Approved pipe joint compounds
Shellac compound
No.1 get a gas fitter to do so no such thing as diy gas work. No.2 if really stuck use gas type thread tape (yellow)
pipe
Most codes do not allow Galvanized piping/fittings on gas piping. I have used galvanized pipe/fittings on exterior gas piping before in the state of Michigan but other states do not allows this. Check with your local code authorities.
Yes, wherever there is a joint between 2 pipes, use exhaust sealant to prevent a bad seal between the pipes, which will prevent it blowing.
Yes, wherever there is a joint between 2 pipes, use exhaust sealant to prevent a bad seal between the pipes, which will prevent it blowing.
You can use pipe thread sealant aka "Pipe Dope" you can get this at most hardware stores.
it is a gas
Absolutely Not!
Because that is what is used for gas.
You should use black pipe -- Galv. pipe will flake off inside of pipe
No.
yes. Hybrid cars are a mixture of gasoline and electicity. So, you can use either, OS it has a gas pipe