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Fuel Selector "Both"

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New Member
Joined: 3 months ago
Posts: 2
Topic starter  

Hello all. Im a new Stinson 108-3 ( 0-470-R) flyer from Canada and new to this group. Im fumbling through trying to learn as much as possible and figured I would just go ahead and ask. What is the reason for not having a "BOTH" option on the fuel selector? Ive owned a dozen aircraft over the years and this is the first ive seen it. Would really like to change it. Thanks in advance


   
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Reputable Member
Joined: 17 years ago
Posts: 286
 

It is a regulatory requirement. To have a both position, the vent system has to connect both tanks. Probably so they feed evenly?


   
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Reputable Member
Joined: 4 years ago
Posts: 295
 

 Even older Cessna 172's need to be switched to just one tank at altitude and they have a cross over vent line.


   
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New Member
Joined: 3 months ago
Posts: 2
Topic starter  

In my 185, I think the only time I ever moved the selector from both was when I parked on a slope as I didnt want the fuel filling up the lower wing. Ive built a couple Bearhawks over the years that I used "Both" on and neither of them had a crossover vent line. Oh well, thaught id throw it out there in case there was some special reason. thx for the response 


   
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Reputable Member
Joined: 4 years ago
Posts: 295
 

 Regarding the older 172's, it was added to the POH at some point. I actually had the engine quit once cuz I didn't believe that it could happen, but it did. I was only at something like 5000' over the mountains. Still don't know why, but I am a believer now.


   
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Reputable Member
Joined: 17 years ago
Posts: 286
 

CAR 3.446: "Air spaces of tanks the outlets of which are interconnected shall also be interconnected."


   
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(@caseyleehutsongmail-com)
Eminent Member
Joined: 2 years ago
Posts: 29
 

A 3 position fuel valve (Left, Right, BOTH) has been approved via field approval in the past for at least one aircraft. Steve Ruff has one on his aircraft and he has a field approval for it. The 337 should be in the files section on this site if you are interested in doing the same.


   
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