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  #1  
Old 02-07-2019, 12:06 PM
n74846 n74846 is offline
 
Join Date: Sep 2015
Location: Boca Raton, FL BCT
Posts: 117
Default Gas Vapor Stain on Canopy Cover

As one of those who tie down, I use a Bruce's canopy cover for protection. Over the years a large black vapor stain has appeared over the vented fuel cap. It looks like black mold. I contacted Bruce's about it and they say they have never heard of it nor received a comment/complaint about it.

For those who use a cover, have you had/seen a similar stain? I cannot believe I am the only one in the fleet to experience this. Thanks.
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  #2  
Old 02-07-2019, 04:59 PM
BlndRvtr BlndRvtr is offline
 
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What type of fuel?

George
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  #3  
Old 02-08-2019, 01:05 PM
Hotscam Hotscam is offline
 
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Same here on both our 12s
Fill the tank and temperature rise will make the vented cap to overflow.
Large blackish stains !!
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Old 02-08-2019, 02:48 PM
n74846 n74846 is offline
 
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I only use Costco Avgas. And don't recall it being filled to a point where it ever overflows.
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  #5  
Old 02-08-2019, 04:21 PM
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Piper J3 Piper J3 is offline
 
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Quote:
Originally Posted by n74846 View Post
I only use Costco Avgas. And don't recall it being filled to a point where it ever overflows.
May not have to overflow to cause your problem. In fact, partially filled tank may be more of culprit. As temperature changes, the air in fuel tank expands and contracts causing fuel vapor to exit the breather hole in the cap.
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