Re: Firewall welding
You can drain the gas and put dry ice in it. The CO2 from the evaporating dry ice will displace any oxygen in the tank and there will be nothing to ignite. Along with the sheet metal barrier between the tank and firewall, lay a cloth soaked in water across the top of the cowl covering over the filler neck as a back up measure.
If you are working on an early '30, this is a common problem. In mid '30, they added reinforcements to the back side of the firewall where the hood rod brackets attach.
Chris W.
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