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A petcock is a fuel swich on the petrol tank that can turn the flow of petrol to the engine on and off. It usually has a on, off and sometimes reserve setting.
A full tank of petrol is worth as much as a full tank of petrol in any other car.
Depends on the size of said tank. Or if you are talking about a military tank then it depends on which tank you are talking about.
You would need to use alternative method of checking the fuel level, such as dipping the tank.
You need to "drop" the tank.
The petrol is pumped from the tank to feed the engine.
depends how much petrol is in the tank
35 l
Gasoline expanse and contracts with temperature.
the only safe way is to drop the tank. ( DO NOT DRIVE THE CAR OR START THE ENGINE WITH PETROL IN THE FUEL LINES EVERY THING FROM THE TANK TO THE PUMP WILL NEED TO BE CLEANED. If you had he car towed back home without starting the engine then removing the tank and draining fuel should do. A lot depends on how much diesel was in the tank when you put the petrol in. How much petrol you put with the diesel before You realised the error and whether you got neat petrol up to the injectors. Its a common error running the engine for a few seconds wont matter to much but you don't want petrol in the injector pump at all. If you no very little about mechanics let a professional do it for you as mistakes can be catastrophic.
18 gallons
They vary-we can only answer with details on the vehicle.