Persistent Leaky Fuel Shutoff Valve

marc silva said:
I rebuilt my original valve 3 times and it still seeped. The carb had the original ball type float valve. I bought a new tank shut off valve from who I can’t recall. Still seeped. I put in a new Viton needle and seat float valve and no more leaks. That was 5 or 6 years ago. I haven’t driven my car for a couple months and the gas is ON right now in my garage with NO leakage! I just walked out to check before I wrote this reply and it’s dry as a bone! And the tank is 3/4 full. I don’t think the valve design is a for sure never seep design. Back then your garage floor was gravel. At least my grand fathers was. Boy I miss that oil gas dirt smell!!
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I forgot about the Viton needle seal. Sounds like a great idea. I will try that as well.

I have been trying to stop the seepage ever since I got the car: have rebuilt the valve and carburetor. Carburetor runs fine except for the seepage. And the main shutoff after rebuild works well for a few months, then becomes stiff and seeps. I trust this ball valve with the nylon seals will fix it.
 
I ended up installing option one. I didn't have to shorten the fuel line between valve and firewall. And I positioned the valve with slightly shortened handle so it would not hit the metal channel under the speedometer cluster.

Here is the final installation.
 

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My coupe sat since the early 60's. I got a packing from Macs replaced it and 3-1/2 years later no leaks. I've turned it off/on at least 200+ times.
 
Looked at it this morning. Dry and no drips. Ball valve is easier to turn and moves as smooth as silk.

Celebrated with my wife on a 60 mile tour this afternoon. Temperature outside hit 90 degrees and cruising for many miles at 50 mph she did not overheat (previous problem fixed).

Life is bliss....
 
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