A tanker is used to transport the Petrol from storage tanks to the petrol station.
Tank, Tanker or a Canister.
The flow of petrol
Most likely, this is to discharge any static electricity that the tanker may have accrued during its journey. Such static can be dangerous because it may cause the petrol to ignite; therefore, the wire 'grounds' the tanker (i.e. it allows the electricity to pass harmlessly into the ground) and removes this threat.
It is a ship known generally as a tanker.
Because even if there's a slight static charge in the tanker, it could ignite the petrol and explode. If it's connected to the ground by a wire, then all the static charge in the truck is removed (ie grounding the truck).
I am not sure, I wrote tanker.
It depends from where your are coming.
How much does a gas tanker truck cost?"
The oil company who provided the gas/petrol. However, the police would probably guard the tanker until another driver arrived.
Depends on the model of the car
Sure, just change the tank and all the plumbing. If you were trying to re-purpose the tank, no, the tank has to survive a 300 psi pressure test