Join Date: Sep 2007
Location: North Florida
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Re: Fuel tank drain
Given your particular install, I think a drain on the bottom of your tank is a sound alternative (as long as it's not proscribed by law or regulation.)
The bad news is that it's gonna be a bitch to install one properly.
Unless your tank is one of the low-carbon stainless alloys, welding is going to open you up to other risks (read up on stainless weld decay.) If you had an aluminum or steel tank, you'd be far better off if you wanted to weld.
Going for a mechanical seal is going to require you to access the inside of the tank, which from your description would probably mean you'll need to pull the tank (and maybe even cut a port in the top of the tank.)
I gotta admit, I'm firmly in Andrew's corner on this one in wondering if the risk merits the amount of effort it will take to mitigate...
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'85 BYB Vagabond 39