VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

  #1  
Old 07-03-2022, 09:02 PM
pv9 pv9 is offline
 
Join Date: Feb 2022
Location: San Jose
Posts: 27
Default RV-8A fuel smell after landing

Hi folks:
I just “adopted” my recently purchased and RV-8A and did my transition training. It is a wonderful aircraft to fly. Lots of minor squawks but a possibly worriesome one that I wanted to consult the experts on this forum on.
I have a carbureted O-360.
After landing with the fuel boost pump on and mixture rich I get a smell of fuel that goes away. This happens every time on landing:
__________________
Donated Feb 2022.
Reply With Quote
  #2  
Old 07-04-2022, 08:34 AM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 3,829
Default

Look for the telltale blue stains on the fuel runs aft of the firewall, including wing root. Don’t forget to look at the vent lines as well.

Here a small air leak will show up as a fuel smell after running the boost pump for landing. The RV-8/8A fuel line plumbing is challenging - and a source of hours of “loosing your religion” work.

Carl
Reply With Quote
  #3  
Old 07-04-2022, 09:27 AM
pv9 pv9 is offline
 
Join Date: Feb 2022
Location: San Jose
Posts: 27
Default

Quote:
Originally Posted by Carl Froehlich View Post
Look for the telltale blue stains on the fuel runs aft of the firewall, including wing root. Don’t forget to look at the vent lines as well.

Here a small air leak will show up as a fuel smell after running the boost pump for landing. The RV-8/8A fuel line plumbing is challenging - and a source of hours of “loosing your religion” work.

Carl
Thank you so much. I will troubleshoot based on this valuable tip!
__________________
Donated Feb 2022.
Reply With Quote
  #4  
Old 07-04-2022, 10:15 AM
Mikeyb Mikeyb is online now
 
Join Date: Nov 2018
Location: Pasadena ca
Posts: 175
Default

I had a tank leak develop at the famous aft baffle seam. It was small enough I couldn’t see any evidence of it externally but found it with a borescope. I could smell it in the cockpit after landing for some reason.

Good hunting
__________________
Mike
N36MB
SN 83764
IO360-M1B
Hartzell Composite CS
Flying Phase 1
KAJO
Reply With Quote
  #5  
Old 07-04-2022, 10:34 AM
Ironflight's Avatar
Ironflight Ironflight is offline
VAF Moderator / Line Boy
 
Join Date: Jan 2005
Location: Dayton, NV
Posts: 13,156
Default

Probably not your case, but the -8 is well known to give a fuel smell with full tanks in the pattern because it burps a little fuel out the tank vents, and this migrates into the under-wing passenger vent. It seems more common with a full right tank than left (probably because that is the side the vent is on).

If you’re sure it only occurs with the pump on, then you might well have a leak somewhere - but since you’re new to the -8, figured you should know of this “characteristic”. I think other models will burp fuel out the vents as well, but they don’t have an under-wing vent to pipe the fuel into the cockpit.
__________________
Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
Reply With Quote
  #6  
Old 07-04-2022, 11:00 AM
Check6's Avatar
Check6 Check6 is offline
 
Join Date: Apr 2009
Location: Georgetown, Texas
Posts: 180
Default Value of VAF

Ironflight,
This is one of the many reasons this VAF forum is so valuable! Pearls like this. Funny thing was when I saw the post I thought what the heck, then read it and went oh yeah, just took that "uniqueness" for granted everyone else knows this. Nice to keep sharing the nuisances of each airplane type.
Thanks!
__________________
Bobby "Luke" Lucroy
Georgetown, Texas (KGTU) RV-8A
Falcon Flight Formation Team
Reply With Quote
  #7  
Old 07-04-2022, 02:04 PM
pv9 pv9 is offline
 
Join Date: Feb 2022
Location: San Jose
Posts: 27
Default

Quote:
Originally Posted by Ironflight View Post
Probably not your case, but the -8 is well known to give a fuel smell with full tanks in the pattern because it burps a little fuel out the tank vents, and this migrates into the under-wing passenger vent. It seems more common with a full right tank than left (probably because that is the side the vent is on).

If you’re sure it only occurs with the pump on, then you might well have a leak somewhere - but since you’re new to the -8, figured you should know of this “characteristic”. I think other models will burp fuel out the vents as well, but they don’t have an under-wing vent to pipe the fuel into the cockpit.
I found these blue telltale signs by the fuel flow transducer cube.
The area around it was dry but there was an oily residue near the corners. It appears that there is a very small amount of vapor coming from there. Aircraft is grounded until this can be traced and fixed!
Attached Thumbnails
Click image for larger version

Name:	D7D6F96A-2CA4-4008-B8AB-7BF77B8C05E8.jpg
Views:	307
Size:	249.8 KB
ID:	27761  
__________________
Donated Feb 2022.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 08:01 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.