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  #1  
Old 02-02-2021, 02:32 PM
N621DF N621DF is offline
 
Join Date: Aug 2017
Location: Escondido, CA
Posts: 3
Question RV12 Fuel Draining

Any recommendations?

I have been due for a Biennial Flight Review during a prolonged Covid19 lockdown and an Annual Condition Inspection, so I haven't flown my plane in several months. I would like to drain the months-old fuel in my RV12 and replace it with fresh fuel. It seems that the safest and most efficient way would be to connect a tube to the bottom of the Gascolator valve and pump the old fuel out with the electric fuel pump. Has anyone done this or have any recommendations?
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  #2  
Old 02-02-2021, 03:12 PM
NinerBikes NinerBikes is offline
 
Join Date: Dec 2018
Location: Granada Hills
Posts: 1,047
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You could also buy a siphon bulb and hose, stick it down the fuel tank, and siphon fuel into a few 5 gallon gas tanks located below the level of the fuel tank on the plane. Let gravity do the work.

Why risk running your battery down to pump the fuel out?

https://www.instacart.com/landing?pr...xoC8pIQAvD_BwE
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Last edited by NinerBikes : 02-03-2021 at 09:57 AM.
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  #3  
Old 02-02-2021, 03:35 PM
Piper J3's Avatar
Piper J3 Piper J3 is offline
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,233
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Quote:
Originally Posted by N621DF View Post
Any recommendations?

I have been due for a Biennial Flight Review during a prolonged Covid19 lockdown and an Annual Condition Inspection, so I haven't flown my plane in several months. I would like to drain the months-old fuel in my RV12 and replace it with fresh fuel. It seems that the safest and most efficient way would be to connect a tube to the bottom of the Gascolator valve and pump the old fuel out with the electric fuel pump. Has anyone done this or have any recommendations?
Yes, I have done this many times.
  • Shut off manual fuel valve
  • Replace drain valve in bottom of gascolator with long pipe nipple
  • Open manual fuel valve
  • Run electric pump
Tank will empty completely...
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Jim Stricker
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 633

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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  #4  
Old 02-02-2021, 04:00 PM
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Dgamble Dgamble is offline
 
Join Date: Aug 2005
Posts: 862
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Quote:
Originally Posted by Piper J3 View Post
Yes, I have done this many times.
  • Shut off manual fuel valve
  • Replace drain valve in bottom of gascolator with long pipe nipple
  • Open manual fuel valve
  • Run electric pump
Tank will empty completely...
Would there be any point in draining the carb bowls to get rid of the fuel that's already past the gascolator?
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Grove City, OH

RV-6 N466PG Purchased already flying - SOLD!

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The above web blogs and any links provided thereto are not instructional or advisory in nature. They merely seek to share my experiences in building and flying Van's RV airplanes.
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  #5  
Old 02-02-2021, 04:16 PM
funflying funflying is offline
 
Join Date: Oct 2006
Location: arvada, co
Posts: 466
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I just emptied mine yesterday during condition inspection and did it pretty much like Jim listed above. However I removed the fuel line from the top of the gascolator and attached a two foot hose into a fuel can. Using the electric pump to get the gas out but be aware as you near the end the tank baffles slow the flow. I shut things down for a few minutes and allow the gas to drain forward. Then start again until the pump starts to clatter, stop and let the fuel move forward, then again till clattering again.
The last part takes three to four times to get all the gas out.

I would remove the float bowls to get that gas out too.
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Arvada, CO BJC
RV12, #401, Flying 2013, N612PC
RV6, 1996-2010 sold
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  #6  
Old 02-02-2021, 04:25 PM
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Piper J3 Piper J3 is offline
 
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I wouldn't drain float bowls unless fuel was really old. When engine starts the fuel in the bowls will get consumed quickly at low engine power. Even if octane is way low it won't hurt anything for short time period.

My fuel sits in the tank from Nov - April because grass strip is unusable until ground dries up in the spring. I have original vented fuel cap and not the new style filler tube vent. With small hole in the vented cap there is very little air exchange in the tank. Tank remains half full in the winter and I add fresh 93E10 to top of tank before flying season starts.


This is why I'm not flying now...
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__________________
-
Jim Stricker
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 633

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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  #7  
Old 02-02-2021, 04:46 PM
mcems mcems is offline
 
Join Date: Apr 2008
Location: Salem SD
Posts: 169
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My grass strip could look the the same during the winter months ,but I keep my grass runway clear with my 3020 John deere and 7ft snow blower . I fly year round . I have 15.5 hours in December and 9 hours in January . I fly year round. Winter flying is actually better.

Not bad for South Dakota.

Brad Stiefvater
Salem SD
124 BJ
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  #8  
Old 02-02-2021, 05:24 PM
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rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,203
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The RV-12ULS Maintenance Manual (starting on page 13-4) documents (step by step) the recommended procedure for draining the fuel tank.
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Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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  #9  
Old 02-03-2021, 12:22 AM
RFSchaller RFSchaller is offline
 
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Location: Phoenix, AZ
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If your engine runs with normal indications why not just use the fuel as opposed to assuming it is bad? If you donít have a full tank just add fresh AVGAS if it gives you more confidence.
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  #10  
Old 02-03-2021, 07:56 AM
bobg56 bobg56 is offline
 
Join Date: Nov 2018
Location: Peachtree City, GA
Posts: 146
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Ever since I've had my RV12 about 2.5 years now I've added 1 oz. of "Sea Foam" to each gallon of gas, it claims to stabilize gas for 2 years. This product has been around since the 40's...it helps to reduce carbon build up, keeps carb jets clean and is an upper cylinder lubricant. I've been using it for about 170 hours, engine runs smooth and it quick to start. I've heard of others using "Stabill" but since I use Seafoam in my boat so I've chosen to use it in my RV12 as well.
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