Home > VansAirForceForums

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

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

Old 03-26-2016, 11:07 AM
Piper J3's Avatar
Piper J3 Piper J3 is offline
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,235

Not only the pump and hose, but also the fuel selector valving and inline filter need purging. I'm guessing maybe 1/2 gallon of previous dispense before you start getting the real stuff...
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
Reply With Quote
Old 03-26-2016, 11:31 AM
JPalese's Avatar
JPalese JPalese is offline
Join Date: Apr 2011
Location: KHXF
Posts: 143
Default Ethanol

Originally Posted by N427EF View Post
If I read that post correctly the op used 100LL or ethanol free mogas on that engine.
It is precisely why that kind of corrosion formed because the water in 100LL and ethanol free mogas separates out and settles in low spots in the fuel system. As someone pointed out in that thread, ethanol mogas keeps the water in suspension and it passes harmlessly through the combustion cycle.
Partially Correct.

At some point, if there is enough water in the fuel, the ethanol can not absorb any more water and the ethanol comes out of suspension (the weight of the absorbed water?). If memory serves me correctly when this occurs it makes the fuel look cloudy.

As to the corrosion: If E0 - is corrosion caused by water that can be sumped out of the low points in the fuel system and is so removed;


if E10 (or greater), is the corrosion caused by the constant presence of water that can not be sumped or removed. Water is still water, even if held in suspension, and the water is in constant contact with parts not expecting a visit.
Reply With Quote
Old 03-13-2017, 10:16 AM
funflying funflying is offline
Join Date: Oct 2006
Location: arvada, co
Posts: 466
Default Water and stuff

I had my first experience with water and sediment in some 91 octane ethanol free gas I get in some tanks I take to this station in the Denver area. When I sumped the tank at the gascolator I got this cloudy and reddish sample. Ick! I sumped again and more cloudy gas and it kept coming.

A friend of mine was there who worked at the FBO and he said it looked like water. He let me bring the sample to the FBO and did a hydro test, and it was at the top of the scale for water. I wish I could post the photos off my phone that I sent the fuel distributer.

All the fuel was removed, couple of gallons to flush the lines, and a gascolator clean up. Quite a bit of sand looking debris on the screen. Carb bowls looked okay. I will test with some 100LL from the FBO and go to a different source for my ethanol free gas.
Patrick Claar
Arvada, CO BJC
RV12, #401, Flying 2013, N612PC
RV6, 1996-2010 sold
Reply With Quote

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 03:51 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.