lgold(at)quantum-associat
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 Posted: Sat Nov 01, 2008 11:01 am Post subject: Fuel return-Mogas |
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Phil,
Like you, I always use mogas when I can find it but I check for ethanol each time. In my area (N. Ca.), until last week there was no ethanol in the Chevron 91 octane. Now Chevron apparently switched to a winter formula and is running a little over 5% ethanol. Rotax says for my 912ULS, not to use fuel with more than 5% ethanol. Now I'm not sure if I should continue using mogas this winter. A friend has switched to 50% LL100- 50% mogas since the mix would reduce the ethanol percentage. This seems like a real pain. I may just switch to LL100 and add an additive to reduce the possibility of lead fowling (I use ALCOR TCP CONCENTRATE when I fill up with LL100... it really works).
Les
[quote] From: owner-zenith701801-list-server(at)matronics.com [mailto:owner-zenith701801-list-server(at)matronics.com] On Behalf Of philip smith
Sent: Sunday, September 07, 2008 4:44 PM
To: zenith701801-list(at)matronics.com
Subject: Fuel return
I posted this a while back but did not get definitive answers. The Rotax 912ULS I'm hanging on my CH-701 has a fitting on the top of the fuel rail that says "return line to tank" in the Rotax installation manual. Some have said just to block it off - others said they plumbed it back to a "line from the tank". I imagine that this line is to prevent fuel vaporization. I have installed a Spruce gascolator ahead of the firewall it has a 1/8 npt fitting in the top for "fuel primer". Would it work to run a 1/4 hose to this fitting - I don't want to run another line back through the cockpit if I don't have to. Planning to use 91 octane mogas - field elevation is 4000ft with hot summers.
Thanks Phil
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