Hey guys,
because the P-40 has no gauges for the reserve and the aux tank we're prone to run out fuel temporary. I know it's a question of timing and managing the fuel tank system to avoid that. Anyway: Does it harm the engine if you run out of fuel and the propeller drives the engine until you switch to an other fuel tank. I think it's like pulling back the throttle out of high power to low idle extreme rapidly while flying fast and that can't be good for the system.
Thanks in advance,
Zacke
suddenly running out of fuel: harmful for the engine?
Re: suddenly running out of fuel: harmful for the engine?
I wouldn’t think so, Zacke. Its such a momentary occurrence, normally. The oil pump is engine driven, the propeller is still turning the engine over so oil pressure should still be present. Its a good question, though, so maybe a resident expert will weigh in.
Meanwhile, an interesting and accessible explanation of the “prop driving the engine”:
https://www.avweb.com/features/pelicans ... g-engines/
Meanwhile, an interesting and accessible explanation of the “prop driving the engine”:
https://www.avweb.com/features/pelicans ... g-engines/
- DHenriques_
- A2A Chief Pilot
- Posts: 5711
- Joined: 27 Mar 2009, 08:31
- Location: East Coast United States
Re: suddenly running out of fuel: harmful for the engine?
The answer really lies in engine "management" and how you treat your engine generally. Basically it boils down to this. ANY sudden change in temperature and/or pressure inside an engine, especially an aircraft engine where the internals are closely matched, CAN be harmful.Zacke wrote: ↑04 Jan 2021, 04:11 Hey guys,
because the P-40 has no gauges for the reserve and the aux tank we're prone to run out fuel temporary. I know it's a question of timing and managing the fuel tank system to avoid that. Anyway: Does it harm the engine if you run out of fuel and the propeller drives the engine until you switch to an other fuel tank. I think it's like pulling back the throttle out of high power to low idle extreme rapidly while flying fast and that can't be good for the system.
Thanks in advance,
Zacke
There are always proponents who cross the T's and dot the I's but the general rule is that it's never a good idea to allow sudden changes in how the engine is operating such as a high RPM accidental OFF selection with the mag switch; sudden power changes; or sudden temperature change.
The bottom line is that anytime you can avoid these factors you are doing your engine a huge favor. Allowing these things might not immediately cause a major issue for the engine but over time, every flight you make and every time you run your engine, the engine "remembers" how it was treated.
So on your fuel tank question, if you have a choice, try and manage your fuel schedule so that you don't allow the engine to quit before switching tanks. Factor in some room in your fuel calculation designed to prevent an engine cutoff. If you aren't doing that you might be pushing your fuel vs flight time a bit too much.
In all the years I flew I never allowed a tank to drain completely dry. I always gave myself a little "room" with fuel.
Dudley Henriques
Re: suddenly running out of fuel: harmful for the engine?
Thanks a lot for your input, guys!
Who is online
Users browsing this forum: No registered users and 18 guests