rear window doesn't like.
Yes. That seems to be the primary problem.
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Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
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  #22  
Old 01-14-2014, 09:02 PM
gossend gossend is offline
 
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Location: Georgetown, Texas
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Unhappy Nasty corn stuff and Proseal

Scott, I think I've picked up somewhere that the ethanol in our fuel attacks Pro Seal. Any evidence of that? Hope not.
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  #23  
Old 01-14-2014, 10:53 PM
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rvbuilder2002 rvbuilder2002 is offline
 
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Scott, I think I've picked up somewhere that the ethanol in our fuel attacks Pro Seal. Any evidence of that? Hope not.
Not that it does, but it can. but is dependent on numerous factors.

It has been discussed here in the forum previously. The most critical factor is time. Do not let ethanol fuel sit in the tank during periods of extended storage.

Van's official position was published in Sevice Bulliten 13-3-21 located HERE
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Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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  #24  
Old 01-15-2014, 07:51 AM
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WingedFrog WingedFrog is offline
 
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Location: Raleigh, NC
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Quote:
Originally Posted by rvbuilder2002 View Post
Not that it does, but it can. but is dependent on numerous factors.

It has been discussed here in the forum previously. The most critical factor is time. Do not let ethanol fuel sit in the tank during periods of extended storage.

Van's official position was published in Sevice Bulliten 13-3-21 located HERE
Sevice Bulletin: typo or Freudian slip?
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Kit # 120395 N124BX
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  #25  
Old 01-15-2014, 10:44 AM
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rvbuilder2002 rvbuilder2002 is offline
 
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Sevice Bulletin: typo or Freudian slip?
You guys hold me to a pretty high standard (perfection?), don't you?

Just click on the link... it should make it clear enough...
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Hubbard, Oregon
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  #26  
Old 01-15-2014, 01:24 PM
dick seiders dick seiders is offline
 
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Scott, I am not trying to give you a hard time as I really appreciate all you do for us. Following your comment on expansion I was curious so checked it out. If one filled to a full 19.8 gal AND there was a 15 degree C increase in temp after the tank fuel would expand to 36 oz more and overflow a little at the fill neck. So you are correct when those circumstances occur. I normally shoot for 18 to 19 gal as I don't like overflows, and even with a big bump in temp. after the fill no problem. However I never before appreciated the role played by temp increases in the equation. Food for thought.
Dick Seiders
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  #27  
Old 01-15-2014, 03:19 PM
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rvbuilder2002 rvbuilder2002 is offline
 
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Originally Posted by dick seiders View Post
Scott, I am not trying to give you a hard time as I really appreciate all you do for us. Following your comment on expansion I was curious so checked it out. If one filled to a full 19.8 gal AND there was a 15 degree C increase in temp after the tank fuel would expand to 36 oz more and overflow a little at the fill neck. So you are correct when those circumstances occur. I normally shoot for 18 to 19 gal as I don't like overflows, and even with a big bump in temp. after the fill no problem. However I never before appreciated the role played by temp increases in the equation. Food for thought.
Dick Seiders
It is not uncommon for even more temp change than that... cold fuel pumped from an under ground tank in the morning, and then the airplane sits in the sun all day at a fly-in. Couple that with a situation where the tank was 100% topped off (either accidently, or on purpose, for departure on a long cross country leg towards home) and it is very easy to have happen.
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.

Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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  #28  
Old 01-25-2014, 10:14 PM
Mark Henderson Mark Henderson is offline
 
Join Date: Oct 2008
Location: Napa, Calif
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I was wondering why the fuel vent has an air line as well as the vent line? I will be installing it soon, but was curious why the second line. I don't mean this to sound like a criticism of the engineering. I just like to know as much as I can about my airplane and how and why it works. Anyone have an answer? Thanks.
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  #29  
Old 01-26-2014, 05:14 AM
mrt890 mrt890 is offline
 
Join Date: May 2008
Location: Friday Harbor, Wa
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The second smaller line is a siphon breaker(preventer)
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  #30  
Old 01-26-2014, 08:45 AM
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Jetguy Jetguy is offline
 
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Quote:
The second smaller line is a siphon breaker(preventer)
To add just a little bit more. Consider you are going on a long x-country and you fill the tank all the way up to the top of your filler neck then your fuel would be higher than the vent hose so a siphon could occur.
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