Accidental Mogas Top Off

Accidental Mogas Top Off

Today I accidentally pumped 13 gallons of Mogas when I thought I was getting 100 LL.  I had about 16 gallons of 100 LL already in the tanks.  I have no Mogas STC and wanted the 100 LL.  Can I run the Mogas through and not worry about it or should I get the pales out and drain the tanks immediately?  I can't believe I did that... sad

SkyPilot594
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Re: Accidental Mogas Top Off

Just my thoughts.  I had the STC from Petersen on a 1974 C-150, and as I recall there was no actual change to the airplane.  Just some paperwork.  However, most auto fuel available today has alcohol mixed in it, which is not approved for use even with the STC.  I understand that alcohol is a problem in aircraft fuel systems primarily because it can hide water in the fuel, and is rumored to attack the rubber hoses and seals.

I think if it was my airplane, I would drain the fuel just so I wouldn't have the liability (FAA and Insurance) should something happen.  Of course the other problem is that you can only use the mixed fuel in an engine that doesn't run a catalytic converter for pollution controls, which pretty much limits it to a lawn mower or portable generator (in California anyway).

Jon

jplaxton00
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Re: Accidental Mogas Top Off

i run my 172 I (1968) on nothing but Mogas when i am at my homeairport for the last 4 years with never any issues at all
(Using premium)  if mixed with 100LL i don't think you would ever
notice the differnce at all.
I do have an STC for Mogas however and i find the 172 actually runs
better on Mogas then 100LL and never exp. plug fouling.
maybe time to get STC.

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