Any fuel will transition to vapor along the temperture/pressure line for that fuel. Keep it cooler or under more pressure and it will not change phase to vapor from liquid.
If it is cool enough in the tank and under sufficient pressure it is then safe to stay liquid in the tank. Raising the pressure before it leaves the tank (via an in tank or near tank pump) ensures it does not change phase to gas as it travels along a fuel line at the same temperature but higher pressure. This is why putting a fuel pump at the destination is simple to implement but encourages vapor lock as that practice causes lower, not higher fuel line pressures. Cool and pressurized means no vapor lock. Detonation is a whole other topic. cheers! jg On Mon, Dec 22, 2025, 19:27 Kayak via KRnet <[email protected]> wrote: > I guess the problem solver in me asks "what would it take to make the KR > impervious to any gas station fuel?" after all, our cars engines, some of > which are very complex, can run on gas from any gas station. > > aluminum fuel tank would seem to solve it that far. fuel lines should be > easy to solve as well. theres whatever carb (or efi) u running. > > and also the running characteristics themselves. would the crappy > (relative to extinction-risky avgas) fuel vapor lock or do something else > bad when running it? > > these are all legitimate questions which could lead to an affordable and > available fuel for our planes, if the risks are mitigated. > > On Mon, Dec 22, 2025 at 4:14 PM Larry Flesner via KRnet < > [email protected]> wrote: > >> >> On 12/22/2025 2:23 PM, Kayak via KRnet wrote: >> >> this is interesting and scary. my own goal would be to be able to run >> auto fuel reliably. IF possible. but at this point since I have no kit nor >> plans to build, just an academic question. "back in the day" I had a >> Grumman AA1 with auto fuel STC and it worked fine, AvGas was $1.93 and car >> gas was $1.35. but that was before this stupid ethanol travesty >> started. :) >> >> >> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ >> >> And summer and winter blends and California only blends and, as Jeff >> Scott found out the hard way, all the different unknown additives that >> different suppliers put in their mix. There are probably a number of auto >> fuel suppliers that sell a compatible product but "consistent >> dependability" is hard to come by in today's market. Is doing a time test >> on every 5 gallon jug of fuel worth the dollar savings? Does every airport >> selling "auto fuel" do a "time test" on every batch of auto fuel or simply >> the standard daily test for water / impurities? And, even airports that >> sell a good mix of "auto fuel" probably sell limited quantities in >> relation to their tank volume. How long has that last delivery set in >> their tanks and has the quality held over time? >> >> As always, YRMV..................... >> >> Larry Flesner >> -- >> KRnet mailing list >> [email protected] >> https://list.krnet.org/mailman/listinfo/krnet >> > -- > KRnet mailing list > [email protected] > https://list.krnet.org/mailman/listinfo/krnet >
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