<VV> Fuel Seepage at Carb Inlet Fittings

[Frank DuVal]

If it is vibration, can you guarantee the remaining section of steel 
line will not also resonate and loosen?

Over the years I have worked on many Corvair motors. Most did not leak 
at the carb nut once I tightened them. I did as you you, tighten the big 
nut with a 1" open end wrench to the carb and then while holding that 
wrench so the big nut  can not move, tighten the fuel line nut with a 
flare nut wrench. But once in a while one would come back wet. Then I 
would try new gaskets, etc. In severe cases, I would bend (slightly) the 
steel line to make sure there was no residual torque on the nuts to make 
them loosen.

I always removed any rubber flexable lines I found inside the engine 
compartment. It just seemed to be more places to leak from. Because it 
was just hose and hose clamps, not specially made flex lines. Check 
places that sell racing equipment, such as Summit.

Frank DuVal

Mikeamauro at aol.com wrote:

>After 36 years of trying all kind of things to make the stock set up work,  
>I'm ready to take drastic measures. Here's what I figure: vibration, set up 
>down  the steel fuel lines, no matter how firmly the inlet nut is tightened,  
>eventually loosens the nut. Then, the threads, being basically an inclined  
>plane, once loosened, back out in the direction henceforth from which  installed. 
>I've tried all the regular, as-well-as irregular stuff: 1st  tightening the big 
>not (to carb), and then the fuel line fitting (while backing  up the big 
>nut); thread lock compound; Clark's deeper carb inlet nut; stock  fiber 
>washers...nearly stock, but copper-clad washers...and aluminum washers. If  I've missed 
>anything, please let me know, but all stated before is to hopefully  hold back 
>any standard "have you tried this, and have you tried that"  comments. What's 
>next: because my hypothesis is the inlet nut is backing out  ultimately due 
>to vibration, I'm going to insert a section of flexible  fuel line in the steel 
>lines leading to each carb. Questions: has anyone done  this? And, I want to 
>use braided fuel line (preferably Teflon  lined) designed and rated 
>specifically for fuel line service in an engine  compartment. Can anyone state a source 
>for flexible fuel line meeting these  specifications?
> 
>Much obliged,
>Mike Mauro
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