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04-12-2020, 10:34 PM
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Join Date: May 2014
Location: Seattle
Posts: 342
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fuel odor after looping
I do just basic positive-g acro in my 14, but notice that after a couple of loops (+4 to 0 g) I get a faint smell of fuel in the cockpit which disappears in a minute or so. Don't get this with other maneuvers. I've checked all the fuel system connections but can't find any evidence of leaks (odor or blue stains)
Wondering if this is common or cause for concern and any suggestions where to look would be appreciated
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RV-14A flying 450 hrs
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04-12-2020, 11:04 PM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,999
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I don't loop but you're doing the right thing to find the source of the fuel smell. Anytime you smell fuel, find the source.
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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all
Simplicity is the art in design.
I was born an airplane nut. I have no explanation for it.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
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04-12-2020, 11:12 PM
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Join Date: May 2013
Location: Sherman, CT
Posts: 862
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Most likely fuel exiting the vents.
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Jake
RV6 #20477 completed 1991 sold.
RV7 #72018 N767T first flight 11/21/2017 350+ hrs.
IO-360M1B MT 3 blade, Dual AFS 5600 QUICK Panel.
Manual Flaps. (KOXC)Oxford, CT, (0NY0)North Creek, NY.
1941 J3 Cub skis,floats.
2020 dues gladly paid.
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04-13-2020, 12:19 AM
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Join Date: Sep 2015
Location: Socal
Posts: 470
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I have the same problem sometimes on my 8 usually as I approach 0 G's. I think it's from the fuel vents. I checked all my fuel lines and made sure there was no leaks. Mine also only happens during acro.
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RV-8 N695RA flying
Working on an RV-4
Born to fly, forced to work
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04-13-2020, 08:35 AM
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Join Date: Apr 2012
Location: Kingsville, Ontario, Canada
Posts: 296
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I get this occasionally to but only on the first climb out on real full tanks. After that nothing. Figured it came from one of the vents as there are no other system leaks.
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Dennis Enns
Kingsville, ON
Bellanca Champ 7ACA since 1986, restored 1990.
RV-8 IO375, Hartzell CS, dual PMags.
2020 Donation In 
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04-13-2020, 11:15 AM
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Join Date: Jan 2005
Location: Ontario, Canada
Posts: 1,555
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With full tanks, in the sun, I have found that there is a very small leakage of fuel around the stem of the Van?s standard fuel valve. Check with a small bit of Kleenex at the top of the valve
This is a very tiny amount of fuel, the odour, is distinctive.
Typically it happens about two or three minutes into the flight with full tanks. Changing tanks will eliminate the issue
I have also experienced, occasionally, the fuel smell, from fuel vents, during aerobatics.
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Tom Martin RV1 pilot 4.6hours!
CPL & IFR rated
EVO F1 Rocket 1000 hours,
2010 SARL Rocket 100 race, average speed of 238.6 knots/274.6mph
RV4, RV7, RV10, two HRIIs and five F1 Rockets
RV14 Tail dragger
Fairlea Field
St.Thomas, Ontario Canada, CYQS
fairleafield@gmail.com
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04-13-2020, 12:22 PM
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Join Date: Apr 2012
Location: Kingsville, Ontario, Canada
Posts: 296
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Tom, yes probably the fuel caps. When I fill to the brim and then bring my RV into the heated hanger I can get a pretty good fuel stain in a few days off the left cap - gas expands. I don?t do this anymore.
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Dennis Enns
Kingsville, ON
Bellanca Champ 7ACA since 1986, restored 1990.
RV-8 IO375, Hartzell CS, dual PMags.
2020 Donation In
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04-13-2020, 03:32 PM
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Join Date: May 2014
Location: Seattle
Posts: 342
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Thanks for the suggestions, I fly with fairly full tanks so I think the vent may be what's causing it. On a pull-up to vertical with plenty of fuel in the tanks, the vent intake at the top/rear/outboard of the tank probably gets submerged. Then the positive g at the bottom pushes the fuel out.
Thanks again.
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RV-14A flying 450 hrs
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04-13-2020, 03:46 PM
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Join Date: Feb 2005
Location: Victoria B.C.
Posts: 1,275
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It's a lot more fun to do acro on 1/4 to 1/3 full tanks.
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04-13-2020, 03:52 PM
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Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,434
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Quote:
Originally Posted by Jake14
Thanks for the suggestions, I fly with fairly full tanks so I think the vent may be what's causing it. On a pull-up to vertical with plenty of fuel in the tanks, the vent intake at the top/rear/outboard of the tank probably gets submerged. Then the positive g at the bottom pushes the fuel out.
Thanks again.
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On your next fill up, try to see if you can lift of the nose wheel and observe. With the 14 tanks, you will get two cups or more of fuel coming out of the vent. The fuel goes to the back and outer corner of the tank where the vent line is terminated at. I noticed this during my phase one and testing.
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Mehrdad
N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - Flying
Dues paid
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