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  #1  
Old 11-11-2017, 02:23 PM
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JackinMichigan JackinMichigan is offline
 
Join Date: Nov 2012
Location: Canton, MI
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Default Fuel smell on takeoff

We took our RV-10 on it's second flight today. Both flights were 45 minute long circles around the airfield at 2,400 AGL.

On takeoff, between right when the wheels leave the ground to about 700 ft, I'm getting a distinct and unmistakable odor of fuel in the cockpit. It goes away once I reach 1000 ft, but it's happened both times. Takeoff is, of course, full rich, full throttle and prop governor all the way in. Apart from that both flights have been quite uneventful.

I really want to know where this fuel smell is coming from. We pressure tested the fuel system to 20psi (the most pressure the fuel valve can handle) and it stayed rock solid for days. Anyone else experience this?
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RV-10 N1861G
Build #41389, started Oct 2012
Current status: 1st Flight 11/10/17
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  #2  
Old 11-11-2017, 02:51 PM
rvdave rvdave is offline
 
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We’re the tanks full? Fuel vent at wing root? Odor thru aileron push tube hole?
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Cadillac, Mi
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  #3  
Old 11-11-2017, 03:08 PM
David Paule David Paule is offline
 
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Did you check the fuel vent system?

Dave
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Old 11-11-2017, 03:14 PM
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JackinMichigan JackinMichigan is offline
 
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First flight tanks were about 1/2 full. Second flight tanks were completely full. Same smell both times.
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RV-10 N1861G
Build #41389, started Oct 2012
Current status: 1st Flight 11/10/17
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Old 11-11-2017, 04:11 PM
Jasonm Jasonm is offline
 
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I had the same thing happen to me after refueling. Really got my attention! It dissipated shortly after I reached pattern altitude. I attribute the odor to the tanks being full.
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  #6  
Old 11-11-2017, 04:14 PM
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Bill.Peyton Bill.Peyton is offline
 
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Either fuel level sending unit or B nut is loose on fuel vent line inside the tank. Open the lower intersection compartment and take a look for stains. If no fuel stains around sending unit, then fill tank and watch fo fuel to flow out of the vent. http://www.vansairforce.com/communit...ight=Fuel+vent


You should not smell fuel even when you over fill the tank..... Here is a good thread to read on a similar issue

http://www.vansairforce.com/communit...ght=Fuel+smell
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Last edited by Bill.Peyton : 11-11-2017 at 04:42 PM.
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Old 11-11-2017, 04:56 PM
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snopercod snopercod is offline
 
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One thing I discovered during my Phase I testing was that every single B-nut on the entire aircraft needed re-torquing. Vibration, I guess...
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Old 11-11-2017, 05:49 PM
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9GT 9GT is offline
 
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Wrap all your fuel fittings with white tissue or napkin and tape. Take it around the pattern and check them all for the telltale blue stains. It is known that the vents sometimes will purge a bit of fuel and you can smell it in the cockpit. Knowing this I took great care to seal out any air entering from the wing roots by fabricating flexible control rod boots and sealing up any wire/fuel line holes with a little silicone. Never had a fuel smell problem and I always kept the tissue wrapped on the fittings and inspected at every condition inspection.
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  #9  
Old 11-15-2017, 10:22 AM
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JackinMichigan JackinMichigan is offline
 
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Quote:
Originally Posted by Bill.Peyton View Post
Either fuel level sending unit or B nut is loose on fuel vent line inside the tank. Open the lower intersection compartment and take a look for stains. If no fuel stains around sending unit, then fill tank and watch fo fuel to flow out of the vent. http://www.vansairforce.com/communit...ight=Fuel+vent


You should not smell fuel even when you over fill the tank..... Here is a good thread to read on a similar issue

http://www.vansairforce.com/communit...ght=Fuel+smell
I think that turned out to be it. The left tank was dripping fuel out of the overflow and leaking in several places, in spite of the fact it was a quick build and these tanks were guaranteed not to leak. In the process of pulling the tank off and sending it back to Vans.
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Jack and Dave Groat, father and son
RV-10 N1861G
Build #41389, started Oct 2012
Current status: 1st Flight 11/10/17
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  #10  
Old 11-15-2017, 11:07 AM
Jimd Jimd is offline
 
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If you don't keep the ball in the center during climbout and the tanks are anywhere near full and you DONT smell fuel you aren't using all your available senses.
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