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Old 04-07-2011, 09:37 PM
instructor_bill instructor_bill is offline
 
Join Date: Jul 2009
Location: Petaluma, CA
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Default Thinking about using a bulkhead fitting

I'm thinking about adding a bulhead fitting to the fuel line at the fuselage exit (might you call that the entrance.)

Has anybody done this? Did you use a straight or 90 bulkhead fitting?
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RV7 SB in construction
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Last edited by instructor_bill : 04-07-2011 at 09:41 PM.
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  #2  
Old 04-08-2011, 07:08 AM
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flion flion is offline
 
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Location: Flagstaff, AZ
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Default

Firewall? Definitely. Wing side? I don't think so. On the -6/6A, anyway, having that little extra 'give' that you'd lose with a short fitting-to-fitting connector makes a big difference in connecting the tank-to-fuselage lines.
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  #3  
Old 04-08-2011, 07:14 AM
fehdxl fehdxl is offline
 
Join Date: Mar 2005
Location: Bellevue, NE
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Default

Quote:
Originally Posted by instructor_bill View Post
I'm thinking about adding a bulhead fitting to the fuel line at the fuselage exit
Me too, just not quite at that step in the build process yet.

Quote:
Originally Posted by flion View Post
...having that little extra 'give' that you'd lose with a short fitting-to-fitting connector makes a big difference in connecting the tank-to-fuselage lines.
What if one used a flexible hose? Stainless braided for example?

Best,

-Jim
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  #4  
Old 04-08-2011, 07:25 AM
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B Cunningham B Cunningham is offline
 
Join Date: Jan 2005
Location: Louisville, KY
Posts: 244
Default Andair firewall passthrough filter w checkvalve

Would you be interested in this? I'd like to sell it.
https://picasaweb.google.com/BenCunn...eat=directlink
Cut the appropriate size hole in the firewall, rivet in the passthrough. Easy disconnect with a 70 micron reusable filter. Andair designed and manufactured. (You wont find it on their website - it was fabricated for an alternative engine manufacturer, but you can ask them about part number BLF375#1) The list price was $195, I'll sell it for $95 + shipping.
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Old 04-08-2011, 07:43 AM
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Walt Walt is offline
 
Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
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As Pat said, with only approx. 6" between the fuselage and the tank this would be a bad idea, a straight line would provide no slack for the relative movement between the tank and fuselage. I suppose using a 90d fitting on both the tank and fuselage would work then you could have a loop in the line. To me this is an "improvement" looking for a problem.
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EXP Aircraft Services LLC
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Old 04-08-2011, 10:54 AM
instructor_bill instructor_bill is offline
 
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Location: Petaluma, CA
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Default there will be some sort of loop

It won't be a straight shot from the fitting to the tank anyhow. I'll be adding an andair wing root gascolator in either wing.

so there will be a small loop from the bulkhead fitting to the gascolator, and another from the gascolator to the tank. I'm aware this may add a potential source of failure, but I have a redundant system with one in each wing.

if I have a failure, it most certainly won't be in both wings at the same time.
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