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  #1  
Old 01-14-2021, 05:24 PM
BH1166 BH1166 is offline
 
Join Date: Nov 2017
Location: Eatonton Georgia
Posts: 349
Default Mogas

Anyone have any issues they can directly correlate Mogas use concerning the tank/paint issues? Two builder/ friends have some quarter size paint blisters over a few random rivets. One runs 100ll in one tank , mogas in other...only Mogas tanks has a few blisters. Blisters are not fluid filled . One plane, RV 4 ,10+ years old, other 6 year old RV 3.

Thanks
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  #2  
Old 01-14-2021, 08:24 PM
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Larry DeCamp Larry DeCamp is offline
 
Join Date: Apr 2010
Location: Clinton, Indiana
Posts: 1,051
Default BH response

MR STEWART, at Kosh told me years ago that auto fuel has injector cleaners in the recipe that 100LL does not. That is why my paint peeled off when the primer was accessible due to lack of protection ( read rivets, edge of surfaces ) from the 2k finish system whether urethane or acrylic.

So, the question to investigate is how robust is the primer ? Is there a difference between epoxy vs self etching vs other ?
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Larry DeCamp
RV-3B flying w/7:1 0320 / carb / Pmags / Catto 3b / digital steam
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Clinton, IN
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  #3  
Old 01-14-2021, 08:56 PM
alcladrv alcladrv is offline
 
Join Date: Oct 2006
Location: Southeast
Posts: 606
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I run 91UL in my -7A on occasion. When I had a leaky fuel drain, the occasional drip of fuel would land on the gear leg fairing painted with Acry-Glo. Over a period of a few months the mogas discolored the paint. Then one time, the drain didn't seal because of some crud in the tank and within a week, the paint looked so bad on the gear leg fairing that it had to be re-painted
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  #4  
Old 01-15-2021, 02:03 AM
swisseagle's Avatar
swisseagle swisseagle is offline
 
Join Date: Feb 2005
Location: 20km outside of Zurich, Switzerland
Posts: 495
Default Quick built or standard built?

Quote:
Originally Posted by BH1166 View Post
Anyone have any issues they can directly correlate Mogas use concerning the tank/paint issues? Two builder/ friends have some quarter size paint blisters over a few random rivets. One runs 100ll in one tank , mogas in other...only Mogas tanks has a few blisters. Blisters are not fluid filled . One plane, RV 4 ,10+ years old, other 6 year old RV 3.

Thanks
Normally you get blister on QB kits, because in the past they where not following the industrial standards, covering each seam at least 1/2" into the material.
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RV-7A, TMX-IO-320, FM-150, Sensenich FP
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  #5  
Old 01-15-2021, 07:41 AM
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RV8Squaz RV8Squaz is offline
 
Join Date: Feb 2006
Location: Senoia, Georgia
Posts: 839
Default

Blisters have occurred on tanks with MOGAS or 100LL, QB or standard build, freshly painted or flown for 5 years without, gs or no gs, grass or no grass, nose wheel or tail dragger, primer or no primer, and glass panel or steam gauge panel. No one has solved the mystery!
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RV-8 N84JE
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  #6  
Old 01-15-2021, 08:00 AM
sailvi767 sailvi767 is online now
 
Join Date: Sep 2010
Location: Charlotte NC
Posts: 1,267
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When shopping years ago for a RV6/7 I did look at one aircraft that had at least a dozen blisters on the tank using auto fuel and none on the 100LL side. He ran the highest quality auto fuel available. This thread makes me wonder if the higher quality auto fuel which normally has more additives could be at fault.
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  #7  
Old 01-15-2021, 09:26 AM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
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Quote:
Originally Posted by sailvi767 View Post
When shopping years ago for a RV6/7 I did look at one aircraft that had at least a dozen blisters on the tank using auto fuel and none on the 100LL side. He ran the highest quality auto fuel available. This thread makes me wonder if the higher quality auto fuel which normally has more additives could be at fault.
It is quite debatable that auto fuel is better. However, the additive packages are very different and it's not surprising that there are additives in the auto fuel that can either break down the proseal or simply allow migration past compromised sealing that the 100LL additives cannot.
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  #8  
Old 01-15-2021, 11:03 AM
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DeeCee 57 DeeCee 57 is offline
 
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Location: LSZF
Posts: 550
Default

my 2005 ride has been running AVGAS on one, and MOGAS on the other tank, for the whole time. Neither leaks nor blisters
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  #9  
Old 01-15-2021, 11:05 AM
abwaldal@gmail.com abwaldal@gmail.com is offline
 
Join Date: Jan 2017
Location: Battle Ground WA
Posts: 143
Default blisters

I have been running Costco premium for the last 3 years in my 19 year old tanks, and had zero problems in my RV-6A. I have a 110 gallon tank/transfer situation in my truck so works great. But no blisters anywhere.
Art
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