There are several solutions to prevent a fuel system from sucking air from a fuel tank while in a steep turn when the fuel level is low.   This has been a hot debate on other forums.

I am curious to hear from folks who are actually flying their planes on which design you use to address this risk.  

1) Header tanks?

2) Check valves?

3) Limit fuel selector valve to only use R or L tank but not both?

4) None, I use "both" on my selector valve and do not have a header tank and have not had any issues. 

Could you you please comment which model you are flying and what engine, and if it is F.I. or carburated and if you have fuel return lines. 

Thank you !!!!!

Charlie 

Views: 436

Reply to This

Replies to This Discussion

You start the post by stating "There are several solutions to prevent a fuel system from sucking air from a fuel tank while in a steep turn when the fuel level is low".  Unporting a fuel tank and sucking air is not necessarily the same.  The fuel pumps in our header tank will not suck air until the header tank is dry, and that can only happen after all fuel in both wing tanks is consumed.  

Loren,

Some people use the term "unporting" to describe a dire situation where the fuel port (the exit out of the tank) is no longer covered  by fuel and as a result it is not delivering fuel, and as a result sucking air.   In the case where there is a header tank that has fuel, and the main tank(s) have run dry (God forbid) but the system is still delivering the header tank fuel for a few minutes, most people would not describe this as a system that is unported.   

Charlie  

I’ve not heard of this being a problem in the 701. I built the fuel system in my 701 following the Zenith drawing. A basic description is it’s a fuel tank in each wing, each line goes to the water separator at the system low point. From there a single line runs forward to the engine. No crossfeed, no L or R tank selector in the cockpit.  In the event one tank’s outlet has no fuel covering it, for whatever reason, the fuel from the other tank feeds the engine. If I ever find myself in a situation where I’m flying with only one tank with any fuel in it, and that tank is so low on fuel I uncover that tank’s port due to uncoordinated flight, then I suppose I will be dealing with a situation I created much earlier in the flight due to a lack of good judgement.

Jim,

Well said!

I have 300+ hours on my 701 with a cont C85, gravity fed, standard Zenith gasolator and fuel valve, no issues. I’ve been down to only 3 gallons between both tanks and did not have any starvation problems during turns. 

Is anyone using this header tank system designed by Skytek Aircraft Services for the 912is?

https://store.skytekaircraft.ca/store/p1/Header_Tank_Assembly_Kit.html

Greg

Greg,

Good question.   You might get a better audience in the 750 forum than in this thread in the Open Forum. 

Charlie 

Greg,

You might post your question in the Rotax section. I know at least one happy flyer who uses their tank with a UL Engine. I fly behind a UL also, but have yet too see a need for me to install a header tank. 

Ralph

Forgot to add as requested in the topic kickoff post, I fly behind a carbureted engine with a fuel return line (as required by Rotax).

I plan to use the Skytek tank, mounted on passenger side.  Continental 200A engine.  I think 750 STOL builder David Beaulieu used the Skytek tank with his UL engine.

RSS

New from Zenith:

Zenith Planes For Sale 
 

Classified listing for buying or selling your Zenith building or flying related stuff...

                                                     

Weather Maps


Custom Instrument Panels
for your Zenith
:

Custom instrument panels are now available directly from Zenith Aircraft Company exclusively for Zenith builders and owners. Pre-cut panel, power distribution panel, Approach Fast Stack harnesses, Dynon and Garmin avionics, and more.


Custom Upholstery Kits for your Zenith Aircraft:

Zenith Vinyl Upholstery Kits


Zenith Apparel from EAA:


Zenair Floats


Flying On Your Own Wings:
A Complete Guide to Understanding Light Airplane Design, by Chris Heintz


Builder & Pilot Supplies:

How to videos from HomebuiltHELP.com

Developed specifically for Zenith builders (by a builder) these videos on DVD are a great help in building your own kit plane by providing practical hands-on construction information. Visit HomebuiltHelp.com for the latest DVD titles.

Aircraft Insurance:

 
 

West Coast USA:

Transition Training:

Pro Builder Assistance
 

Pro Builder Assistance

Aircraft Spruce & Specialty for all your building and pilot supplies!

© 2019   Created by Zenith.Aero.   Powered by

Badges  |  Report an Issue  |  Terms of Service