I really hope this thread doesn't devolve into yet another debate about the disastrous consequences of running ethanol mogas in a Lycoming. I know, I know, my plane will fall out of the sky. Been there, heard that.
In my endeavour to run mogas in my RV9, and realizing that ethanol-free mogas is getting harder and harder to find, I've decided that my fuel system needs to be ethanol compatible. I hope to be able to find ethanol compatible materials for every part of my fuel system as I build (note: no engine-driven fuel pump). So far the only parts of the fuel system I have are the tank drains and fuel caps.
Rather than attempting to contact the manufacturers and getting sometimes questionable data from them, I decided to just assume every seal and o-ring is NOT ethanol tolerant and set about carefully measuring for Viton replacements.
First, the fuel drains. These o-rings come in packs of 100. More than I'll ever need.
The Deluxe Locking Caps from Vans each have three o-rings:
The whole thing is rather simple to take apart and put back together, however I made sure to only disassemble one at a time in case I needed a reference for reassembly. I suppose I should probably use a little fuel lube on the new o-rings - any suggestions?
I have quite a few extras of each size, except the big cap o-rings, and I'm willing to share.
Hope this helps someone. Enjoy!
In my endeavour to run mogas in my RV9, and realizing that ethanol-free mogas is getting harder and harder to find, I've decided that my fuel system needs to be ethanol compatible. I hope to be able to find ethanol compatible materials for every part of my fuel system as I build (note: no engine-driven fuel pump). So far the only parts of the fuel system I have are the tank drains and fuel caps.
Rather than attempting to contact the manufacturers and getting sometimes questionable data from them, I decided to just assume every seal and o-ring is NOT ethanol tolerant and set about carefully measuring for Viton replacements.
First, the fuel drains. These o-rings come in packs of 100. More than I'll ever need.
![23utyyo.jpg](/community/proxy.php?image=http%3A%2F%2Foi51.tinypic.com%2F23utyyo.jpg&hash=aa269bc4fe07d189585130d2a7c8c2db)
![fp74t5.jpg](/community/proxy.php?image=http%3A%2F%2Foi52.tinypic.com%2Ffp74t5.jpg&hash=7b2617695a6eacddb31231d41bbeca03)
The Deluxe Locking Caps from Vans each have three o-rings:
![2rzoopt.jpg](/community/proxy.php?image=http%3A%2F%2Fi55.tinypic.com%2F2rzoopt.jpg&hash=9d01c242de232e5e3c3d47f9a197ec2b)
![bgb5k.jpg](/community/proxy.php?image=http%3A%2F%2Fi51.tinypic.com%2Fbgb5k.jpg&hash=d42425c49be5b94fc4fe07b8c16e2602)
![30bengo.jpg](/community/proxy.php?image=http%3A%2F%2Fi55.tinypic.com%2F30bengo.jpg&hash=7d2120f313a8f7c211cb182410b82651)
The whole thing is rather simple to take apart and put back together, however I made sure to only disassemble one at a time in case I needed a reference for reassembly. I suppose I should probably use a little fuel lube on the new o-rings - any suggestions?
I have quite a few extras of each size, except the big cap o-rings, and I'm willing to share.
Hope this helps someone. Enjoy!