The plane in question is a Lake LA-4 amphibian. The engine mounted on a pylon some three or 4 feet above the fuel tank. N1120L
The fuel pump is engine driven. 4 ft lift. 100ll and it's ability to stay liquid and not devolve in to vapor in a vacuum in an application such as this at 13k ft. No car gas. I think I noted no header tank, don't recall saying single pump. However if you follow the instructions you will be running a single pump. There is an electric additional pump (backup?) for use only during approaches and takeoffs. Might be useful in an emergency. So if you follow the instructions, in cruise your first sign of trouble is a flameout. Unless your instrument scan habits are so fast you caught the 3 second interval between pressure collapse and flameout. I cannot devote that kind of time to checking a fuel pressure gauge while maintaining my other pilot duties in flight. Gonna hope that while after flameout and while dropping like a lead balloon (amphibs are after all flying bricks) that backup pump does something other than hopelessly flooding the engine, and oh, btw how's that starter doing right now?. Engine is hot, primer, no primer, wait for the carb to refill? This plane has no primer! oops too much with the accellerator pump and now it is flooded...... damn the sticky starter bendix! Try it again and again whilst setting up for a landing between those cars on I-5. Well the battery will be exhausted by the end so might not work to ignite the post impact fire. Dang! Was I supposed to do something with prop pitch during a flame out? No instructor said anything about that! Hey now's my chance to find out! maybe I can "compression start" this thing.. where's the clutch? ugh. Better no flameout at all me thinks. Much preferable to have a half hour flameout heads up by a header tank that refuses to top off. Better scenario: Ho Hum, (yawn).. dang it won't top off. I guess I hafta land soon.. Boring.... copilot is still asleep.. That's ok... I hope I can stay awake that long. (yawn)** hmm nearby fields with fuel.?.... Seems like a better set of problems to me. jg On Fri, Nov 19, 2021, 16:15 Flesner <fles...@frontier.com> wrote: > On 11/18/2021 8:16 PM, John Gotschall wrote: > > BTW my current factory built airplane has no header, will quit upon pump > > fail and without warning. Somehow that's ok with the FAA. > > John, > > I'm curious as to what factory built airplane you have that has no > gravity feed and a "single" fuel pump system with no backup. Many > "factory" built airplanes with no gravity feed use an engine driven pump > with an electric pump backup. > > <https://list.krnet.org/empathy/list/krnet.list.krnet.org/-Search> ________________________________ -Please see LIST RULES and KRnet info at http://www.krnet.org/info.html -Change list delivery options at https://list.krnet.org/list/krnet.list.krnet.org/ Affinity List Info Board -Search recent KRnet Archives at https://list.krnet.org/empathy/list/krnet.list.krnet.org/ -Search John Bouyea's decades of archive at https://www.mail-archive.com/krnet@list.krnet.org/
