Filling holes in firewall.
 

Can holes in firewall be safely filled without removing the gas tank?
TIA
Dick

Re: Filling holes in firewall.
 

Empty it, fill with water to the top. The drain and blow dry with just air when complete.
Remember vapors are as bad/word than liquid to explode.

Re: Filling holes in firewall.
 

Drain after holes filled?
Thanks
Dick

Re: Filling holes in firewall.
 

Yes when welding, sparks and heat completed
Just remember that half full could still have vapors…..so full!
Also the carb and lines have gas
It is not foolproof so travel carefully at own risk

Re: Filling holes in firewall.
 

Engine in hospital no worries there
Thanks
Dick

Re: Filling holes in firewall.
 

Another way to deal with a fuel tank is to drain it and either fill it with inert gas or put a bunch of dry ice in it just before starting to weld. Fuel needs air to make a mixture that will ignite. If the car is all together then the whole fuel system needs to be considered since it is all related to the firewall as well. With a sediment bowl and carburetor right there, there are a lot of combustibles.

Re: Filling holes in firewall.
 

Re: Filling holes in firewall.
 

Nothing but a fuel valve, fuel line, and a sediment bowl attachment just above the heater carry through inside the cab if so equipped. The sediment bowl, carb feed line, and carburetor are on the engine side in that right side area. It just depends on where the unwanted holes are. If the holes are on the left side then there is less chance of problems. Welding stuff up throws a lot of sparks and they go everywhere if using MIG. I gas weld myself but that little torch puts out a pretty good sized flame. I wouldn't want all that fuel system stuff even close to where I'd be welding. After the welding then the grinding begins and that will throw sparks everywhere.

A lot of these old cars have had aftermarket heater set ups installed and some of them end up with a lot of extra holes they don't need.