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Fuel Valve

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Carsten H.
(@carl)
Estimable Member
Joined: 4 years ago
Posts: 124
Topic starter  

I was looking for info on the makes and specs on our -2 &-3 fuel valces. I know I've read several discussions about servicing in the forum. Yet a search of "tech support" and forums only produces one (1) entry dealing with the difference between 1/2" & 3/4" valve.


   
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Will Ware (Webmaster ISC)
(@stinsono)
Reputable Member Admin
Joined: 4 years ago
Posts: 363
 

Well, in the Tech Resources section of the main site, you will see the Bublup app and the Files/Doc


sections, but have a lot on info on Fuel selectors. 


   
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Will Ware (Webmaster ISC)
(@stinsono)
Reputable Member Admin
Joined: 4 years ago
Posts: 363
 
Posted by: @carl

I was looking for info on the makes and specs on our -2 &-3 fuel valces. I know I've read several discussions about servicing in the forum. Yet a search of "tech support" and forums only produces one (1) entry dealing with the difference between 1/2" & 3/4" valve.

There is only a 3/8” valve used with the 150hp engine, and a 1/2” line for the 165hp engine. Not familiar with any 3/4”.


   
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Carsten H.
(@carl)
Estimable Member
Joined: 4 years ago
Posts: 124
Topic starter  

Yes of course.  I meant 3/8.

Great video on lapping. 


   
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lawheelock
Prominent Member
Joined: 17 years ago
Posts: 774
 
Posted by: @carl

I was looking for info on the makes and specs on our -2 &-3 fuel valces. I know I've read several discussions about servicing in the forum. Yet a search of "tech support" and forums only produces one (1) entry dealing with the difference between 1/2" & 3/4" valve.

 

Carsten,

Both the 3/8" fuel valve for the 150 hp applications and the 1/2'" fuel valve were originally made by the Imperial Brass Company.  They also made the original primers. 

Imperial discontinued the fuel valve production and buried their remaining stock after being sued by the lawyers involved in the crash of the VariEze just recently purchased by John Denver in which he lost his life.  While the fuel valve had nothing to do with the fact that Denver did not understand the fuel system and did not check fuel before his flight, the lawyers always go after where they can reap big bucks in fees, irregardless if the future detrimental effects on the future of legitimate replacement parts.

The replacement fuel valves that Univair has are made by Allen.  But, the 1/2" version is NOT approved for any engine larger than the 165.

This Stinson site has been so spread to other mediums rather than a single ISC site accessable to all, I do not seem to have access to the site that has the video on lapping the valve.  I have long advised folks how to do that and cautioned them about removing the valve due to the likelyhood of damaging the lines and fittings and the fact that it is just as easy to service the valve in place as it is to remove and install it. I have done mine several times over the last 53 years, but now I need to do it again.  Leaving the fuel valves not operated over long periods of time seems to help in making them difficult to turn even when they have been properly lapped and lubricated.  What most people do not realize is the fact that it is the close fit of the valve cone in the valve body and the compression spring that keeps them tight, that prevents leakage, not the leather seal or o rings on the shaft. 

 

Larry Wheelock

 

Larry Wheelock, A&P/IAStinson 108 N584LW 180 LycTexas in Winter; Indiana in Summer


   
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Carsten H.
(@carl)
Estimable Member
Joined: 4 years ago
Posts: 124
Topic starter  

Thanks Larry, I agree. I've kept mine operating freely over the many years by installing a thin washer between the handle and the grommet on my panel.  It provides just enough tension to allow the cone to turn easily. It has started to seap, from the shaft presumably and uts time for an overhaul. 


   
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Will Ware (Webmaster ISC)
(@stinsono)
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Joined: 4 years ago
Posts: 363
 
Posted by: @lawheelock

This Stinson site has been so spread to other mediums rather than a single ISC site accessable to all, I do not seem to have access to the site that has the video on lapping the valve.  

Larry Wheelock

 

Larry, If you have access to post here, you also have access to all the pages under the Tech Resources of this site. The lapping video I did is simply a link to Youtube so there is no problem with that either. 

This post was modified 2 years ago by Will Ware (Webmaster ISC)

   
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Charles L Gruby Gruby
(@charlesgruby)
Trusted Member
Joined: 6 years ago
Posts: 72
 

Will, I'm having difficulty replying to your post regarding thee possibility of me making a new fuel valve washer, so I'm posting my reply here. I'm such a computer illiterate, I've only been associated with them since making printed circuit boards on one of the very first built by MIT back in 1955.

I got your pictures with the measurements. I have a bag full of brass bushings made for elevator bushings on a home built, but it turns out the inside diameter is a bit proud 0.989" versus your 0.838". That's a bit much for your purposes. I've got to come up with some brass stock and will proceed from there. Let me know the thickness when you get it. If anyone has some brass laying around, send me a chunk.

Chuck Gruby
Stinson 108-2 NC9502K
Petal, MS


   
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Will Ware (Webmaster ISC)
(@stinsono)
Reputable Member Admin
Joined: 4 years ago
Posts: 363
 

@charlesgruby

 

Thanks for the help Charles! I did find a oil pan plug gasket that may be close with a little filling. I will keep you posted.


   
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Charles L Gruby Gruby
(@charlesgruby)
Trusted Member
Joined: 6 years ago
Posts: 72
 

I've found a source for some brass stock and have ordered it. I can use it for other projects if you don't still need a washer. Besides, I need to use that lathe.

Chuck Gruby
Stinson 108-2 NC9502K
Petal, MS


   
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Will Ware (Webmaster ISC)
(@stinsono)
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Joined: 4 years ago
Posts: 363
 

I will gladly take one if Yu can make it! I forgot to take the thickness measurement yesterday darn it!


   
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