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  #1  
Old 01-17-2021, 01:35 PM
MED MED is offline
 
Join Date: Jul 2015
Location: Aiken, SC
Posts: 686
Default Gas Smell

When I switched tanks during my last flight, I turned on the fuel pump, as I always do, but forgot to turn it back off for a few minutes. I discovered it when I smelled gas, which was a first for me. I just removed the tunnel covers on both sides of the aux. pump and inspected the fuel lines all the way to the firewall with no evidence of fuel - enough dust to be sure. Any hints what might have caused the smell?
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  #2  
Old 01-17-2021, 03:16 PM
Jake14 Jake14 is offline
 
Join Date: May 2014
Location: Seattle
Posts: 343
Default

In my case, the fuel smell is usually associated with fuel coming from the vents during acro or after sloshing around with a nearly full tank.. It's fairly short duration, about a minute. Any longer might be cause for concern
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  #3  
Old 01-17-2021, 06:23 PM
mturnerb mturnerb is offline
 
Join Date: Apr 2015
Location: Ponte Vedra, FL
Posts: 1,532
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Given the story of when this happened, probably not an issue but it's a good idea to look underneath for any fuel stains, especially at wing roots. Could be a leak where fuel lines enter fuselage, or the two connections between tank and fuselage.
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  #4  
Old 01-17-2021, 07:13 PM
MED MED is offline
 
Join Date: Jul 2015
Location: Aiken, SC
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Quote:
Originally Posted by mturnerb View Post
Given the story of when this happened, probably not an issue but it's a good idea to look underneath for any fuel stains, especially at wing roots. Could be a leak where fuel lines enter fuselage, or the two connections between tank and fuselage.
I crawled all over under the plane and didnít see any staining. I figured it must be related to the aux. pump, since I only smelled it when I forgot the pump on and only while it was on. Iím going to check the fuel lines on the engine side of the firewall, but didnít think I would smell anything from there at 170 kts.
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  #5  
Old 01-18-2021, 08:51 PM
mturnerb mturnerb is offline
 
Join Date: Apr 2015
Location: Ponte Vedra, FL
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Quote:
Originally Posted by MED View Post
I crawled all over under the plane and didnít see any staining. I figured it must be related to the aux. pump, since I only smelled it when I forgot the pump on and only while it was on. Iím going to check the fuel lines on the engine side of the firewall, but didnít think I would smell anything from there at 170 kts.
Fuel goes overboard via the sniffle valve when that happens (ask me how I know) - explains the smell.
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  #6  
Old 01-19-2021, 02:25 PM
MED MED is offline
 
Join Date: Jul 2015
Location: Aiken, SC
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Quote:
Originally Posted by mturnerb View Post
Fuel goes overboard via the sniffle valve when that happens (ask me how I know) - explains the smell.
Interesting. I flew today and, as normal, did not smell anything unusual. I did not know excess fuel (?) would dump out the sniffle valve with the engine running. How did you learn this . . . inquiring minds want to know . . .
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