• Gas tank fabrication is not an easy process, and it requires a lot of measuring and cutting. However, if you're going to make a custom gas tank, a task which is sometimes necessary for a motorcycle, then there are some definite tools you're going to need on hand with which to do it.
  
  

Welding Torch

• To create a custom gas tank out of metal, you're going to need a welding torch. Once the tank is shaped and the edges are being held together, you use the torch to melt those edges together and bond the seam. This will most likely be the last step in the gas tank fabrication process and it will come last unless you're using the torch to cut out gouge metal earlier on in your fabrication.
  
  

Hammer and Anvil

• While it might seem like something from the days of medieval blacksmithing, a hammer and anvil can come in very handy when you're fabricating a gas tank. If you need to pound out a crease in the metal, or make sure that a given area is flat, you can use the hammer to pound it. The hammer is useful for removing dents that you might make accidentally, and unbending curves that you may not want in the metal.
  
  

Measuring Tape

• A large part of any fabrication process deals with measuring. Since a gas tank will not be flat, but rather curved, it might be a good idea for you to have a tape that is free moving rather than rigid so you can bend it around curves to take exact measurements. Other useful tools are markers or gel pens, since they will let you make marks on the metal to guide where you'll need to cut.